Loud 10-W Car Alarm Siren

August 1, 2012 Rend 0

This alarm generates square-wave output that sweeps down and up in frequency, producing force field of high-intensity sound inside car, building, or your other properties. […]

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One Direction Motion Sensor

May 23, 2011 Rend 0

This is a one direction motion sensor circuit. This motion sensor circuit is used to detects an object passing in one direction, ignoring an object […]

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555-IC Timed Beeper/Alarm

February 24, 2011 Rend 0

This is a simple circuit of beeper using 555 timer. This circuit can be employed to energize lights, horn, or other signaling device at any […]

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Simple Code Lock

June 12, 2010 Rend 0

This is Simple Code Lock circuit. This circuit will turn on a relay when the 8-way DIP switches receives the correct code.  Here is the […]

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Siren Driver Circuit

March 23, 2010 Rend 0

This is a driver circuit for siren. This circuit usually used for car alarms. To build this circuit, we use VD-MOS FETs. This circuit receives […]