Musical doorbell circuit with two trigger modes

L a few custom IC 66} began to slow music. When the song ends, no electricity flows through the thyristor, the thyristor then cut straight in the light once again shines on the phototransistor Bu [I a mountain. Roundworm parallel Tiao Ping] I XsJ, people hang block
Musical doorbell circuit with two trigger modes - schematic

touchpad, just "to have every touch, its population will be out of a trigger pulse thyristor rectifier car, J fork issue is music, therefore, the same circuit can be light or tip sheet l touch to make it work. button to open the circuit can cry Sl 1 normal state, the push-button F, the doorbell made mountain music.

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