Hi,
I have this somewhat old intercom system in my apartment - simple handset with a buzzer and two auxiliary buttons - one opens the main entrance and one is currently out of use.
For the purpose of training my dog I'd like to commandeer the buzzer, so I can activate it without having someone downstairs ringing my apartment.
I opened up the handset and I couldn't really make any sense of the wiring:
![Hijacking simple intercom system buzzer 2338959-0](https://www.eevblog.com/forum/index.php?action=dlattach;topic=436821.0;attach=2338961;image)
I measured 17V on some of these lines (referenced to what I speculated was ground).
Im not at all familiar with how these buzzers work - I'm assuming it's much like a relay.
My plan was to probe the two terminals on the buzzer and see what signal is coming in when its activated, and then simply apply that signal myself.
However I'm a bit hesitant as I wouldn't want to damage the intercom controller downstairs.
Has anyone done anything like this and can offer advice?
Thanks!