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Do you know what kind of buzzer would be compatible with this intercom? I tried a magnetic buzzer 3.6VPP but I think that I need a 7VPP to work with that.

Hi. I live in a Condo that uses an old Bitron Video amplifier inside a Mircom box. The headsets are also Mircom. And I know that the audio is not working ( probably an amplifier issue). There is no headset on my appartment, just four wires. I think that wire 1 is ground and wire 2 is...