Category: 555 circuits

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Automatic night lamp circuit using LDR and IC 555

This circuit can be used for different automatic light sensing projects, including automatic night lamp, automatic street light controller circuits, etc. An automatic night light circuit controls the switching of light by sensing the...

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Alternate light flasher circuit – Dual LED

This alternate LED flasher consists of a pair of LEDs which blink alternately. It has the same circuit of a simple LED flasher circuit using a 555 astable multivibrator. The only difference is that...

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Continuity tester circuit using 555

A continuity tester is a device used to determine the existence of an electrical connection between two points. It consists of two testing probes which will be connected to end contacts in the circuit....

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LED strobe light circuit – Police lights

Strobe lights are commonly used as emergency vehicle lights for visual warnings. Their light effects are similar to the flashing light in police vehicles, ambulance, beacon light bars, etc. The given strobe light circuit...

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Flashing brake lights for motorcycles

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

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Automatic battery charger with LED indicator

Here the circuit for a 6V automatic battery charger which has overcharge protection with LED indicator and current limiting feature. The circuit regulates the charging of the battery by taking feed back of the voltage...

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Infrared security alarm circuit DIY

This infrared burglar alarm can use at doors, entries, etc. To alerts us, when somebody crosses through the IR beam. As the IR beams are invisible to human eyes, the circuit can work as a hidden security device. To...

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DC Voltage doubler circuit

Here the circuit for a voltage doubler or DC to DC converter using a 555 IC. The circuit consists of an astable multivibrator circuit which generates a square wave at the output terminal 3,...

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Tone generator circuit using 555

The tone generator circuit can be used for various applications such as alarms, bells, indicators, etc. The circuit consists of an astable multivibrator circuit using a 555 timer IC. It generates a continuous square wave...

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LED flasher circuit using 555

An LED flasher circuit can be used as LED blinker, vehicle indicator light, signal flashlight, etc. A simple blinking circuit is basically a circuit to continuously ON and OFF the light supply on a...