Electronics Project Circuit For You

An interesting circuit of a bicycle horn based on a popular, low cost telecom ringer chip is described here. This circuit can be powered ...

Nowadays a lot of intercom units are equipped with video cameras so that you can see as well as hear who is at the door. Unfortunately, th...

This circuit senses AC audio voltage supplied to the car-radio loudspeakers and displays it as power using a LED bar graph , achie...

Many Metex DVMs feature a serial interface (RS232) which enables measured values to be copied to a PC for processing. Although this works ...

Interesting, surprising as well as scientifically useful visual effects can be obtained by employing colored LEDs instead of the normal la...

This circuit does the exact opposite of what most of this type of changeover switches attempt to do. Usually a changeover switch is used w...

This hybrid DRM receiver with a single valve and a single transistor features good large-signal stability. The EP95 (US equivalent: 6AK5) ...

We recently bought a train set made by a renowned company and just couldn’t resist looking inside the locomotive. Although it did have an ...

One way to extend the operating life of incandescent lamps is to reduce the voltage across the lamp by connecting something in series with...

Completely ‘self-supporting’ garden lamps using solar cells as their energy source are gradually becoming more and more common. How do the...

This mini pocket torch combines the advantages of Lithium button cells with a super-bright white LED. The lithium cells are small, have a ...

We have already published designs that use a transistor junction operating in Zener breakdown as a noise source. Anyone who has experiment...

This fan controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap opamp as the amplifier. The circuit designed fo...

The losses in a bridge rectifier can easily become significant when low voltages are being rectified. The voltage drop across the bridge i...

A flashing LED signals the necessity to water a plant, 3V powered circuit This circuit is intended to signal when a plant needs water. A L...

Here is a simple but inexpensive inverter for a small soldering iron (25W, 35W, etc) In the absence of mains supply. It uses eight tra...

Flashing 13 LED unit, 3V supply, Also suitable for jogger/walkers This circuit has been designed to provide a clearly visible light , form...

Two strips of LEDs fading in a complementary manner, 9V Battery-operated portable unit This circuit operates two LED strips in pulsing mo...

LED sequencer: follows the rhythm of music or speech, 9V Battery-operated portable unit The basic circuit illuminates up to ten LEDs in se...

Here is portable, simple and inexpensive unit white-LED-based emergency light that offers the following advantages. 1-It is highly bright ...