Electronic bell circuit schematic

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A very simple and useful electronic bell circuit can be made using this schematic circuit diagram . This electronic bell circuit can be used as an doorbell or even for an alarm circuit .
This electronic bell circuit use just few transistors and other few common components . The circuit is activated by a resistive touch sensor (S) . The components values can be changed ( the values are not critical ) , but try to use a transistor with high beta factor for a high sensibility .

The used speaker must be a 1W per 4 ohms , if you want to use a speaker with a different power you must change the value of the R5 resistor .
The touch sensor can be buid on a small piece of PCB ( printed circuit board ) or you can use for sensor a keypad from another device like a portable calculator , old keyboard or something else . This bell circuit needs a 9 volts power supply circuit .

Electronic bell circuit schematic with touch sensor

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Electronic bell circuit schematic

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