Photoelectric alarm circuit diagram

Published:2011/4/19 22:33:00 Author:Rebekka | Keyword: Photoelectric alarm | From:SeekIC

When light beam I1 and photocell between the PC1 are truncated, they will start the alarm circuit resulting in a special scanning a single audio signal. This signal is sent to a simple amplifier with amplified speakers. It will make an alarm signal. When the light I1 is truncated, PC1 resistance will become larger, SCR1 will be turned on, so that the negative power supply terminal B1 and the circuit in the back of SCR1 can be connected. Q1, Q3 are two single-junction transistor. They are used as oscillator components in the circuit. R3, C1 determine the oscillation frequency of Q1; R3, C3 determine the oscillation frequency of Q3; Q2 for amplification. The light and the photocell of the circuit can be placed on the door or window of the opposite sides of the mirror to collect light in the room.



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