Repository-circuits
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Remote control circuit consists of two parts, one is the transmitter and the other is the receiver. A simple schematic diagram of the remote control. IC transmitter transmitter circuit is controlled by NE555. Receiver circuit works by the frequency of the.... -
The Passive Aircraft Receiver is basically an amplified "crystal radio" designed to receive nearby AM aircraft transmissions. The "passive" design uses no oscillators or other RF circuitry capable of interfering with aircraft communications so it should be.... -
Here is a solar charger circuit to charge Lead Acid or Ni-Cd batteries using solar energy. The circuit harvests solar energy to charge a 6 volt 4. 5 Ah rechargeable battery for various applications. The charger has Voltage and Current regulation and Over.... -
Most of the beginners in digital electronics assume that the hanging input is a logic 0. Then, that`s a misconception. They are neutral state which can be a logic 0 or a logic 1. This will bring chaos on your circuit operation. As you can see, in each case.... -
In designing logic circuit, it is sometimes necessary to compare values of two digital data. In this case, creating your own magnitude comparator can cause you more logic IC and can consume more time and money. This magnitude comparator IC might help you. It.... -
In most digital electronics projects that uses different kinds of switches, switch bounces are commonly encountered. These are extra glitches after the real switch operation. These are tiny pulses that affect the actual operation of the circuit like.... -
This circuit is a real gem! Easy to make and more sensitive than many commercial devices available. It`s based around an LF351 low-noise operational amplifier and a 1mF choke acting as the sensor. Unlike most other simple EMF detectors, this one has a meter.... -
One of the most useful gadgets a video enthusiast can have is a low-power TV Transmitter. Such a device can transmit a signal from a VCR to any TV in a home or backyard. Imagine the convenience of being able to sit by the pool watching your favorite movie on.... -
This security system is very important for any kinds of home, office, factor. there has a circuit diagram its simple and easy to build. Any one can do it. It`s a low cost circuit diagram. Many security systems use a closed loop of wires and switches arranged.... -
This design fulfills these requirements by means of a variable gain microphone preamplifier built around IC1A, a variable steep Wien-bridge pass-band filter centered at about 1KHz provided by IC1B and an audio amplifier chip (IC2) driving the loudspeaker. 1).... -
For making use of this facility, the calling subscriber is required to initially dial the normal phone number of the called subscriber. When the call is established, no ring-back tone is heard by the calling party. The calling subscriber has then to press.... -
Notes: The frequency of the transmitter lies within VHF and VLF range on the TV channel, however this circuit has not been tested at UHF frequencies. The modulated sound signal contains 5. 5 -6MHz by tuning C5. Sound modulation is FM and is compatible with.... -
This Circuit needs a adapted 10V-DC advanced end able of bartering 2 Amps. Starts the allegation aeon at 240mA and at abounding allegation switches automatically to a float action (trickle charge) of 12mA. The capacitors are the bowl 50V (or better) type..... -
Figure 1 shows the 10. 58 to 10. 74 MHz VFO oscillator circuit. Yes, this is the same circuit that was presented last, but I`ve re-designed to show the Colpitts oscillator more clearly. "L" is approximately 1. 5 uh, 19 becomes a core T50-6 (yellow). The.... -
This 220 Volt disco lamp circuit is not a voice switch (VOX), because this circuit is too dumb to differentiate between musical sound and human voice. This is more of a voice-activated sound activated. An interesting application is to control the lighting in.... -
This preamplifier was designed to cope with CD players, tuners, tape recorders etc. , providing an ac voltage gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets,.... -
This circuit uses just two CMOS IC`s, a 4011 quad 2 input NAND gate, and a 4020 14-stage ripple binary counter. At switch on R2 and C2 provide a brief reset pulse, which will ensure the output pin Q1 of the 4020 is high. Gates U1 and U2 form a simple astable.... -
A simple astable timer made with the 555, the mark (on) and space (off) values may be setindependently. The timing chain consists of resistors Ra, Rb and capacitor Ct. The capacitor, Ct charges via Ra which is in series with the 1N4148 diode. The discharge.... -
The metal detector shown here may well represent a new genre. At any rate, after some exposure, it is regarded as such by those who have seen it. It is based on a standard transformer coupled oscillator(TCO) - hence the name Coil Coupled Operation (CCO).... -
Using a dual polariity power supply (+-5V works fine) will cure most clipping problems. You will have to check the data sheet for the correct pins to connect your voltages. .. -
This circuit uses a conventional spring loaded mouse trap, available from hardware stores. However when a mouse is caught, the circuit triggers and transmits an interrupted tone on the commercial FM band to a nearby radio receiver. This circuit is a small.... -
This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detectmetal wiring if it conducting ac.... -
As many or as few channels as are required can be added to the mixer. Do this by just duplicating the input "sections" which are clearly shown on the schematic. One version of this mixer I saw had 25 inputs! .. -
The circuit is a standard RC phase shift oscillator using a single bipolar transistor as the active element. When power is applied regenerative feedback is applied via C2 from collector to base of the transistor. The timing components, R1, R2, C1 and C3.... -
The signal sources in the analog output stage of the PC SVGA card see the right impedance - 75 ohms on each line (five resistors), and the input impedances of the transistors are so high that they do not make any significant additional load. The transistors.... -
The first thing that you must do, is to measure the end transistors (T3 and T4) amplifying coefficient, the hfe or ². If their disagreement is bigger than 30 %, the amplifier would not give a clear sound. I used MJ3001 and MJ2501 transistors, and this.... -
This timer circuit is similar to the 5 to 30 minute timer except that when switch S1 is closed, the on/off actionof the circuit will continue indefinitely until S1 is opened again. A 7555 time and low leakage type capacitor for C1must be used. The 6 way.... -
This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days.... -
This timer is based on a simple Monostable Circuit. The length of time the relay remains energized - the ON period - is controlled by the values of R3 & C2. And the length of time the relay remains de-energized - the OFF period - is controlled by the values.... -
This circuit uses a Cmos 4017 decade counter to create a sequence of four separate events. The number of events in the sequence may be increased to nine or ten. And the length of each event is controlled independently. You`re not limited to a series of -.... -
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.... -
This is a small general purpose audio test set. It comprises a low 0. 3% distortion phase shift oscillator and a level meter. The level meteris set at 100mV FSD and can be used for gain measurements and general testing. Current consumption is just under 4mA.....
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
Most of the CDROMS available have an Audio-Out Output to either plug in the headphones or connect...
This circuit simulates the sound of an American police siren. IC2 is wired as a low frequency...
This free-running TTL square-wave oscillator has a variable frequency output over a 20:1 range or...
This accessory connects to phone and will activate an attention-getting 120-V bell whenever a...
Building a serial voltage meter to measure from 0 to 5 volts DC is actually pretty easy. Using...
Oscillator Cores (cClappCore, cHartleyCore, cModifiedClappCore, and cModifiedColpittsCore) are...
As shown is composed of 555 motor automatic governor circuit. The circuit composed of flip-flops...
Both transistors are low noise types. In the original circuit, I used BC650C which is an ultra...