Musical Doorbell Circuit Diagram. I had to look at it multiple times to understand it and made a couple errors. It is intended for applications such as toys door bells music boxes melody clock timers and telephones.
This featured circuit is a musical doorbell. Connect the input wires on the transformer to the source circuit using the black to black white to white and ground to green method. Wiring diagram for a two chime doorbell wiring for two doors is the same as for one with the transformer hardwired to the 120 volt source from a house circuit.
When s1 is again pressed closed the capacitor c1 stays charged causing the musical bell to play continously.
When s1 is again pressed closed the capacitor c1 stays charged causing the musical bell to play continously. This featured circuit is a musical doorbell. Rewire a few times was simple and these went quickly. The bc547 transistor along with the associated preset and the 100uf capacitor form a simple delay off timer circuit where the preset and the capacitor determines the delay for which the sound output may be sustained once the indicated push button is pressed momentarily.
