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I want to make an old telephone handset usable with a phone, aka connecting a 3.5mm jack to it, I have seen some tutorials on this but I have kind of a unique problem. You see normally the handset has 4 wires from what I've seen, 2 for the speaker and 2 for the mic. But mine has only 3, there is a red and green wire connected to the positive and negative terminals of the speaker, respectively. And then there is a black wire which connect the mic to the negative terminal of the speaker in series, the terminal of he mic with like 3 solder strings connect to the speaker and the other terminal of the mic goes is connected to the phone connector. And weirdly the phone connector has 4 pads but since there's only 3 wires, only 3 pads of the connector are being used. Here is a pic of the handset, the wiring diagram and pics of the connector. - (https://imgur.com/a/Oa3L3bf) So now I don't what to do, what 3.5mm jack should I use, as in how many rings should it have? and should it be a mono?( I don't think I have a 3.5mm mono jack, can I convert a stereo one to mono?and how the hell do u wire up this thing to a 3.5mm jack? If someone does help, thank you a lot😊