RING BELL ELECTRONIC CIRCUIT USING NE555 DIAGRAM

This circuit produces oscillating frequency around 1kHz, and able to be converted by changing the value of resistor R1. The speaker will produce a long beep sound with 1kHz frequency. Here is the schematic :

Parts list :

Resistor R1 : 10k ohm
Resistor R2 : 56k ohm
Capacitor C1-C2 : 0.01 uF
Polar capacitor C3 : 1 uF/15V
IC timer : NE 555
Speaker : 8 ohm 0.5 W
ON/OFF switch
5-15V Power supply

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