Popular Circuits Page 113
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This is a metal locator circuit. This circuit is useful to detect metal. This circuit uses a AM radio and one-transistor oscillator. This circuit is....
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Crystal frequency stabilization of frequency modulation circuit is shown below: ..
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This oscillator uses standard inverters, one resistor and one capacitor, and has no minimum operating frequency. R and C must be chosen such that currents into the gates are below recommended operating limits and that leakage current into the gates and into....
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Portable 230V lamp flasher circuit diagram. The circuit is completely transistorised and battery-powered. The free-running oscillator circuit is realised working with two low-power, low-noise transistors T1 and T2. One of these two transistors is constantly....
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This is a background music (SCA) decoder circuit from the input demodulated (multiplex) FM signal. We use NE565 (Phase Locked Loop IC) to be base of this....
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From ages electron-magnetic relays are being used as switches to control high voltage devices. But, because of their bulky size and noise (both electrical and mechanical) people started using TRIAC with opto-coupler as better alternative. Above circuit uses....
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The intercom schematic fulfills its tasks to provide a reliable communication line and is very simple to construct. The circuit is made up of an amplifier, two switches and two loudspeakers. If additional stations (speakers) are wished, additional switches....
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This circuit enables observation of movement between other stroboscopes. Generation of rectangular signal is based on NE555. This circuit requires a low power supply that is made from a simple transformer TR1, traditional rectifier bridge and zener diode.....
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A typical computer motherboard CPU power supply circuit A typical computer motherboard CPU power supply circuit, which is mainly composed of the main power supply management ch..
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The operating principle of the circuit is very simple. The first Led D1 is placed in series with the resistor R2 and diode D4.An only be lit this LED indicates that the battery is ypofortismeni. For this reason Led D1 is red. If the voltage is greater than....
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This high-performance circuit first quickly starts (and holds) the charge at 2 amp, but as the voltage rises the current will consequently decrease. When the current falls below 150mA, the charger automatically switches to a lower 'Float' voltage to prevent....
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The AVR Basic Infrared Transmitter is a sister project for the Basic Infrared Reciever. The emphasis here is on "basic" because the simplest version can be built using only 10 discrete components and a typical AVR microcontroller. Taken together, these two....
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It is a little collection of amplifiers in bridge connection. The output power is low and they are for general use. They can be used with small active loudspeakers, car stereos etc. The only restriction, is that we should use loudspeakers with resistance....
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This scheme applies amplifier OpAmp LM301 to awaken square wave that is simple. LM301 applies power allowance 3 V - 36 V, with highest frequency 325 kHzs. Oscillation frequency given in equation. where f is Hertz, R in Ohm, C in Farad. Active Pressure C1....
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The goal was to convert this radio for operation on the 70cm amateur radio band. This was unsuccessful as the VCO will not oscillate at the right frequencies for 70cm operation (the VCO control voltage bottoms out before the VCO gets anywhere near the 70cm....
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You can use Microchip`s low-cost PIC16F818 microprocessor and a pair of gates to construct a digital PLL that can clean noisy digital signals over a range of 4 to 40 kHz. Featuring programmable lock range, phase differential, and loop gain, the digital-PLL....
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A 4-bit adder which adds two four bit binary numbers with a Carry in line. The diagram above show the logic gate schematic of a 4-bit adder. A full adder take in two number and a carry in line, while a half adder does not allow a carry-in bit. Although both....
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60 kHz transformer consists of a 18 x 11mm ungapped pot core (Siemens, Fer-rocube, etc), utilizing magnetics incorporated type "F" material wound with SOV2 turns of No5 wire for the secondary and turns for the primary..
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This circuit will activate a relay when light falls to a preset level. Light level can be adjusted with VR1 and the relay contacts may be used to operate an external light or buzzer...
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The VHF frequency is generated by a tuned Hartley oscillator circuit. Resistors R2, R3, and R4 bias the transistor, with tapped inductor LI and trimmer capacitor Cl forming the tank circuit. Adjusting Cl determines the frequency. Capacitor C2 provides....
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A working circuit with an opamp but my professor said that they are hard to work with, and gave me some transistors to use instead. enthdegree May 30 `13 at 17:25..
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Using this circuit, you can change the speed of the fan from your couch or bed. Infrared receiver module TSOP1738 is used to receive the infrared signal transmitted by remote control. The circuit is powered by regulated 9V. The AC mains is stepped down by....
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escriptipn: The following circuit shows about Railway Turnout Control Circuit Diagram. Features: logic level in the range of 512 V, used to control model ....
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This reciever uses the TDA1072A which is a complete AM reciever on a chip and it only requires comparitively few peripheral components to complete a high quality AM radio Circuit. Unlike some other AM radio ICs, a minimum number of external tuned inductors....
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The inexpensive 7404 hex-inverter has enough amplification to handle a wide range of transducers. Closing the key completes the battery circuit and applies four to five volts to the 7404. Bias for the first two inverter amps (Ula and Ulb) comes from the two....
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The circuit is a linear regulator providing galvanic isolation from main line through the use of isolation transformer. Quite safe for experimenting with AC voltage. Below pictures show the example of input/output terminal connections, labeling and....
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The hardware (as I have bullt it) is constructed from two modules, one to capture the signal and provide timing functions, and the second as transmitter placed somewhere near the target equipment. I have interfaced this to my IBM compatible PC on the printer....
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The Physical interface bus being either fiber [Optical] or wire [electrical]. The difference here, in some cases, is that the electrical interface being defined resides just prior to the optical encoder. So the Physical interface bus from device to device is....
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This circuit provides a cheap alternative to the LM3915 series LED displays. The meter relies on a square-wave oscillator built around two CMOS analog switches, which alternatively selects the right and left channels for monitoring and display. The selected....
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This report deals with the design for a small asynchronous serial data switch. The switch architecture allows 14 serial ports supporting a subset of the RS-232 protocol. The requirements for the switch are discussed. The hardware interfaces are described in....
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The following circuit shows about Automatic Light Dimmer Circuit Diagram using 1N4007 Diode. Features: built into a wall-mounted box containing ...
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Traditionally, the reception quality of a digital receiver is expressed in terms of BER (bit-error rate). This figure is the proportion of received bit errors in a given period. Typically, you measure the BER in the lab by applying an RF signal, modulated by....
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As shown by INA321/322 configured to directly drive the capacitive input A/D converter shown in Fig. Since INA321/322 output is low resistance, and therefore work at high frequ..
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and Flash Memory schematic that can be done from the following sources: power-on reset, external reset, software reset, watchdog timer reset, and brownout reset. The figure (click to enlarge) shows a recommended external reset circuit for the MSC1210 with....
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This USB car charger adapter project is a DC DC power converter that safely converts the 12V car battery voltage into stable 5V. This USB car charger circuit can be used to supply power from a car cigar lighter socket to a portable device that require a 5....
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This low-voltage high-current output, sWitching de power supply is running off the 220-Vac input. In this circuit, an ST2 diac relaxation oscillator, Q3, Cl, and the diac, initiates conduction of the output switching transistor Ql, the on-time of which is....
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The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer. The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the....
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An Apex PB50 Booster Amplifier, plus an IC op amp, can be used in a high-voltage op amp that converts a small analog signal to a 180-V p-p signal.Apex Microtechnology manufactures a number of power op amps...
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The transmitter is built around two CMOS 555 timer ICs (TLC 555s). The transmitter generates a modulated 35-kHz ..
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This project uses a widely available IRF510 MOSFET. This N-Channel enhancement mode silicon gate power field effect transistor is an advanced power MOSFET designed, tested, and guaranteed to withstand a specified level of energy in the breakdown avalanche....
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I had heard some stories in the past concerning how poorly the 555 ran below Vcc = 5V, so I embarked on an endeavor to see if I could improve operation. Th....
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Most LED driver circuits use a series resistor to control the current through the LED. For applications needing a few LEDs, this is optimal. However, for applications needing many LEDs, this becomes extravagantly inefficient and it is tempting to keep the....
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As shown in FIG exchange by PGA204/205 op amp OPA602 constituted coupled programmable amplifier. The OPA602 op amp circuit to form a feedback Ref foot while external op amp OPA..
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An electronic musical keyboard as a source of variable-frequency AC voltage signals. You need not purchase an expensive keyboard for this - but one with at least a few dozen "voice" selections (piano, flute, harp, etc. ) would be good. The "mono" plug will....
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If the CMOS circuit load (actuator) is a relay device, the circuit must have a large load capacity. Non-gate drive switching amplifiers ..
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PLL oscillator is used to get very stable frequency woth very low distortion of sine wave output. The stability is equal to crystal-based oscillator, and the low distortion level of the sine wave output is equal to LC based oscillator. The method ofPLL....
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This circuit came from a need for a "quick and dirty" network tester that could be operated by one person. All the commercial units I tried required a person at the other end to check the remote LEDs, as the transmitters could not be made to cycle through....
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Using analog audio line delay, you can adjust your room virtually. Just turn a knob in your audio set and you can adjust your room size. The circuit described here will make your dream come true, giving a feel that your speaker is located 15 meters behind....
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This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only special` component in the circuit is a window discriminator (a fancy version of a window comparator). Resistors R1 and....
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This is for all the spies/paranoid people out there. An essential piece of equipment for any spy is an Electronic Bug Detector. You never know what go....
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Displays up to eight different DC voltages on CRT terminal of microprocessor under key-board control, using BASIC commands and BASIC routine given in article. Uses Motorola MC14433 modified dual-lamp integrating analog-to-digital converter. Unknown voltage....
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The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
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This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN. A digital potentiometer is a digitally-controlled electronic component that mimics the analog....
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The simple mixer schematic is built on common base principle, where input voltages are transformed in alternative currents wich are summed to form the alte...
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A simple meter to check the balance of currents running in the two legs of a transmission line. It can be used to check the balance of currents between the inner conductor and the outer coaxial conductor in a coax cable as well as between the legs of an open....
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This index is arranged alphabetically on each word (except prepositions). For example, the "Frost Alarm" will be indexed under "A" and also "F". To quickly find a circuit use the top index or try your browsers search function. In Firefox, Konqueror, Opera....
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This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It features two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....
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A car alarm in its simplest form, needs to be nothing but one or more sensors connected to some sort of siren. The very simplest alarm would have a switch on the driver`s door, and it would be wired so that if someone opened the door the siren would start....
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The diagram is a power supply circuit using the isolated feedback capabilities of the TL3103 for both current and voltage sensing. This supply is powered fromthe ac power line and has an output of 5 Vat 1.5 A. Both output voltage and current are sensed and....
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Ultrasonic sound wave can be generated using electronic circuit. This simple electronic circuit can generate an ultrasonic wave with frequency range of 12 to ...
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In addition to using the LA3600 IC, was the 5 channel graphic equalizer. We can also be designed was the 10 Channel Graphic equalizer circuit. By connection....
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As shown thyristors - linking arm rectifier module three-phase half-controlled bridge rectifier circuit. Thyristor - rectifier module linking arm is made of a thyristor and a r..
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A thermistor (RI) is compared with a reference (R2) in a Wheatstone-bridge circuit. Comparator Ul"s output goes high..
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20W TDA2005 stereo amplifier for all suitable applications like amplifying medium power speakers. It is suitable for car use but before, the power supply must be choked with at least 150mH and it must give up to approximately 6 to 7 amps during the upstream....
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TDA2005 car audio amplifier circuit diagram electronic project using few external electronic parts..
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Will LC-based oscillator be able to show performance comparable to crystals in such conditions (probably in wierd variants like LC-opamp. so that any energy loss on each stage is recovered and we are getting narrower bandwidth) Look at some of the amateur....
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A remote control light switch that fits into the existing light switch panel. And to power up the electronics that would requires a 3. 3V DC supply. The problem is, the panel has only two wires inside - 1. Live and 2. wires that goes to the light bulb. The....
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This small circuit transmitter processes the signs of audio of a sound table or microphone, and the signs of video of a camera, or still the audio signs and video of a DVD, Video-cassette or even it sweats her video plate has an exit of composed video, you....
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This small amplifier circuit is ideal for boosting small audio units...
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Trying to figure out why I`m getting hard shifts on low throttle positions. I have a couple questions as I found some components not holding vacuum. I`....
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In video systems it is frequently necessary to remove the
sync pulse from a video signal, while passing the active
video information. A familiar application for this is the scrambling
of premium channels by cable operators so that they
may only be viewed....
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This circuit is a circuit diagram mini amplifer. This amplifier circuit has a power of 10 watts. This amplifier circuit is very suitable to apply to your car audio. This amplifier using IC TDA2009A, as amplifeir power. To avoid excessive heat in the IC using....
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If you have evered to use Flasher Relay 12V systematic usual mechanical , for general automobile. Today we try to come to build Circuit Flasher Relay 12V , use...
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The head will be powered by servomotors and will be built from sheet plastic, metal or plywood. The template which can be used for cutting sheet material can be found at the end of this article. Download the template, compare the size of the printed....
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It uses the HL-169B-type voice alarm IC A. It can be used for safe, glass doors, car doors and windows burglar alarm and other occasions. When the thieves beat with violence such items that vibration of the piezoelectric ceramic sheet A, crystal thyristor V..
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Ticking Bomb sound generator circuit diagram. The circuit gets going by charging the 2. 2uF and when 0. 65v is on the base of the NPN transistor, it begins to turn on. This activates the BC557 and the voltage on the collector increases. This forces the small....
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This circuit provides a linear increase of frequency of 10 Hz/°C over 0-100 °C and can thus be used with logic systems, including microprocessors. Temperature probes Ql Vbe changes 2 mV/°C. This transistor is incorporated in a constant current source....
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This is a 50 Watt Audio power amplifier circuit based single IC STK4036II. Use heatsink to prevent overheating on the IC. The amplifier circuit will give you good quality of sound unexpensive and have low price. It is easy we make a power amplifier using....
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The circuit in Figure 1 generates 100V from 25V. The circuit is a typical flyback regulator that uses a couple of well-established circuit techniques to handle the high voltage...
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Circuit-delay relay circuit speakers is useful as a delaying / delay on the speaker that functions as a deterrent to prevent pounding of the very first amplifier is turned on. This aims to avoid memperawet speakers easily damaged. The following is a....
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The IC8211 provides the voltage reference and regulator amplifier, while Ql is the series pass transistor. Rl defines the output current of the IC8211, while Cl and C2 provide loop stability and also act to suppress feedthrough of input transients to the....
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This programmer was designed in view of to be flexible, economical and easy to built, the programmer hardware utilizes the standard TTL series parts and no special components are used. The programmer is interfaced with the PC parallel port and there is no....
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Insulated-gate, field-effect transistor (IGFET), Q2 and silicon photo cell Zl form the heart of this circuit. Transformer T1 is an audio-output type, but it"s reversed in the circuit. A sudden flash from a photoflash unit detected by Zl sends a voltage....
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It uses a relay control. The voice switch is characterized by: when the first clap, then through the load (lights); when the second clap, cut off the..
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Explanation Here is a simple 100-watt using IC CD4047 and IRF540 MOSFET of the inverter circuit diagram. The circuit is simple, low cost, or even assemble a veroboard. CD 4047 ..
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When the power supply input to IC1 is the output pin 3 at a frequency of 1 kHz. The frequency is Q1 and Q2, which will continue to use push pool work interchangeably. If this is the positive output signal Q1 Q2 will run the delete function this reason, C2....
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This 3 band equalizer circuit is an active filter network for bass, mid and high audio ranges. It is designed around the LM833 opamp from National Semiconductors. The output of this 3 way graphic equalizer is designed to be DC coupled, however due to slight....