Door bell. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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It is powered by 220 volts.
The sound resembles the sound of an electronic telephone call.
The tone can be adjusted by selecting a 0.05 uF capacitor.
The device uses a DEMSh sound emitter with a winding resistance of 50 ohms. The quality and type of the sound emitter greatly affect the color of the sound and the performance of the system as a whole. Capacitors must be at least 300 volts.
Publication: cxem.net
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