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Emergency Siren Simulator Using 2N4401 And 2N4403

2017-09-08 15:05  
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Emergency Siren Simulator Using 2N4401 And 2N4403

When the pushbutton is depressed, the frequency of oscillation climbs to a peak and when the button is released, the frequency descends due to the rising and falling voltage on the 22 uF capacitor.