Police bicycle siren circuits

  
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This circuit is the sound generator super siren, for use be alarm signal get by live frequency generator circuit that use, op-amp circuit. The principle works to are while still no press switch S1 will still have no the loud sound comes out from a loudspeaker SP1. When do pressure switch S1 then liberate C3 do something charge full until while press switch S1
Police bicycle siren circuits - schematic

and discharge go out. When liberate switch S1 come in at R7. Which perform in something limit current come in at 3 Non inverting legs of IC1a. By IC1, D1, D2, C1, C2 and R5 build be sound generator signal circuit then export come to way pin 6 of IC1a come to reach at pin 3 (Noninverting) of IC1b. By have R1 and R2 build be Dectector circuit. For do fining level has signal then signal to come out the way pin 7 of IC1b which will have flowing through comes in at pin B of Q1 for do something bias give Q1(BC639) bias. When Q1(BC639) work then make SP1 make a noise loud come out and make a noise poor loud C3 discharge be finished SP1 then stop make a noise loud.



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