Yup, the speaker was also the microphone.Does anyone happen to know how the old archer wired intercoms transmitted?
I don't see any kind of mic on the board.
I just replaced all the caps and have it working on the receive side of the master control, I can page with the buzzer but don't have voice transmit to the satellite units.
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The speaker needs to be fairly stiff to work well. The fiberboard May have become quite "soggy" over the years which means they move a bit but the audio power of your voice may not be transmitting to the voice-coil of the "microphone" to generate a signal. A thin layer of varnish can crisp them up.If your not transmitting voice audio but receiving it try cleaning the contacts in the talk/transmit switch.
I'm still using one I've had for years, can't remember what make it is as it doesn't say - but I've certainly had it more than 30 years, it's never failed, and I can't say I can remember ever changing the battery?, but I suppose I must have at sometime?.Great bits is right! Such simplicity and reliability in a small package, well worth repairing.