Le scénario
A visitor presses a momentary doorbell button, closing the low-voltage AC secondary loop and energizing the chime; releasing the button opens the circuit and silences the bell.
Ce que contient ce dessin
Comprenez les décisions qui le sous-tendent.
01
Use a transformer to step down mains to safe low voltage
02
Place the push button in series with the chime on the secondary side
03
Use a normally-open push button so the bell rings only while pressed
When designing or troubleshooting a residential hardwired doorbell with mains isolation and a momentary push button.