Simple Siren Circuit

This Simple Siren circuit will generate siren sound when SW pressed and increate sound frequency becuase capacitor C1 charged when switch SW released the frequency will decreated(C1 discharged).


We can get various frequency sound by changing Resistor values. Advandage of this circuit:

1. Low cost

2. Easy to construct

3. can use as security system

4. it will run in 9V Battery

5. Small in size

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