Brain dead reverse-engineering

When gutting the phone, I went to the trouble to preserve the hook and PTT switch infrastructure. I’m still not sure how I’m going to use them, but I figure that it’d be good to know how they work.

With the help of my trusty cat Ezra, I carefully stripped the end of all the wires, and used the continuity tester on my multimeter with some clip leads to measure what they all did.

Not that any of you care, but if you want to know how they mapped, it’s below the break.




The PTT switch is a simple SPST leaf switch, and it serviced by the lighter and separate green and red wires.

The hook switch an ugly set of leaf switches, but the effect is a DPDT switch.

Off-hook Right Left
COM Grey Blue
NO Yellow Black*
NC Red Green

* – This connection is a little noisy, and probably shouldn’t be used.

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