Burglar alarm circuit composed of photodiode

Published:2012/8/19 22:36:00 Author:Ecco | Keyword: Burglar alarm , photodiode | From:SeekIC

The alarm is mounted in a drawer. If the thief opens your drawer at night, the alarm will send the souud of ow - ow to warn thieves, and they will dare to start. Photosensitive diode VD, transistor VT1 and resistor R1 form a light control switch; integrated circuit IC, transistor VT2 and speaker YD form the alarm circuit. IC uses the KD-9561 four-tone analog alarm audio Manifold. VT1 and VT2 select 3DG201 silicon transistor with β value being greater than 60. VD selects 2CU photodiode. R1 and R2 use 1W carbon film resistors. YD uses 2.5 inches of electric speaker with impedance in 8Ω. Power select 3 and 5 battery. K selects small, self-resetting and normally closed contact button switch.



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