lOW sound and light siren circuit diagram

Published:2011/5/6 4:24:00 Author:Ecco | Keyword: lOW, sound , light s, iren | From:SeekIC

lOW sound and light siren circuit diagram is shown as the chart. The circuit can produce high-intensity alarm which can be used as anti-theft alarm. When the power is switched on the alarm system, VD1 is flashing, while it outputs the pulse square wave on R1 resistor, after gets triangular wave by passing R2, VD2, C1 network, IC is a 555 time base circuit, and it forms voltage-controlled oscillator. R3, R4 and C3 are the timing components. The output variable tone signal is amplified by the VT under the control of the triangular wave to promote the speaker, the output power closes to l0W. Adjusting R1 can change the triangle wave amplitude of C1, changing W1 can adjust the volume. Figure (b) is printed installation diagram.



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