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| dual usb charger | |
| Siren Circuit |
| This circuit will generate siren sound when S1 pressed and increate sound frequency becuase capacitor C1 charged when switch S1 released the frequency will decreated(C1 discharged). Try to change resistor R3 if you need to change time interval from low to high frequency and vise versa.  Siren circuit 2N2222 data sheet Data sheet in pdf file format. This is a 2N2222 from Fairchild semiconductor. 2N2907 data sheet Data sheet in pdf file format. This is a 2N2907 from Fairchild semiconductor. |
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