Popular Circuits Page 99
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This project came about due to my interest in a new form of radio transmission called DRM, which stands for "Digital Radio Mondiale" (see This is a new form of digital shortwave transmission. A few devices are available from Europe for decoding the digital....
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Most of the IR remotes work reliably within a range of 5 metres. The circuit complexity increases if you design the IR transmitter for reliable operation over a longer range, say, 10 metres. To double the range from 5 metres to 10 metres, you need to....
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hi every one im not in the line to electronics so please can any one make a diagram for me that how i change this circuit so that it will dial a number using speed dial and also beeps a siren when triggerd and i also add some vibration sensors as siren....
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This is the first part of my Arduino controlled PWM RGB LED project, featuring distance / PIR sensor control and sleep mode....
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This USB car charger circuit adapter from car cigar socket project is a DC DC power converter that safely converts the 12V car battery voltage into stable 5V. This circuit can be used to supply power from a car cigar lighter socket to a por....
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The circuit warns car drivers when the air temperature close to the ground approaches 0°C, thereby indicating possible formation of ice on the road surface. Op amp A1 is wired as a voltage level sensor. Op amp A2 is wired as an astable multivibrator which,....
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This page describes the development of electronics to display a monochrome video image on an electrostatic oscilloscope tube. This work is complementary to the Electron Optics page in the Experiments section. The ultimate goal is to display a moving video....
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The following circuit shows about Mini Audio Amplifier Circuit Schematic Diagram. Features: power less than 3mA, small output, using push-pull ....
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Being able to determine the polarity (cathode versus anode) and basic functionality of a diode is a very important skill for the electronics hobbyist or technician to have. Since we know that a diode is essentially nothing more than a one-way valve for....
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You will need an oscilloscope capable of displaying in X/Y mode, and a reference "LO" signal source. In-phase and Quadrature reference square wave signals are generated by a divide by 4, 2 bit ring counter using 2 D type flip - flops. So that I could use an....
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By coupling two back-to-back diodes in series with an ac power circuit, a voltage of about 1.4 Vpp can be obtained. This..
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Designed in the fifties, this pre-amp remained in production until 1975. And, it remains fully functional and serviceable today. This discussion is designed to help owners do some basic troubleshooting and, we`ll get into some depth of circuit operation as....
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MC44BS373CA: PLL Tuned UHF and VHF Audio Video High Integration Modulator MC44BS373CA The MC44BS373CA Audio and Video Modulator is for use in VCRs, set-top boxes, and similar devices. By Freescale Semiconductor, Inc ..
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A relay is essentially an electrically operated switch it has a coil that uses magnetism to close the contacts on the switch. In automotive terms 12V running through the coil will allow 12V to run through the switch contacts. So why is a relay useful You can....
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1W stereo headphone amplifier circuit, built based TDA2822, designed portable players, radios and other electronic devices which can use headphone as the output...
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A Direct-Coupled 6V6 Tube Amplifier with Cathode Follower by Raymond H. Bates from Radio & Television News magazine November 1949..
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This is a very simple circuit of UHF band TV antenna booster with 15dB gain power. This low cost antenna booster is simple and easy to build. This ....
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The power supply circuitry consists of a 220/2 * 18V / 3.5A transformer, a rectifier, a smoothing filter, a power amplifier, LM301, and two regulators LM317 and LM337. The theoretical of the circuit is shown in the figure. The voltage from the transformer is....
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Here is the circuit diagram of a simple 24W mono amplifier using IC TDA1516. The TDA1516 is an integrated class B power amplifier in a 13 pin SIL package. The IC has many useful features such as short circuit protection, load dump protection, thermal....
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The BC547B has Vcbo=50V, Vceo=45V, Vebo=6V, where-as the BC548 in original circuit has Vcbo=30V, Vceo=30V, Vebo=5V, rest of the parameters being pretty same as per datasheet (hFE:220-450). 1HP Water pump (220VAC, 800W) - One thought is to use higher current....
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This is a design of metal detector requires alone a scattering of apparatus and an evening`s work. Congenital about a cmos4011 IC, is actual able-bodied and versatile. The 250 kHz advertence oscillator is congenital with two gates (U1/1 and U1/2), C1, R1 and....
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I opened remote of a RC car and extended wires out of backward, forward, left and right switches. So when I ground anyone of then the circuit completes andit sends signal to the car. I wanted to close the circuit using one of the I/O pins of BeagleBone....
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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 application note describes a driver solution developed using the Zetex ZXLD1362 LED Driver IC for an automotive EMC compliant solution. ZXLD1362 Switching Regulator allows to maximize the efficiency gains offered by LED lighting solutions in automotive....
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This instructable will teach you how to make a laser trip mine. If someone steps in the lasers path I have gotten it to set off a L.E.D., but you can....
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Because the two amps are the same except for their power sections, we can combine both those questions so that each one helps to explain the other. And when you get a chance to audition the two amplifiers, you`ll be treated to a demonstration of the musical....
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The following circuit shows about 1993 Toyota Hilux Pickup Power Window Control System Electrical Circuit Diagram. Features: helpfull for yourself and mechanic repair. Component: door lock relay, junction block, power window motor, power window switch,....
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The unique circuit design, technology and reasonable structure, all-discrete components, Class A FET output. As shown in Figure 2-31 below. Full circuit consists of an input stage, an output stage and power level to promote and Gm volume control circuit...
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If you want to make your robot sense the objects in it`s surroundings i suggest you to go for an ULTRASONIC sensor. Though the IR based sensors are cheep, their working range may vary due change in ambient light and won`t give accurate range values. In case....
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Circuit R1 R2 + RP + size branch resistance value determines the magnitude of the current I, the current should be..
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Super boost bass circuit this be low pass filter circuit model,which will low pass filter. By give bass audio that firm then convenient for a person who like....
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A very simple music instrument/keyboard for playing music using a 555 timer chip circuit, a piece of paper and a pencil. To see it in action watch the how-to-make video below. And then I made the much fancier automatic music player in the photo below by....
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Small and portable unit, Can be built on a veroboard The amplifier s gain is nominally 20 dB. Its frequency response is determined primarily by the value....
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Originally Posted by dscottguitars A rotary 3 position 3 pole switch. In one pole, through a cap out the other pole, no bleeding from one cap to the....
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The GLMDPCB motion detector board is a double sided etched, screened and drilled printed circuit board designed for the GLMDA motion detector circuit shown in the schematic below. All or part of the circuit can be built. For some robotic and other special....
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This circuit uses an RCA CA3162E (IC2) A/D converter. This converter has 12-bit output (BCD) which is sent to display decoder..
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The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately, this....
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Step-by-Step instructions for adding a remote control interface to F/G CED players which can be used with a variety of Atari and Sega joysticks including wireless infrared controllers....
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The special characteristic of this regulator is that the output voltage can be adjusted down to 0 V. The regulation is pr..
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The TDA8581 from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8 ohm l....
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You might find yourself needing a low power H bridge for driving a motor like I once did. The 555 IC can drive a load up to 200mA, source or sink, which might make is usable as a driver, if one can control the output as desired. Although it is an unusual use....
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Life in the 21st century would be almost unbearable without some of the computer peripherals that PC users now look on as essentials - take for example the USB powered teacup warmer; this device is obviously an invaluable productivity tool for all users but....
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The circuit is based on the grid-dip or absorption effect, which occurs when a parallel resonant circuit is coupled to an oscillator of the same frequency. Q1 operates in a conventional Colpitts oscillator circuit at a ftxed frequency of approximately 4 MHz.....
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The LED with integrated flasher is connected in series with the base-emitter junction of transistor Tl. Thus, the l..
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A sensor SEN1 output DC voltage varies linearly according to the relative humidity. This DC voltage is supplied through R1 and R2 to the A/D converter chip U2. R4 to zero. LCD ..
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I built a simple 1KHz 6Vpp Sine Wave Generator from a handful of opamps and passives I had laying around. You can check out that project here. I thought it would be fun to quantify just how good of a Sine Wave this circuit was; after all it was just a....
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This can be used to control entry on a Cat or Dog Door" NOTE: There may be some changes and improvements coming. However this circuit does work and you can build it as shown. The PCB Shown below is Available from me, or make it yourself. It Measures 2.75" by....
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A high efficiency simple 2-transistor VHF amplifier electronic circuit project can be designed using this electronic circuit diagram. This VHF amplifier electronic circuit has a very high efficiency of about 16dB gain, and requires no tuning or alignment....
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Here is a very simple project of a door bell circuit. The heart of the circuit is UM66 melody IC which is a great and very famous melody IC, comes in TO-92 transistor package. The IC has only three pins and it is a complete melody system requires no external....
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The circuit presented here may provide a solution in a number of cases, since it can be used to convert a single-ended supply voltage into a balanced set of supply voltages. That`s not so remarkable by itself, but the special feature of this circuit is that....
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Common diode balanced modulator circuit is shown. It consists of two identical performance diodes and a center-tapped transformer T composition. Diodes VD1, VD2 are 2AP9. Other..
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The circuit diagram shows a regular charger being powered by an AC input source, intended for charging batteries. This type of rechargeable batteries are....
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Construction LED circuit shown in Figure. It requires manual power, after the circuit is powered, the light will blink to remind people to pay attention to safety. ..
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Circuit (a) lets you delay the leading edge of a positive pulse while leaving the trailing edge almost unaffected. A positive input transition, inverted hy IC2, has no effect on IC1B. However, when the positive transition reaches IC1A, (delayed hy the....
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Incandescent lamp has been used to reduce harmonic distortion in sine oscillator circuit. The nonlinear resistance characteristic of the lamp filament help the...
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IR`s Wibowa Chou explains the advantages of 4th-generation IGBTs over MOSFETS with a practical solar inverter application...
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This is a revised version of my LM35 based digital thermometer project that I posted last year. Although it is one of the simplest projects, it is very popular among newbies who are just starting to learn microcontrollers. There was a little flaw in the....
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A useful timing strobe can be constructed using high-brightness LEDs and a few common components. Ignition pulses from the number 1 cylinder high-tension lead are used to trigger the circuit via a home-made inductive pickup. Transistors Q1 & Q2 buffer and....
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NE5532 preamp generally used, performance is very good. Now used as a small power amplifier, how effective And the general op-amp circuit is almost the same, but one of the resistors, capacitors have a greater change, the state and not the same op-amp circuit...
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These require power to work. Sometimes, that`s a battery you put into the mic. Sometimes it`s a separate dedicated power supply with a special multi-pin cable. But most often these microphones use phantom power. This is power deliveredby a mixer or console,....
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Calibrate the measurement circuit by forcing a known conductor current and measuring the resulting voltage output. If sensor to conductor displacement changes, recalibrate This sensor circuit can measure DC and AC currents to the bandwidth of the op-amp.....
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The ambit declared actuality is that of a metal detector. The opera- tion of the ambit is based on superheterodyning assumption which is frequently acclimated in superhet receivers. The ambit utilises two RF oscillators. The frequencies of both oscillators....
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Based on a National Semiconductor application note, this circuit uses an LM317 3-terminal regulator (REG1), chosen because of its built-in over-current and over-temperature protection. Its output is boosted up to just over 5A by the MJ2955 transistor (Q1).....
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Description: AT89S52 For Bell Timer Circuit Diagram. Features: 7segment display is replaced with LCD display. DS1307, uses AT89S52 microcontroller and I2C ....
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A wideband high-frequency amplifier is shown, the circuit resistance and capacitance coupling of common emitter amplifier can be used to amplify high frequency signals. When th..
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We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon. ..
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This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 - 30MHz with an input sensitivity of greater then 100mV. The probe connects to the PC serial port. So by using the crystal oscillator already present on your PC....
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I decided to make my own K9AY antenna system and controller. Basically, after looking at the currently available commercial version, I figured I could make a better unit for less money and be happy. The basis for the K9AY antenna is that it has a steerable....
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Car power amplifier uses SI1050GL IC as the main amplifier. The output power 50 Watt 8 ohm mono impedance. Up to 25 Volt DC voltage. with source voltage of this amplifier car battery has to work. Minimum of 12 Volt battery voltage, less than a sound or audio....
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This article describes how to build an opto-isolated power switch for controlling heavy loads with logic levels....
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Exhaust fan is an important component in kitchens. Here is a simple circuit to control kitchen fans by monitoring the ambient temperature. It is built aro....
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Microcontroller Based Accelerometer Project. Just as a speedometer is a meter that measures speed, an accelerometer is a meter that measures acceleration ..
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This kit, designed by Jan G0BBL and implemented and distributed by Tony KB9YIG, is a plug-in board for the Softrock Lite + Xtall RX V9. 0 which down-converts VHF signals in the 2m and 6m bands to HF signals that can be received on the V9. 0 RX. Also....
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The values of Rl, R2, and D1 are selected for the voltage applied. Using a 12-volt battery, Rl = 10 K, R2 = 5 K and D1 is a 5-volt zener diode, or a string of forward-biased silicon rectifiers equaling about 5 volts. Transistor Ql is a general-purpose UJT....
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After having its engine and other mechanical parts restored to its optimum condition, the next thing I had in mind is to add aesthetic lighting. I went to a local electronics store and found these 12V DC Operated LED Strip. These are perfect for what I had....
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Make yourself this simple dc to dc mobile battery charger and charge your mobile phone battery whenever and wherever you want, simply by connecting it to a 12 volt source from your car or motorbike battery....
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The flash that is built into digital cameras is designed for indoor photography. At subject distances of greater than five meters or so, the light is usually not powerful enough to take a satisfactory picture. Unfortunately most such cameras do not include a....
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The Command Transmitter-Receiver (A3023) is intended to test the command receiver we propose for the ISL (Implantable Sensor with Lamp) in our Conceptual Design. The A3023 is a LWDAQ Device in two parts. The Command Transmitter section contains a 146-MHz....
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Homemade 20W fluorescent lamp dimmer Using the method of connecting capacitor in series can easily control the brightness of fluorescent lamps. To adapt to different lighting requirements. Figure 28 is a modified circuit diagram. When the switch connects to....
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Audio equipment from the former speaker output terminals left and right channel signal, the Rl, RZ mixed units, after ICla buffer into the high and low pass filter. Filter uses..
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This is an enhanced version of the simple Garage/Shed Alarm. The Entry and Exit delays have been increased to about 30-seconds - and I`ve added a timed Siren cut-off and automatic Reset. I`ve also replaced the LED with an entry Buzzer. These enhancements....
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The low-cost Mini-Circuits MAR-X series of chips offer the RF builder a real advantage, with their inherent 50- input and output impedances (needed for RF systems). An MAR-1-based receiver/scanner preamplifier is shown. Ci and C2 are chip capacitors. Use....
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The all-analog circuit presented controls the rateat which a miniature turbojet engine can be throttled. Increasing or decreasing the throttle too quickly on a miniature turbojet engine, or any jet engine, can lead to quick failure in flight, causing....
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Circuit, power supply circuit consists of step-down capacitor c1, bleeder resistors R, Zener diode vs, the entire diode VD and filter capacitor G, switches and batteries GB s c..
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This article lists various types of audio amplifier circuits using Mosfet. We have tested all these circuits in our lab and we found all of them performing satisfactorily. The amplifier employs only one transistor and two MOSFETs and few resistors and....
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A small Tesla Coil (12" range), Jacobs Ladder or a "Antigravity Project" from the book `Electronic Gadgets for the Evil Genius`, but I am having a very hard time locating part for these projects. It is a nice book but there project cost estimate is way of....
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Radio-Circuits has raised the bar with this site. Unlike any other circuit site on the worldwide web, they have taken 10 of the most clicked into FM Transmitter circ....
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A keyed power input connector, series rectifier and a shunt rectifier, both 1N4007, prevent reverse voltage from being applied to the power input. A 27 volt metal oxide varistor clamps the voltage to the 78L05 that follow it, to less than 30 volts, thus....
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This is probably the simplest idea to generate flashing light from an LED using AC. The circuit is relatively the simple way of flashing one or more LEDs from a high voltage DC obtained from Mains. This can be used as a Mains indicator or Mock flasher. The....