The microwave burglarproof alarm circuit

Published:2011/6/27 21:24:00 Author:Borg | Keyword: microwave, burglarproof alarm | From:SeekIC

In the figure is the microwave burglarproof alarm circuit. This circuit consists of the simulated sound integrated circuit IC(CW9561), the LDR (MG45), the transistor and the power supply, etc. The alarm is installed in the closable room where there's some light, if the room is closed, the LDR will be in a high resistance because of no light, which makes the transistor BG2 blocked, so the simulated sound integrated circuit CW9561 is power-off, IC is not working, accordingly, the loudspeaker is silent. If the room is open, the LDR is in a low resistance due to the light.



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