Аудио и видеонаблюдение

Схема вызывной аудиопанели AVC-305

Схема вызывной аудиопанели AVC-105

Doorphone intercom (ENGLISH)

I have had the pleasure of working  with Mr Laurier Gendron of Burnaby in British Columbia, Canada to make this circuit. Please make sure you visit Lauriers web site, Handy Dandy Little Circuits. In our doorphone circuit, an 8 ohm speaker is used both as a microphone and also an output device. ...
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