Popular Circuits Page 59
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This article describes an amplifier Audison LR604XR principle. The principle is simple there, we recommend that combine text carefully read the complete schematic. To better grasp this principle, it is recommended to read several times on this principle. 1.....
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This is VERY illegal. As a consumer, you MUST comply with part 15 of the rules and regulations. Part 15 states that your device must accept any interference received, and it cannot cause any harmful interference. (Such as jamming an FM signal. ) It is even....
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This self-starting fixed frequency oscillator circuit gives excellent frequency stability. Rl and Cl comprise the frequency determining network while R2 provides the regenerative feedback. Diode Dl enhances the stability by compensating for the difference....
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This simple circuit switches on a light around 2 hours after midnight, the time at which most of the robberies taking place. This simple circuit is build around a CMOS IC 4060 to obtain the required timing. During day time the LDR has low resistance and....
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The 60 Hz Frequency Generator circuit is very urgently needed to make the inverter or hardware related to the AC current voltage. This 60 Hz Frequency Generator is very simple and has a high accuration, the squarewave as the output which is precision. The....
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Explore power amplifier integrated circuit from National Semiconductor LM4780. What`s so special Well, first of all - a very low harmonic distortion. In general, manufacturers indicate the maximum power of his ingenious craft regularly with the harmonic....
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This is a constant current source using a FET. This is the most simple replacement to series resistor to limit current. The N-Channel FET BF256C can give 15mA current. Simple Methods Before you get to use chips, experiment with some methods, which will help....
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I`ve had a few requests for a quiz circuit, so here is a 4 input design which can easily be modified. Maybe, I should write the application notes in the style of a game show host. This design uses four IC`s and has four input circuits and four independent....
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Here is a strobe light circuit which has an option to set the flashing rate. Unlike other circuits here we use a Flash tube that usually use in flash cameras. In ordinary cameras, the flash may be work only after ten or twenty seconds. But in this circuit we....
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This circuit is used to record telephone conversations on your landline telephone. All you will need is this small circuit and subscription of your PC. There are few times when we forget what we said or told us. So we need recording. Sometime, not many years....
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FM and AM transmitter in one small device built of cd4001 integrated circuit. It broadcasts on 20MHz(AM) and 100Mhz(FM)....
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This webpage describes a highly efficient LED dimmer, or a dimmable LED flashlight, or a switching current source, or whatever you want to call it. Cheap, single-IC, uses commonly available parts, easy to build. Designed to get the longest light out of a....
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Efficient nickel-cadmium battery charger IC (LTC1148) circuit ..
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Temperature control is achieved using the REF-02 +5 V Reference/Thermometer and a CMP-02 Precision Low Input Current Comparator. The CMP-02 turns on a heating element driver (Ql) whenever the present temperature drops below a setpoint temperature determined....
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Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently. The major concern is the low input impedance of the detector-amplifier bipolar stage. Nevertheless, it can be easily compensated with positive....
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My projects typically involve many LEDs and microcontrollers. However sometimes I just love the simplest of things with LEDs. One of the very basic L....
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Made of SS0001 human pyroelectric voice alarm circuit diagram as shown: Pyroelectric infrared language warning device described in this article can be used to prevent electric shock or theft, after a little modification can also be used for automatic light....
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But here is a new type of infrared using TX05C radio sensor module made of doors and windows burglar alarm. Because it is not visible to the human eye utilizing infrared, wirel..
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This analog switch circuit is designed to switch on or off and analog line. it consists of two analog switches in IC form that are controlled by two pushbu....
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Figure 3-2 (b) is the second half of the circuit, VT17 ~ VT31 group into power amplifiers, pre-amplifiers, and it is a structure composed of exactly the same oIC2 its zero serv..
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This is a schematic for radio receiver circuit. This circuit is based on the TDA7088T that can be used in mono portable and pocket radios. This is a bipolar integrated circuit. This is the figure of the circuit; When a minimum of peripheral components (of....
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This electronic game is simulation of one-arm bandit game. Electronics hobbyists will find it very interesting. When toggle switch S1 is in run` position, all segments of 7-segment displays (DIS1 through DIS3) will light up. On turning toggle switch S1 from....
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This complete high quality, low noise 5-BAND GRAPHIC EQUALIZER circuit is based around Monolithic Linear integrated circuit LA3600 manufactured by SANYO. This circuit is very easy to build and has good Quality. You can use it with Portable component stereos,....
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An amp that uses 211 or 845. It puts out just over 40 watts. The tube must run in A2 to get this power, which is not a problem with a good driver. The secret is a good follower, you use a 6BQ5, I use a mosfet. You use 7K ohm load on 1000 volts, I use 10K ohm....
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The Astable multivibrator circuit has no stable state. With no external signal applied, the internal transistors alternately switch from cutoff to saturation at a frequency determined by the RC time constants of the coupling circuits. So an Astable....
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This project uses only a few of the instructions that come with PicBasic, but serves to show how easy PicBasic really is. It also shows how PicBasic strongly resembles programming the BASIC Stamp. Here we are using the serin command, and a couple if then....
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2 x 18W Hi-Fi Stereo Power Amplifier based around two TDA2030 ICs. It has good input sensitivity, low distortion, good operating stability and full protection against overloads and output short-circuits. It can be used as a booster amplifier for existing....
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Here we use the PIC16711. Rechargeable battery capacity is rated in mAH (milliampere-hours). The total capacity of a battery is defined as "C", that is it can supply C mA for 1 hour, or 2C for 30 minutes etc. Charge rates can vary from trickle charges to....
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Although not a new device, the LM317 is still a high-performance regulator. Its output voltage is essentially immune to fluctuations in load, supply volta....
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One still designing that it uses in the exit transistor of technology V-mosfet. This transistors to us offer a lot of virtues concerning the simple bipolar transistors, as high speeds, thermic stability, low distortion etc. Beyond this circuit use also other....
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This system uses a transmitter at around 100 kHz (see Fig. 86-3(a)) to control a remote rece..
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The original design used a VCXO (voltage-controlled crystal oscillator) for this function, but this revised design implements an all-digital method that provided additional functions, using a midlevel CPLD from Altera (www.altera.com)...
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This page describes a dual axis stepper motor controller design and printed circuit board for an equatorial mount. Much thanks goes to Bill Prewitt for his help in the design of this web page. Download encapsulated postscript file of the artwork. This file....
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There are 3 basic types of earphones, each with their set of benefits and problems. Small transducers that are inserted into the auditory canal. This leaves only a few millimeters of a mismatched acoustic transmission line between the vibrating diaphragm of....
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The diagram is lamp dimmer which has the function of light gradually, gradually eliminate. It does not appear the light stimulation of the human eye when the lights suddenly illuminated, and also can reduce the damage when open lamp impact current to the....
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ICs have largely replaced circuits such as this, this circuit still finds use where the flexibility of a discrete device design is desirabe. Parts are easy to obtain and the problem of IC obsolescense is eliminated. The TIP31A can be heatsinked to a small....
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The aim of this design is to reproduce a Combo amplifier of the type very common in the `sixties and the `seventies of the past century. It is well suited as a guitar amplifier but it will do a good job with any kind of electronic musical instrument or....
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This project describes a little QRP transceiver full legal power” (5 W at 12 V) for the 40
meters band. The RIG may be built in a gradual manner, in fact it is divided in two main modules, or
you may also complete only the RX module. The RX section is....
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I have a 4 position slide switch according to the position of the slide switch, I should turn on different colored LEDs and also vary the output frequency of 555 timer in astable mode and drive a piezo buzzer. Problem : I cant use the same switch to control....
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Components like resistors R1 and R2, capacitors C1, C2, and C3, diodes D1 and D2, and zener ZD1 are used to develop a fairly steady 5V DC supply voltage that provides the required current to operate the multivibrator circuit and trigger triac BT136 via LED1.....
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The circuit will provide a 20 ±0. 1 dB voltage gain from 500 kHz to 50 MHz. The low-frequency response of the amplifter can be extended by increasing the value of the 0. 05- F capacitor connected in series with the input terminal. This circuit will yield an....
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The LA1061M is an Antenna switching controller for mobile Radio equipment. The LA1061M uses a number of inputs from the receiver circuitry to select the main Antenna or sub-antenna according to signal strength and quality. Weak and strong signals are....
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I have a bipolar motor, and software written for PIC 12F508 to drive unipolar motor. Is the schematic in attachment correct for this purpose? Coil A1, ....
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The current range in multimeters, particularly the more inexpensive ones, is restricted by the load limits of the internal..
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This circuit is allows you to use a cheap loudspeaker as a microphone. Sound waves reaching the speaker cone cause fluctuations in the voice coil. The voice coil moving in the speakers magnetic field will produce a small electrical signal. The circuit is....
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I designed the PC Power-on Combination Lock (PCPCL) last year for my GCSE Systems & Control project. The exam board stated that we must design a product under the broad category of `Safety and Security`. I already had in mind some ideas for what I wanted to....
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This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched....
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Pulse width modulator produce a PWM signal, a pulse with a constant frequency but with the duty cycle vary according to a modulating signal. Here is the...
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My original BFO, a small EICO 330 solid state signal generator, served well to bring in a variety of distant LW beacons. In late-2004/early-2005, a new One-Active Device (1-AD) contest to complement the Crystal Set DX contest was announced. Steve McDonald....
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The EN line is called `Enable`. This control line is used to tell the LCD that you are sending it data. To send the data to the LCD, your program should make sure this line is low (0) and then set the other two control lines and/or put data on the data bus.....
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This is different than the standard 555 oscillator circuit in that the LED is placed in the capacitor reset line (pin 7). By doing so, overall current is reduced and the high peak LED current does not flow out of the battery. Since the forward drop of the....
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This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 positioned as shown in the circuit diagram, the typical dual-tone sound of Police or....
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Digital precision pressure tester circuit shown in Fig. MAX1457 external ROM selection 93C66 type 4096b E2PROM. After power MCS end is pulled to a high level, check the main ch..
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This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz is audible to human beings. The sound of frequency above 20 kHz is called ultrasonic sound. The circuit described generates (transmits) ultrasonic sound of frequency....
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A very simple LED torch can be designed using the NSI45090JDT4G adjustable constant current regulator (CCR) designed by ON Semiconductor, using extreme few external components. NSI45090JDT4G device is designed to provide a cost effective solution for....
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Opening car`s door is very simple activity, and off course it`s just a daily activity which require no special skill. Almost nothing can go wrong, but....
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Most small portable radios require a 3-V supply, which is normally provided by two AA or AAA batteries..
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The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active....
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after SCL is high at hand must be refusal chande voguish SDA line lone followed by the data is legally binding, the data loose change be supposed to be there made only as SCL is low. taking into account transfer of lone byte of data the reciever has to....
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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 should be a dual log type potentiometer. The balance control is a single 47k linear potentiometer, which at center adjustment prevents even....
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This circuit be signal sound expansion from condenser microphone give with small-sized loudspeaker. It compose the importance is part pre mic use transistor just one enlarge sound signal gives the power goes up change come to a part amplifier with the....
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This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; eg, a door or table. Basically, it amplifies and processes the signal from the sensor and sounds an alarm for a preset period. In operation, the....
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The alarm circuit shown: alt="Menci alarm produced schematic circuit diagram"> Turn the power switch SW1, alarm electrical work...
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FIG inverter I, II and R1, R2, CI and SB constitute bistable trigger switch, each time the switch SB, the anti- phase II level to the output of a change. Composition R3, C2, VD..
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The parallel interface transfers data 8 bits (or more) at the same time, using eight separate wires. It is essentially an extension of the data bus into the outside world. The parallel interface is ideal for inputting or outputting data from devices that are....
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Automatic recording telephone interface circuit as shown, the circuit has an automatic answering and recording function (need to reprovision or small solid state recorder recor..
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Connect two 24 V / 3 W bulbs in parallel to the output and set the right frequency on PLL. Now turn on the transmitter. You should tune it on a receiver. Maybe you might stretch coils of the L1. Fix the L1 in position when the tuning voltage (on C4) is in....
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Schematic diagram below shows an ADP1821 Step Down DC-to-DC Converter circuit. This circuit uses ADP1821 that can be used to regulate an output with a load of more than 20 A. It can be done if he power components like MOSFETs, the bulk capacitors and the....
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The circuit described here can create three different US-style` siren sounds: police, ambulance and fire engine. The desired sound can be selected using switch S1. The circuit can be used in toys (such as model vehicles), as part of an alarm system, and in....
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This is a good Electronics & communication project on GSM Based Voting Machine System which uses AT commands to sens SMS through Microcontroller. The project has 2 modes viz. Normal mode and Security mode. In normal mode an authorized person of a local area....
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This transmitter can be used for transmitter hunts, for remote key finding, or for radio telemetry in model rockets. It can be tuned to the two meter band or other VHF bands by charging Cl and Ll. 11 is four turns of #20 enameled wire airwound, 0.25 inch....
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I removed the entire setup from a bike awhile back and it ran then, and also ran about a year ago in the engine stand that it`s currently mounted in now. This afternoon I went to start the thing up to test things out before selling it off and hit a glitch.....
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Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher ICs to simulate "whooper" sounds of electronic sirens used on some city police cars and ambulances. Two flashers are required for generating required rapidly rising and falling....
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This is a voltage multiplier circuit acting as an Ioniser. Its calculated to feed 220V from mains and the output is about 6KV. Caution should take with the circuit as can be dangerous due to mains. You can place a needle at the output 3cm long. ..
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A simple op amp and silicon diode are the heart of the temperature-to-voltage converter that will permit you to use an ordinary voltmeter-either analog or digital-to measure temperature. User adjustments make it possible for a reading of either 10 mV or....
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Miniature guitar amp featuring a class AB pentode output section using 5902 subminiature tubes....
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This micropower multifunction power management integrated circuit (PMIC) is designed using LTC3554 manufactured by Linear Technology Corporation and is a solution for portable Li-Ion Polymer battery-based applications. This micropower multifunction power....
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2 meters 144MHz push pull amplifier wich can generate 200W, how does it sound ? Sounds delicious with 2 DV28120T transistors. DV28120T push pull amplifier....
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Combining of video signals with pulses is accompanied by inversion of input signal. Value of R4 is 270 ohms for 5670 and 470 ohms for 6021. R2 is 680 ohms for 5670 and 1 K for 6021. Input signals must be positive. -NBS, "Handbook Preferred Circuits Navy....
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As shown in the circuit diagram of the device is looking for 555 cars, including a transmitter and a receiver in two parts. The transmitter 555 is a core component of the wave ..
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The following circuit shows about 12V PIR Sensor Timer Circuit Diagram. Features: 12 Volt DC, will turn on a floodlight or other device for a time ....
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BC547 transistor. Max operating current is 100 mA while max voltage is 65 volts. With the transistorlabelfacing the reader, the three legs from left to right are collector, base and emitter. Note: I destroyed one BC547 transistor while setting this up. I....
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The I2C serial bus is a popular two-wire bus lor small-area networks. I2C Clock and Data lines have open collector (or drain) outputs for each device-on the network. Only a single pull-up resistor is needed. With this arcliitecture, each device can talk on....
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This circuit uses Invisible Infrared light to detect the movement of people through the door. A short beep will be generated when the infrared beam breaks..
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The purpose of this circuit was to create a ring in which LEDs or Lamps illuminate sequentially. Its main feature is a high versatility: you can build a loop containing any number of LEDs or Lamps, as each illuminating device has its own small circuit. The....
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This circuit produces the power to drive a bipolar stepper motor. The rotation speed and the rotation direction of the stepper motor can be changed. This circuit consists of two integrator circuits (A1, A3) and the amplifier (A2) connected in series. This....