O cenário
A visitor presses the doorbell button, energizing the astable multivibrator, which oscillates and drives the speaker to produce a ringing sound.
O que há neste desenho
Entenda as decisões por trás dele.
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.