Musical doorbell circuit with two trigger modes

Posted on Mar 28, 2007

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
Click here to download the full size of the above Circuit.

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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