ANTI-THEFT SECURITY FOR CAR AUDIOS

May 15th, 2015
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This small circuit, based on popular CMOS NAND chip CD4093, can be effectively used for protecting your expensive car audio system against theft. When 12V DC from the car battery is. Whenever an attempt is made to remove the car audio from its mounting by cutting its connecting wires, the optocoupler immediately turns off, as its LED cathode terminal is hanging.

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Anit Thet Security for Car AudiosCIRCUITIDEASANTI-THEFT SECURITY FOR CAR AUDIOST.K. HAREENDRANEDI DWIV S.C.This small circuit, based on popular CMOS NAND chip CD4093, can be effectively used for protecting your expensive car audio system against theft. When 12V DC from the car battery isWhenever an attempt is made to remove the car audio from its mounting by cutting its connecting wires, the optocoupler immediately turns off, as its LED cathode terminal is hanging. As a result, the oscillator circuit built aroundapplied to the gadget (as indicated by LED1) through switch S1

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