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4A speakerphone 680A Transmitter / 108A speaker schematics?

Started by 5415551212, April 25, 2021, 06:43:35 PM

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Greetings all I am looking for some circuit schematics for the
680A Transmitter / 108A speaker.
I found BSP 512-700-100
Specifically looking for what wires do the on/off and volume so i can run the speaker without a 680A.
I see terminal 18 is volume
And on the 108A I see that leads to a transistor.
But whats the range?
0-+6.2V or 0- -6.2


Thats exactly what I was searching for on that very site and could not find.
Thank you.
You guys are awesome!