LOW acoustic-optical siren circuit

Published:2012/10/28 21:02:00 Author:Ecco | Keyword: LOW , acoustic-optical siren | From:SeekIC

The circuit can generate high intensity warning sound, and it can be used as anti - theft siren. When power alarm system is connected, VD1 flashes and eimts light, R1 resistor outputs pulse square wave which is converted into triangle wave after passing R2, VD2 and C1 network, IC is a 555 time-base circuit to form a voltage-controlled oscillator. R3, R4 and C3 are timing elements. Under the control of the triangular wave, the output variable tone signals is amplified by VT to promote speakers, and its output power closes to l0W. Adjusting R1 can change the amplitude of the triangle wave on C1, and adjusting W1 can change the volume. Figure (b) is a printed circuit board installation diagram.



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