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Panasonic 616 polarity reverse on payphones.

Started by dsk, January 06, 2024, 03:01:34 PM

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My payphones is made for polarity change when party answers. I want to use them on the lines on my 616.
The polarity change is only needed when the trunk line party answers.

Is it a simpler solution than this (Chematics) when the trunkline changes the polarity a relay will switch the polarity on 2 lines on the 616?