Category: Circuits

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Zener diode and Voltage regulator circuits

Zener Diode The zener diode is a type of diode which operates under reverse bias that breakdowns when the applied voltage reaches a particular reverse bias voltage or knee voltage. It allows the current...

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Door opening alarm circuit diagram

A door opening alarm circuit is an indicator or a security alert device which activates while opening the device attached door. And the alarm remains ON as long as the door is kept open....

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Simple touch switch circuit using transistor, 4017, 555 IC

A touch switch circuit operates with a touch action of an object or sensible material. It is used in hobby devices to high end consumer electronics for various applications. Touch switch circuit using transistor The...

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Audio Tone generator circuit using 555, 741 IC

A tone generator circuit can be used for various applications such as alarms, bells, indicators, etc. A tone generator consists of a square, triangle, saw tooth periodic wave generator circuits, commonly square wave generators. Such periodic...

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Automatic Light Control Circuit diagram using LDR

These circuits can be used for different automatic light sensing projects including automatic night lamp, automatic street light controller, dark sensor circuits, etc. Automatic night lamp circuit using IC 555 An automatic night light circuit...

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Rectifier – Half wave rectifier and Full wave rectifier

A Direct current flows only in one direction, which means it has a constant polarity across its terminals. Where an Alternating current periodically changes its direction of the current, that is an alternating polarity at the...

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Brake light flasher circuit

Simple flashing brake light The circuit can use to make a simple pulsating stop brake light which continuously flashes as long as the brake is applied. Here we are using a 555 astable multivibrator...

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UM66 IC Melody Generator circuit

The given melody generator circuit is built with musical IC UM66. A melody generator using um66 is very inexpensive and simple to assemble. The circuit can be used as a doorbell, musical alarm, musical...