Repository-circuits
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50 Hz 60 Hz frequency generator circuit using crystal oscillator You can generate 50Hz or 60Hz using this frequency generator. This oscillator.... -
555 Negative Voltage Power Supply Circuit A negative supply can be generated by a ""Charge-Pump"" circuit created with a 555, diodes and.... -
555 Timer Time Delay Circuit LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SW2, makes.... -
555 Timer With Audio Alarm Circuit Here is a very simple circuit for electronic timer with audio alarm. With the help of this circuit, audio.... -
555 Variable Frequency Square Wave Generator This simple 555 Variable Frequency Square Wave Generator produces a variable frequency output of.... -
This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network,.... -
741 Stereo PreAmplifier Circuit Diagram This preamp circuit provides better than 20dB gain in each channel. PARTS LIST R1 -.... -
Accurate 50Hz Oscillator Circuit Using 555 And 7490 This circuit is a getting a 50Hz pulse. It comprises a 555 timer and two 7490 divide-by-ten.... -
This microphone preamplifier incorporates automatic gain control, which keeps the output level fairly constant over a wide range of input.... -
A portion of the op amp`s output signal is rectified by the 1N4148 diodes, then filtered and fed to the gate of the FET input shunting circuit. As the output rises, more and more input shunting takes place. That is, more of the input signal is bypassed,.... -
12V Battery Charge Nominal Discharge (Low) Indicator Circuit This circuit monitors car battery voltage. It provides an indication of nominal.... -
Capacitance Meter Circuit Using 555 It directly reads capacitance in the range 100pF to 10µF. IC1 and IC2 operate as an astable (with frequency.... -
Good pitching beats good hitting and a good magnetic mic beats a good carbon mic. This one transistor carbon mic converter takes a carbon mic input and converts it to the magnetic variety. Note that no ground connection is used, even if the circuit is built.... -
CD4060 Timer Circuit 1 minute to 2 hours This is a 1 minute to two-hour timer switch. The 14-stage binary ripple counter Type 4060, IC1, has an.... -
Discrete Class AB Transistor Audio Power Amplifier Circuit Diagram This is a class AB transistor power amplifier. It is a simple amplifier to.... -
Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit This is a simple Colpitts crystal oscillator for 1 to 20 MHz, PARTS.... -
need often arises for a sensitive sound pick-up device, whether it is to be used as a simple microphone or a more exotic device as a sound operated alarm, a bugging device or a sound operated flash (for stop action photography) the list is quite unending..... -
Crystal Controlled Oscillator Circuit This general purpose signal source serves very well in signal-tracing applications. The output level is.... -
CXA1019 FM RADIO CXA1019 is a one-chip FM/AM radio IC designed for radio-cassette tape recorders and headphone tape recorders, and CXA1019S has the.... -
This circuit can control direction of a DC motor. This can operate the motor in both directions (Bi-direction) Clockwise and Anticlockwise (forward and back) .. -
Electronic Coin Toss Circuit Diagram This is electronic coin toss circuit using one CD4049 IC (Hex inverting buffer and TTL driver). This IC.... -
Filament Light Dimmer Circuit This simple triac dimmer can be used to control incandescent filament lamps up to 200W. The circuit operates on.... -
First Response Monitor, Input Selector, Game Circuit You can find first response using this circuit, because it helps many response monitor, games.... -
Fluorescent Tube Light Circuit of an inverter that uses a single transistor and a single transformer. This type inverter can be made in various.... -
This FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. (Only C2570 is annotated on the transistor body. ) Input coil L1.... -
HeadPhone Amplifier OR PreAmplifier OutPut Stage This 1 watt amplifier lends itself par excellence for use as driver for low impedance headphone.... -
In Circuit Transistor Tester Schematic Here is a circuit that can indicate the condition of a transistor by using two LEDs. A good NPN transistor.... -
Infrared Remote Control Switch Circuit Remote controls, specially cordless type, are very popular nowadays. Here is a simple and.... -
Infrared Remote Control Tester Circuit This is a simple circuit you can build in order to test infrared remote controls. The circuit uses an.... -
L200 12V Constant Voltage Battery Charger Circuit This battery charger is based on L200 regulator IC. L200 is a five pin adjustable voltage and.... -
L200 Power Supply Regulator There are applications in which it is important for the supply voltage to be largely independent of the level of the....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
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.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
Popular Circuits
Very simple and useful circuit for communication between two person. The Q1 is used to amplify...
LM13700 VCAs are used in a configuration identical to that shown in the Nat Semi data sheet that...
Just to prove that transistors can also be useful in logic situations; this is a data latch and...
The input signal is amplified by the transistors. The distorted output is then clipped by the two...
This simple circuit will oscillate with a wide range of crystals. Connect several different...
This circuit is used to sense the insertion of a penny. Before the penny is inserted, current is...
Many electric cars are able to convert the momentum of the car into stored energy in batteries,...
This volume controller equalizer electronic project is designed using LM1036 DC tone volume...
The ISL62381, ISL62382, ISL62383, ISL62381C, ISL62382C and ISL62383C family of controllers...
DTL internal structure shown in the inverter circuit (M5936P) is. Inputs with diodes, transistors...