Category: 555 circuits

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Police strobe light led flasher circuit with 555

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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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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Automatic battery charger circuit 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 diagram

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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555 led flasher circuit diagram

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...

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Beeper circuit using 555 timer IC

Here the circuit for a simple Beeper alarm using 555 IC, which generates a Beep-Beep tone. This tone generator circuit is suitable for indicators, emergency alarms, etc. The circuit consists of two astable multivibrator...

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Power failure indicator circuit using NE555 IC

Here the circuit for a power failure indicator, which can be used along with any other device to detect a power outage. The circuit uses an external 12V DC for checking the presence of a...

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Voltage controlled oscillator 555 VCO circuit

Voltage controlled oscillator (VCO) is a circuit, which varies its frequency of the oscillation with respect to the externally applied voltage. The VCO circuit can obtain a linear variation of oscillation in relation to the input...

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Auto power cut off timer circuit

An automatic timer switch turns OFF a load itself after a fixed period of time. The circuit will be useful for various devices which we forget to turn OFF such as light, alarm, indicator circuits,...

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Police siren circuit using NE555 timer

The wailing siren can be used as a tone generator, indicators, alarm, etc. The circuit consists of two astable multivibrator circuits using 555IC, one with (IC 1) low frequency and other with (IC2) high...