Doorbell from a musical postcard. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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During my amateur radio practice, I have collected several call patterns. The most interesting was the call on the K155ID10 decoder with a melody programmed by resistors. After some time, an idea arose: "Why not develop a call scheme yourself?". Moreover, a fair amount of old musical postcards had accumulated at home, and there was plenty to choose from.
The project is not difficult. The call consists of 3 main modules: a power supply, a button retention circuit, a postcard scarf + a power amplifier.
The following parts were used in the circuit: transistors KT315 (4 pcs.), KT816, KT817, KT602BM (2 pcs.), D220 diode, D814 zener diode, diode assembly, 4 electrolytic capacitors, 8 resistors, RES22 relay, network transformer. In the power supply, you can use 12 V stabilizer microcircuits. You can also power the postcard circuit through a quenching resistor from a network power supply unit. You can make two connectors on the case: one for connecting 220 V power, the other for wires from the button - it will be easier to service the call and change the battery in the postcard. By selecting R2 and C1, you can adjust the duration of the melody.
Publication: cxem.net
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