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Electronic siren circuit with two transistor

2016-05-08 19:23  
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Operation of the circuit is Q1 and Q2 will work with R3, R4 and C2 is afrequency generator circuitwith output connected to LED1 and speakers SP1. When I press the switch S1 to the C1 will begin to charge allows the voltage to pin B of Q1 increase other. The Q1 is working and Q2 is working with at the C1 charge full cycle will stop oscillator speaker is not.
The LED1 light and hold the release the pressure switch S1, resulting in C1 will start discharger through R3, Q1 to ground. The oscillator circuit sound Sirens in the lower out. If we press the switch S1 and then quickly leave many. The sound will be as continuous as C1 to charge and discharge alternately continuously.

Electronic siren circuit with two transistor

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