Room Monitor Circuit

  
The circuit uses Ql to buffer the right-channel balance output while Q2 and Q3 form a VOX circuit. When the signal level from the microphone goes high, the output of the VOX also goes high and the multiplexer inside IC1 switches the high-gain left-channel output through to a following buffer stage.
Room Monitor Circuit - schematic

This signal is then ac-coupled via C3 into an RF mixer stage and thence to an RF amplifier, which is tuned by C2 and L2.




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