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A visitor presses the doorbell button, energizing the astable multivibrator, which oscillates and drives the speaker to produce a ringing sound.
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01
Using a two-transistor astable multivibrator for a self-oscillating tone without an IC
02
Placing the pushbutton in series with the battery to power the circuit only when pressed
03
Coupling the speaker through a capacitor to avoid DC bias
When building a simple, low-cost electronic doorbell or call alert using discrete components.