Top Circuits Page 171
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It`s a very useful circuit which when installed on your car gives the voltage of you car battery in a LED dot display form. The meter circuit is based on four comparators made of quad op amp LM324. The inverting inputs of IC are kept at at reference voltages....
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There are currently several nice ICs available that contain a nearly complete receiver. This project is a complete FM receiver circuit with excellent receive and sound qualities. The only disadvantage of using this IC TDA7021T from ST-NXP Wireless, from the....
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MM5314 a monolithic MOS integrated circuit that utilizes P-channel low threshold, enhancement mode and ion planted, depletion mode devices which has features such as internal multiplex oscillator, fast and slow set controls, single power supply, 7-segment....
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This 860 MHz Phase Locked Loop (PLL) oscillator circuit is for 1200 MHz transverter`s local oscillator with 435MHz rigs. The oscillator circuit uses PLL synthesizer IC`s of Toshiba for PLL circuit. TC9122P is easy to use preset counter for determining....
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This MOT`s LSI is very suitable for designing ham rigs` VFO, which has 4 digit BCD preset counters from 3 to 3999. And also there is standard Xtal frequency oscillator and preset dividers. This LSI`s input nodes are pull down in the LSI. You should supply 5V....
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Here is an infrared remote control tester circuit that can be made without spenting much money. This IR tester build around an infrared reciever module TSOP1738. We can observe the remote control state by listening to the buzzer sound. The circuit is very....
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Most of the peripherals that interface with PC uses USB port. The computers power supply circuit of SMPS will be designed to maintain constant power to all computer parts only. however we connect external peripherals to PC that requires significantly large....
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The circuit comprises a 555 IC as the core. This is designed to work as an astable multivibrator. When we connect a positive 9 volt to pin no. 8, the circuit will produce a sound through speaker. But here the connection to pin 8 goes through the transistor....
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Here`s the circuit diagram of a four RF stage FM transmitter. The stages are, very high frequency (VHF) oscillator built around a HF transistor BF494, a pre- amplifier built around transistor BF200, a driver transistor 2N2219 and a power amplifier using....
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Here is a simple low power audio amplifier circuit that can produce a power output of 1W. This mono amplifier circuit is build on LM386 IC which works great on low voltages even below 9V. This low voltage amplifier is useful to amplify weak sound signals....
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Here is a high sensitive touch plate circuit using NE555 which turns on a buzzer when anyone touches the metal plate or by hovering his hand over the plate. From the previously published touch control switch circuit, this circuit has an advantage of high....
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This circuit diagram of digital clock uses six common anode seven segment displays to show the time. It needs neither micro controllers or PIC for it`s operation. It`s a MM5314 IC driven digital clock operating at 50 Hz or 60 Hz, and 12 or 24 hour display....
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Here`s the circuit diagram based on PIR motion sensor module BS1600 (or BS1700) that can be used for security lighting in power saving mode. (If you could not found one in your local store, buy PIR motion sensor online). The special advantage of this motion....
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The circuit diagram shows a timer 555 based rain sound generator. The circuit requires a 9V dc power supply and can be fed from a 9V battery. The loud speaker for producing sound is of 0. 5W 8ohm speaker. The circuit will readily generate a rain like sound....
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This TDA2030 amplifier circuit is ideal for driving low frequency subwoofer speakers in home theater systems. The TDA2030 is a monolithic integrated circuit intended for use as a low frequency class AB amplifier. This TDA2030 amplifier design needs dual....
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The circuit diagram shown here is a very sensitive wireless relay switch that can be used to control the working of home appliances like flush system, hand dryer or else. The wireless switch described here needs no remote control for its working. You only....
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The circuit diagram shows a powerful stereo amplifier which can deliver a power of 22W. It is built around popular single-chip audio power amplifier TDA1554Q (IC1). Here it is configured as two 22W stereo bridge amplifiers. Listening to songs stored in....
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This is a low cost FM booster circuit to receive far away fm stations clearly on your radio in your local area. The circuit diagram of FM booster consist of a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. The output of the....
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Circuit The picture shows the circuit diagram of a rotation sensor that can turn on a device like motor or buzzer while the circuit assembly rotates. The circuit is based on basic 555 timer operation. ..
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Here a simple circuit diagram of duophone that allows you to access two telephone line through a single telephone set. The conversation through each line will entirely private when the conference switch in the dual phone is off. So this duophone circuit has....
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Circuit The circuit diagram provided is a triac - diac electronic fan regulator that would reduce your power usage of electric fans even in slow speeds. A normal resistor-inductor fan regulator heats up to waste eneegy when the fan is running with lowers....
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This circuit diagram is a UM66 based touch sensitive musical bell. The circuit is built around CMOS IC CD4011 and popular melody generator IC UM66. The circuit contains a pair of touch plates. When these are bridged by hand for a moment, the um66 starts....
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Circuit This circuit was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this circuit monitors the output of the TV`s FM detector IC via a shielded lead. To initially calibrate the meter, adjust....
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Circuit This circuit diagram of UPS is designed to use with a cordless telephones that cannot be operated during power failure. Since the ups is only meant for telephone, it`s output power is limiter to 1. 5W. This ups circuit is economical and can be....
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Stepper motors find lots of applications in process control, machine tools and robotics. Especially in robotics and process control, bit is necessary to control the stepper motor from a remote place. Here you will get the transmitter and receiver circuit....
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Here is a very low-cost protection circuit to save your electrically operated home appliances, such as TV, DVD player, refrigerator, and other instruments during sudden tripping and resumption of mains supply. Appliances like refrigerators and air....
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Here is a very simple triac tester circuit which can be used for testing of SCRs as well as triacs. The circuit could even be used for checking of pnp and npn transistors. The circuit works on 3V DC, derived using a zener diode in conjunction with a....
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This article was originally published (in a slightly modified form) in the QST magazine, December 1998 and January 1999, and in the Radio Amateur`s Handbook, 1999. Visit the American Radio Relay League for information on these publications, and a world of....
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The heart of this circuit is a crystal oscillator. A 10MHz crystal is used to produce highly stable carrier frequency. The sound signal from the condenser mic is amplified by the amplifier circuit consist of transistors Q1, Q2 and Q3. The amplified audio....
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AC to DC switching power adaptor circuit with maximum output power of 90W. Switching power supply is built using a high voltage power switching regulator IC MC33374 and some other additional components. The MC33374 IC is a monolithic high voltage power....
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Many electronic devices depend upon the shape of the signals. It is very simple to produce square wave signals from sine signal, but doing vice versa is quite difficult. In case of static square wave-to-sine wave converter circuit diagram, in low frequency....
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Here`s a circuit diagram of automatic muting for audio systems using IC LB1403. The signal from pre-amplifier such as LA3160, LA3161 or HA1032 is connected to the base of the amplifier transistor BC548 (T1). Variable resistor VR1 is used to control the gain....
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This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1. 5 sec by varying the preset VR1. ..
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The circuit presented here is that of a digital fan regulator, variable to provide five speed levels as catered for in ordinary fan regulators. The circuit of ceiling fan controller makes use of easily available components. An optional 7-segment display with....
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Here is the circuit of a fluid level indicator which shows each level in meaningful English letters. The circuit presented here using seven segment display to display the letter E for empty, L for low, H for half, A for above average, and F for full tank.....
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This be LED VU Meter by IC LM3914 circuit show with LED convenient for the stereo or sound all signal. This easy circuit again because use IC LM3914 show get 10 the level. Build easy because use the integrated circuit just one and the price is inexpensive.....
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The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the....
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This post shares a proximity detector circuit comprising mainly NE555 IC. This circuit can be used for burglar alarms based on beam interruption, with the added advantage that the transmitter and receiver are housed in the same enclosure, avoiding any wiring....
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A TTL logic probe is an indispensable tool for digital circuit troubleshooting. Various methods can be used to design a logic probe. The most common designs employ opamps, logic (OR, NOT, XOR) gates, and transistors. The circuit presented here uses NAND....
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The circuit, is a comparator, can measure with step of 1Volt, the voltage of battery of car. The clue of voltage become after comparison of voltage of battery, that is applied in the inverting inputs of amplifiers, with voltages of reference that are....
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This circuit uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that senses....
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The main problem with the design of stereo amplifier with a total bass driver, is that the signals of left and right channels, sooner or later, are summarized. As a result of merely adding up, the separation between channels is reduced to a minimum and....
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Here, it is a diagram of an Car audio active loudspeaker. The LF353 of, National Semiconductor. For Best Results using NE5532, is going to split audio signal into three bands (Active Filter). SANYO`S LA47536 is going to amplify these signals. In stereo mode,....
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The circuit of active shortwave antenna presented here boosts weak shortwave signals so that these can be heard with enhanced clarity over a shortwave receiver. Further, the receiver doesn`t require any physical connection as its placement in the vicinity....
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This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is....
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Both halves of the circuit are identical. Both inputs have a dc path to ground via the input 47k control which ought to be a dual log type potentiometer. The balance control is a single 47k linear potentiometer, which at middle modification prevents even....
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The RCA-83 rectifier makes use of 5VAC for the filaments. The heaters for the 5687 tubes are provided from a full bridge of MUR860 diodes, followed by 5 x 10, 000uF Elna caps. 830mA of current regulation is supplied using a LM317 regulator plus a 1R5....
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This simple mosfet power audio amplifier circuit, with TL071C and 2 mosfet power amplifiers can deliver up to 45W on 8 ohm. This schematic is based on Siliconix application and is based on variations of voltage on the 2 resistors serial inserted on the....
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This is a aerial achievement low babble 500mW amplifier / booster for all low ability FM transmitters such as BA1404, BH1417, BH1415, 433MHz transmitter modules, etc. The amplifier dent is an chip ambit absolute assorted transistor stages and all added....
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This Chip from TI is simple to accommodate into your designs and this band-aid is acceptable for assembly of lighting gadgets, actuality a constant affection and anticipated achievement is calmly obtained. The absolute ambit consists of the ascendancy IC,....
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It is not the purpose of this folio to accommodate a abundant account of the IC`s acclimated by this circuit. If you appetite added advice on this accountable amuse accredit to the Flip-Flop Made With A LM556 Timer Chip folio in the assorted circuits area of....
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In appliance that appeal for aerial current, Nicad (NiCd) rechargeable array still has the angry achievement compared to NiMH and Lithium battery. The charger ambit actuality is acute in the way it handle the amiss polarity of the array placement. The core....
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This Do-it-yourself lightning detector ambit can be a abnormally acute changeless electricity detector which can accumulation an aboriginal admonishing of abutting storms from inter-cloud acquittal appropriately above-mentioned to an earth-to-sky....
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This is a aerial affection ability accumulation with a continuously capricious stabilised achievement adjustable at any amount amid 0 and 30VDC. The ambit additionally incorporates an cyberbanking achievement accepted limiter that finer controls the....
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C1/C2`s working voltage ought to be elevated to 25V in the event you decide to go with a 12V power source. Rule of thumb: the operating voltage of capacitors are at least double the supplied voltage, in other words, if the power source is 9 Volt, your....
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Another adjustment of application opamps to adapt a ability accumulation is apparent below. The ability agent requires an added ambagious to accumulation the op-amps with a bipolar voltage (+/- 8 volts), and the abrogating voltage is additionally acclimated....
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This Digital Alarm Speedometer Circuit. It allows us to appraise the acceleration of any article moving, abnormally cars and added vehicles. The acceleration is affected in kilometers per hour (KPH). Its affectation has three digits. This alarm works with....
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This assemblage was advised for amateurs owning an old accumulating of vinyl recordings and absent to accept it digitally remastered into a claimed computer. Or sometimes they would accept to an old, invaluable, LP accumulating through their avant-garde....
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The article "Creating a Line Follower Robot with AVR [Censorship]" is a continuation of Line Follower Robot article with a new AVR ATMega8535 samapai phase Li..
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This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op-amp MC1458 and LM 380. The two op amps inside the MC 1458 are used to produce square and triangular waves. LM 380 is....
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The High Power Amplifier has great advantages are 5000W ultra-light, high-power audio amplifier, without switching-mode power supply. This ambit is of an 2 x 2, 500W RMS Stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof....
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This ambit is of an 2 x 2, 500W RMS Stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof shows a channel, and the ability accumulation that it assists to the two channels. The audio a..
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A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer. A single pole double throw sitch is used to switch between inject and trace modes. The....
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wireless FM transmitter or often called fm transmitter uses 2 transistors in this article uses 2 transistors 2n2222. If the fm transmitter is in use voltage supply of 9 volt battery and use an..
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Many low pass filter circuits for subwoofer are given here and this can be simply another one. The circuit given here using the opamp TL062 from ST Micro electronics. TL062 is twin high input impedance J-FET opamp that has very low power consumption and high....
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The series of light switches this time slightly different from the voltage of work. The series of light switches can work directly on the AC power network. Light switches are using the main component of TRIAC and LDR. The circuit is very simple and the....
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The pressure sensor (MPX4100)MPX4100 is a pressure sensor that is equipped withsignal conditioning circuit and temperature calibrator makes this sensor stable against temperature changes. For this sensor measurement accuracy using micro-machine techniques,....
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The values of LM56 Thermostat project Circuit diagram of R1, R2 and R3 for the points of travel, VT1 and VT2 can be determined using the subsequent equations. This thermostat of electronic circuit with IC LM56 diagram what simple project, you can use as....
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To resolve SSB or CW, a BFO signal may be coupled into the intermediate frequency amplifier. In these circumstances, the BFO has to operate near the intermediate frequency of the receiver, for transmissions of all frequencies. So with a BFO of this type,....
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The article "Creating a Line Follower Robot with AVR [Censorship]" is a continuation of Line Follower Robot article with a new AVR ATMega8535 samapai phase Line Follower Robot block diagram. In the article "Creating a Line Follower Robot with AVR Part 1....
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This can also be called a poor man`s hearing aid because it can be constructed from some low cost components although its performance is not comparable to that of commercially available sophisticated hearing aids, still it can serve the purpose well for....
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Circuits of this kind are intended to drive LED Arrays in order to create more visibility and conspicuity when a vehicle is stopped or stopping. This circuit, in particular, will emit a visual alerting signal of 4 short flashes, followed by a steady on light....
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In rainy seasons, it is very annoying that wiper of your car wiping instantly all the time. Have you ever think of speed control of the wiper. There are wiper control modules available on the market but most of them are costly. So here is an automatic wiper....
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This simple pc scope probe is nothing more than a fet follower. It has a high input impedance and a low output impedance tomatch a mic or line input socket on a pc or laptop. This means it is then practical to examine waveforms under test, for example logic....
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Unplugging or re-connecting equipment to the serial COM or PS2 connector always gives problems if the PC is running. Even if you only need to swap a mouse or changeover from a graphics keyboard to a standard keyboard. The chances are that the connected....
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As we activate to adore those apathetic bleared canicule of summer, the best important affair on best of our minds is how to accumulate air-conditioned during those hot days. For some of us that agency axis up the old air conditioner and sipping on a nice....
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Quiz-type game shows are increasingly becoming popular on television these days. In such games, fastest finger first indicators (FFFIs) are used to test the player`s reaction time. The player`s designated number is displayed with an audio alarm when the....
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Nowadays you can buy white LEDs, which emit quite a bit of light. They are so bright that you shouldn`t look directly at them. They are still expensive, but that is bound to change. You can make a very good solid-state pocket torch using a few of these white....
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The circuit depicted here forms one half of a device that will prove extremely handy when tracing the path of electrical wiring in a building or to locate a break in a wire. The system is based on similar equipment that is used by technicians in telephone....
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In this card there is a constant current source is used to activate the phone. The LM339 is used to detect out of hand and the hand of the condition. There are circuits repeat the same because we have the phone interface 8. When the phone on hand in the....
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This type is commonly used by home users for the Presidency with their PC. UPS to be able to do this type of filtration against power failures and flow management, in addition to design efficient, small size and inexpensive. UPS is the type most often used....
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Wireless FM transmitter circuit Microphone Hi Fi using a model-ready transmitters, this is because the buil-up transmitter module has a transmission capability of a stable and very effective to emit 10 mW RF. so that the target of Hi Fi FM Wireless....
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The servo motor have many utilizes in everything from robotics to puppetry to photography and beyond. These tiny motors can position their output shaft to any position on command and hold that position. Most servos possess a range of motion to about 210....
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If you have an application in which a MOSFET is already used to switch a load, it is relatively easy to add short-circuit or overload protection. Here we make use of the internal resistance RDS(ON), which produces a voltage drop that depends on the amount of....
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Circuit Colpitts Oscillator schematics Circuit Electronics, Colpitts oscillator is very similar to the shunt-fed Hartley oscillator. The principal difference is in the tank circuit. In the Colpitts oscillator, two capacitors are used as replacement coils are....
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This Hi Fi stereo preamplifier circuit is congenital with TDA1054 IC from SGS. TDA1054 is a 16-pin DIL amalgamation and integrates 2 abstracted preamp circuits. It is a low babble preamp with little or no botheration in the building process. The aboriginal....
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This circuit allows audio monitoring of a remote location and so doubles as a room monitor or baby alarm. It canbe run from a 12 Volt battery or mains power supply as shown below. Interconnect uses 3 wires, so multi core cablecan be used; alarm or telephone....
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This audio amplifier designed uses two LM3886 per channel, in parallel circuit, based on the PA100 parallel amplifier detailed in National Semiconductor`s application note - AN1192. This amplifier can deliver about 50W into a 8-ohm speaker and 100W into a....
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As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET....
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The project explains how to make simple AVR High Voltage Programmer using Arduino. It can be used to fix/recovery wrong fused AVR chip....
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The i2c-tiny-usb project is an open source/open hardware project. The goal of i2c-tiny-usb is to provide a cheap generic i2c interface to be attached to the....
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This is a simple and low cost desktop headphone amplifier for the office. The amplifier concept is simple and follows a typical single-ended class A circuit....
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Powered by LM2700 IC, this charger can help you to re-charge your mp3 player, camera, cell phone, and any other gadget you can plug into a USB port with faster rate....
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When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this....
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This project shows you how to build simple flashing light based on IC 555. The 555 has function as clock generator with dutycyle less than 100 and more than 50. The other components are Voltage regulator, 3 power amber LED and passive component like resistor....
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This project shows you how to build a robot voice generator with IC HT8950, a powerful voice modulating IC. The circuit has Robot function, Vibrato function and....
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The aim of the project is to build simple low cost inductance meter. The main parts of the project are IC 555, Transistor, resistor and capacitor....
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When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc....
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Nowadays, just about every house has an outside lamp with a motion sensor. Such a device eliminates the need to feel your way to the front door, and it apparently also scares away intruders. The only problem is that free-running dogs and cats in the....
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Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, it is not difficult to build a data transmission module and connect it to the corresponding header. As....
It`s a very useful circuit which when installed on your car gives the voltage of you car battery in a LED dot display form. The meter circuit is based on four comparators made of quad op amp LM324. The inverting inputs of IC are kept at at reference voltages....
There are currently several nice ICs available that contain a nearly complete receiver. This project is a complete FM receiver circuit with excellent receive and sound qualities. The only disadvantage of using this IC TDA7021T from ST-NXP Wireless, from the....
MM5314 a monolithic MOS integrated circuit that utilizes P-channel low threshold, enhancement mode and ion planted, depletion mode devices which has features such as internal multiplex oscillator, fast and slow set controls, single power supply, 7-segment....
This 860 MHz Phase Locked Loop (PLL) oscillator circuit is for 1200 MHz transverter`s local oscillator with 435MHz rigs. The oscillator circuit uses PLL synthesizer IC`s of Toshiba for PLL circuit. TC9122P is easy to use preset counter for determining....
This MOT`s LSI is very suitable for designing ham rigs` VFO, which has 4 digit BCD preset counters from 3 to 3999. And also there is standard Xtal frequency oscillator and preset dividers. This LSI`s input nodes are pull down in the LSI. You should supply 5V....
Here is an infrared remote control tester circuit that can be made without spenting much money. This IR tester build around an infrared reciever module TSOP1738. We can observe the remote control state by listening to the buzzer sound. The circuit is very....
Most of the peripherals that interface with PC uses USB port. The computers power supply circuit of SMPS will be designed to maintain constant power to all computer parts only. however we connect external peripherals to PC that requires significantly large....
The circuit comprises a 555 IC as the core. This is designed to work as an astable multivibrator. When we connect a positive 9 volt to pin no. 8, the circuit will produce a sound through speaker. But here the connection to pin 8 goes through the transistor....
Here`s the circuit diagram of a four RF stage FM transmitter. The stages are, very high frequency (VHF) oscillator built around a HF transistor BF494, a pre- amplifier built around transistor BF200, a driver transistor 2N2219 and a power amplifier using....
Here is a simple low power audio amplifier circuit that can produce a power output of 1W. This mono amplifier circuit is build on LM386 IC which works great on low voltages even below 9V. This low voltage amplifier is useful to amplify weak sound signals....
Here is a high sensitive touch plate circuit using NE555 which turns on a buzzer when anyone touches the metal plate or by hovering his hand over the plate. From the previously published touch control switch circuit, this circuit has an advantage of high....
This circuit diagram of digital clock uses six common anode seven segment displays to show the time. It needs neither micro controllers or PIC for it`s operation. It`s a MM5314 IC driven digital clock operating at 50 Hz or 60 Hz, and 12 or 24 hour display....
Here`s the circuit diagram based on PIR motion sensor module BS1600 (or BS1700) that can be used for security lighting in power saving mode. (If you could not found one in your local store, buy PIR motion sensor online). The special advantage of this motion....
The circuit diagram shows a timer 555 based rain sound generator. The circuit requires a 9V dc power supply and can be fed from a 9V battery. The loud speaker for producing sound is of 0. 5W 8ohm speaker. The circuit will readily generate a rain like sound....
This TDA2030 amplifier circuit is ideal for driving low frequency subwoofer speakers in home theater systems. The TDA2030 is a monolithic integrated circuit intended for use as a low frequency class AB amplifier. This TDA2030 amplifier design needs dual....
The circuit diagram shown here is a very sensitive wireless relay switch that can be used to control the working of home appliances like flush system, hand dryer or else. The wireless switch described here needs no remote control for its working. You only....
The circuit diagram shows a powerful stereo amplifier which can deliver a power of 22W. It is built around popular single-chip audio power amplifier TDA1554Q (IC1). Here it is configured as two 22W stereo bridge amplifiers. Listening to songs stored in....
This is a low cost FM booster circuit to receive far away fm stations clearly on your radio in your local area. The circuit diagram of FM booster consist of a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. The output of the....
Circuit The picture shows the circuit diagram of a rotation sensor that can turn on a device like motor or buzzer while the circuit assembly rotates. The circuit is based on basic 555 timer operation. ..
Here a simple circuit diagram of duophone that allows you to access two telephone line through a single telephone set. The conversation through each line will entirely private when the conference switch in the dual phone is off. So this duophone circuit has....
Circuit The circuit diagram provided is a triac - diac electronic fan regulator that would reduce your power usage of electric fans even in slow speeds. A normal resistor-inductor fan regulator heats up to waste eneegy when the fan is running with lowers....
This circuit diagram is a UM66 based touch sensitive musical bell. The circuit is built around CMOS IC CD4011 and popular melody generator IC UM66. The circuit contains a pair of touch plates. When these are bridged by hand for a moment, the um66 starts....
Circuit This circuit was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this circuit monitors the output of the TV`s FM detector IC via a shielded lead. To initially calibrate the meter, adjust....
Circuit This circuit diagram of UPS is designed to use with a cordless telephones that cannot be operated during power failure. Since the ups is only meant for telephone, it`s output power is limiter to 1. 5W. This ups circuit is economical and can be....
Stepper motors find lots of applications in process control, machine tools and robotics. Especially in robotics and process control, bit is necessary to control the stepper motor from a remote place. Here you will get the transmitter and receiver circuit....
Here is a very low-cost protection circuit to save your electrically operated home appliances, such as TV, DVD player, refrigerator, and other instruments during sudden tripping and resumption of mains supply. Appliances like refrigerators and air....
Here is a very simple triac tester circuit which can be used for testing of SCRs as well as triacs. The circuit could even be used for checking of pnp and npn transistors. The circuit works on 3V DC, derived using a zener diode in conjunction with a....
This article was originally published (in a slightly modified form) in the QST magazine, December 1998 and January 1999, and in the Radio Amateur`s Handbook, 1999. Visit the American Radio Relay League for information on these publications, and a world of....
The heart of this circuit is a crystal oscillator. A 10MHz crystal is used to produce highly stable carrier frequency. The sound signal from the condenser mic is amplified by the amplifier circuit consist of transistors Q1, Q2 and Q3. The amplified audio....
AC to DC switching power adaptor circuit with maximum output power of 90W. Switching power supply is built using a high voltage power switching regulator IC MC33374 and some other additional components. The MC33374 IC is a monolithic high voltage power....
Many electronic devices depend upon the shape of the signals. It is very simple to produce square wave signals from sine signal, but doing vice versa is quite difficult. In case of static square wave-to-sine wave converter circuit diagram, in low frequency....
Here`s a circuit diagram of automatic muting for audio systems using IC LB1403. The signal from pre-amplifier such as LA3160, LA3161 or HA1032 is connected to the base of the amplifier transistor BC548 (T1). Variable resistor VR1 is used to control the gain....
This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1. 5 sec by varying the preset VR1. ..
The circuit presented here is that of a digital fan regulator, variable to provide five speed levels as catered for in ordinary fan regulators. The circuit of ceiling fan controller makes use of easily available components. An optional 7-segment display with....
Here is the circuit of a fluid level indicator which shows each level in meaningful English letters. The circuit presented here using seven segment display to display the letter E for empty, L for low, H for half, A for above average, and F for full tank.....
This be LED VU Meter by IC LM3914 circuit show with LED convenient for the stereo or sound all signal. This easy circuit again because use IC LM3914 show get 10 the level. Build easy because use the integrated circuit just one and the price is inexpensive.....
The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the....
This post shares a proximity detector circuit comprising mainly NE555 IC. This circuit can be used for burglar alarms based on beam interruption, with the added advantage that the transmitter and receiver are housed in the same enclosure, avoiding any wiring....
A TTL logic probe is an indispensable tool for digital circuit troubleshooting. Various methods can be used to design a logic probe. The most common designs employ opamps, logic (OR, NOT, XOR) gates, and transistors. The circuit presented here uses NAND....
The circuit, is a comparator, can measure with step of 1Volt, the voltage of battery of car. The clue of voltage become after comparison of voltage of battery, that is applied in the inverting inputs of amplifiers, with voltages of reference that are....
This circuit uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that senses....
The main problem with the design of stereo amplifier with a total bass driver, is that the signals of left and right channels, sooner or later, are summarized. As a result of merely adding up, the separation between channels is reduced to a minimum and....
Here, it is a diagram of an Car audio active loudspeaker. The LF353 of, National Semiconductor. For Best Results using NE5532, is going to split audio signal into three bands (Active Filter). SANYO`S LA47536 is going to amplify these signals. In stereo mode,....
The circuit of active shortwave antenna presented here boosts weak shortwave signals so that these can be heard with enhanced clarity over a shortwave receiver. Further, the receiver doesn`t require any physical connection as its placement in the vicinity....
This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is....
Both halves of the circuit are identical. Both inputs have a dc path to ground via the input 47k control which ought to be a dual log type potentiometer. The balance control is a single 47k linear potentiometer, which at middle modification prevents even....
The RCA-83 rectifier makes use of 5VAC for the filaments. The heaters for the 5687 tubes are provided from a full bridge of MUR860 diodes, followed by 5 x 10, 000uF Elna caps. 830mA of current regulation is supplied using a LM317 regulator plus a 1R5....
This simple mosfet power audio amplifier circuit, with TL071C and 2 mosfet power amplifiers can deliver up to 45W on 8 ohm. This schematic is based on Siliconix application and is based on variations of voltage on the 2 resistors serial inserted on the....
This is a aerial achievement low babble 500mW amplifier / booster for all low ability FM transmitters such as BA1404, BH1417, BH1415, 433MHz transmitter modules, etc. The amplifier dent is an chip ambit absolute assorted transistor stages and all added....
This Chip from TI is simple to accommodate into your designs and this band-aid is acceptable for assembly of lighting gadgets, actuality a constant affection and anticipated achievement is calmly obtained. The absolute ambit consists of the ascendancy IC,....
It is not the purpose of this folio to accommodate a abundant account of the IC`s acclimated by this circuit. If you appetite added advice on this accountable amuse accredit to the Flip-Flop Made With A LM556 Timer Chip folio in the assorted circuits area of....
In appliance that appeal for aerial current, Nicad (NiCd) rechargeable array still has the angry achievement compared to NiMH and Lithium battery. The charger ambit actuality is acute in the way it handle the amiss polarity of the array placement. The core....
This Do-it-yourself lightning detector ambit can be a abnormally acute changeless electricity detector which can accumulation an aboriginal admonishing of abutting storms from inter-cloud acquittal appropriately above-mentioned to an earth-to-sky....
This is a aerial affection ability accumulation with a continuously capricious stabilised achievement adjustable at any amount amid 0 and 30VDC. The ambit additionally incorporates an cyberbanking achievement accepted limiter that finer controls the....
C1/C2`s working voltage ought to be elevated to 25V in the event you decide to go with a 12V power source. Rule of thumb: the operating voltage of capacitors are at least double the supplied voltage, in other words, if the power source is 9 Volt, your....
Another adjustment of application opamps to adapt a ability accumulation is apparent below. The ability agent requires an added ambagious to accumulation the op-amps with a bipolar voltage (+/- 8 volts), and the abrogating voltage is additionally acclimated....
This Digital Alarm Speedometer Circuit. It allows us to appraise the acceleration of any article moving, abnormally cars and added vehicles. The acceleration is affected in kilometers per hour (KPH). Its affectation has three digits. This alarm works with....
This assemblage was advised for amateurs owning an old accumulating of vinyl recordings and absent to accept it digitally remastered into a claimed computer. Or sometimes they would accept to an old, invaluable, LP accumulating through their avant-garde....
The article "Creating a Line Follower Robot with AVR [Censorship]" is a continuation of Line Follower Robot article with a new AVR ATMega8535 samapai phase Li..
This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op-amp MC1458 and LM 380. The two op amps inside the MC 1458 are used to produce square and triangular waves. LM 380 is....
The High Power Amplifier has great advantages are 5000W ultra-light, high-power audio amplifier, without switching-mode power supply. This ambit is of an 2 x 2, 500W RMS Stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof....
This ambit is of an 2 x 2, 500W RMS Stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof shows a channel, and the ability accumulation that it assists to the two channels. The audio a..
A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer. A single pole double throw sitch is used to switch between inject and trace modes. The....
wireless FM transmitter or often called fm transmitter uses 2 transistors in this article uses 2 transistors 2n2222. If the fm transmitter is in use voltage supply of 9 volt battery and use an..
Many low pass filter circuits for subwoofer are given here and this can be simply another one. The circuit given here using the opamp TL062 from ST Micro electronics. TL062 is twin high input impedance J-FET opamp that has very low power consumption and high....
The series of light switches this time slightly different from the voltage of work. The series of light switches can work directly on the AC power network. Light switches are using the main component of TRIAC and LDR. The circuit is very simple and the....
The pressure sensor (MPX4100)MPX4100 is a pressure sensor that is equipped withsignal conditioning circuit and temperature calibrator makes this sensor stable against temperature changes. For this sensor measurement accuracy using micro-machine techniques,....
The values of LM56 Thermostat project Circuit diagram of R1, R2 and R3 for the points of travel, VT1 and VT2 can be determined using the subsequent equations. This thermostat of electronic circuit with IC LM56 diagram what simple project, you can use as....
To resolve SSB or CW, a BFO signal may be coupled into the intermediate frequency amplifier. In these circumstances, the BFO has to operate near the intermediate frequency of the receiver, for transmissions of all frequencies. So with a BFO of this type,....
The article "Creating a Line Follower Robot with AVR [Censorship]" is a continuation of Line Follower Robot article with a new AVR ATMega8535 samapai phase Line Follower Robot block diagram. In the article "Creating a Line Follower Robot with AVR Part 1....
This can also be called a poor man`s hearing aid because it can be constructed from some low cost components although its performance is not comparable to that of commercially available sophisticated hearing aids, still it can serve the purpose well for....
Circuits of this kind are intended to drive LED Arrays in order to create more visibility and conspicuity when a vehicle is stopped or stopping. This circuit, in particular, will emit a visual alerting signal of 4 short flashes, followed by a steady on light....
In rainy seasons, it is very annoying that wiper of your car wiping instantly all the time. Have you ever think of speed control of the wiper. There are wiper control modules available on the market but most of them are costly. So here is an automatic wiper....
This simple pc scope probe is nothing more than a fet follower. It has a high input impedance and a low output impedance tomatch a mic or line input socket on a pc or laptop. This means it is then practical to examine waveforms under test, for example logic....
Unplugging or re-connecting equipment to the serial COM or PS2 connector always gives problems if the PC is running. Even if you only need to swap a mouse or changeover from a graphics keyboard to a standard keyboard. The chances are that the connected....
As we activate to adore those apathetic bleared canicule of summer, the best important affair on best of our minds is how to accumulate air-conditioned during those hot days. For some of us that agency axis up the old air conditioner and sipping on a nice....
Quiz-type game shows are increasingly becoming popular on television these days. In such games, fastest finger first indicators (FFFIs) are used to test the player`s reaction time. The player`s designated number is displayed with an audio alarm when the....
Nowadays you can buy white LEDs, which emit quite a bit of light. They are so bright that you shouldn`t look directly at them. They are still expensive, but that is bound to change. You can make a very good solid-state pocket torch using a few of these white....
The circuit depicted here forms one half of a device that will prove extremely handy when tracing the path of electrical wiring in a building or to locate a break in a wire. The system is based on similar equipment that is used by technicians in telephone....
In this card there is a constant current source is used to activate the phone. The LM339 is used to detect out of hand and the hand of the condition. There are circuits repeat the same because we have the phone interface 8. When the phone on hand in the....
This type is commonly used by home users for the Presidency with their PC. UPS to be able to do this type of filtration against power failures and flow management, in addition to design efficient, small size and inexpensive. UPS is the type most often used....
Wireless FM transmitter circuit Microphone Hi Fi using a model-ready transmitters, this is because the buil-up transmitter module has a transmission capability of a stable and very effective to emit 10 mW RF. so that the target of Hi Fi FM Wireless....
The servo motor have many utilizes in everything from robotics to puppetry to photography and beyond. These tiny motors can position their output shaft to any position on command and hold that position. Most servos possess a range of motion to about 210....
If you have an application in which a MOSFET is already used to switch a load, it is relatively easy to add short-circuit or overload protection. Here we make use of the internal resistance RDS(ON), which produces a voltage drop that depends on the amount of....
Circuit Colpitts Oscillator schematics Circuit Electronics, Colpitts oscillator is very similar to the shunt-fed Hartley oscillator. The principal difference is in the tank circuit. In the Colpitts oscillator, two capacitors are used as replacement coils are....
This Hi Fi stereo preamplifier circuit is congenital with TDA1054 IC from SGS. TDA1054 is a 16-pin DIL amalgamation and integrates 2 abstracted preamp circuits. It is a low babble preamp with little or no botheration in the building process. The aboriginal....
This circuit allows audio monitoring of a remote location and so doubles as a room monitor or baby alarm. It canbe run from a 12 Volt battery or mains power supply as shown below. Interconnect uses 3 wires, so multi core cablecan be used; alarm or telephone....
This audio amplifier designed uses two LM3886 per channel, in parallel circuit, based on the PA100 parallel amplifier detailed in National Semiconductor`s application note - AN1192. This amplifier can deliver about 50W into a 8-ohm speaker and 100W into a....
As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET....
The project explains how to make simple AVR High Voltage Programmer using Arduino. It can be used to fix/recovery wrong fused AVR chip....
The i2c-tiny-usb project is an open source/open hardware project. The goal of i2c-tiny-usb is to provide a cheap generic i2c interface to be attached to the....
This is a simple and low cost desktop headphone amplifier for the office. The amplifier concept is simple and follows a typical single-ended class A circuit....
Powered by LM2700 IC, this charger can help you to re-charge your mp3 player, camera, cell phone, and any other gadget you can plug into a USB port with faster rate....
When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this....
This project shows you how to build simple flashing light based on IC 555. The 555 has function as clock generator with dutycyle less than 100 and more than 50. The other components are Voltage regulator, 3 power amber LED and passive component like resistor....
This project shows you how to build a robot voice generator with IC HT8950, a powerful voice modulating IC. The circuit has Robot function, Vibrato function and....
The aim of the project is to build simple low cost inductance meter. The main parts of the project are IC 555, Transistor, resistor and capacitor....
When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc....
Nowadays, just about every house has an outside lamp with a motion sensor. Such a device eliminates the need to feel your way to the front door, and it apparently also scares away intruders. The only problem is that free-running dogs and cats in the....
Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, it is not difficult to build a data transmission module and connect it to the corresponding header. As....