Adapting a Telephone Handset to a Cell Phone

Step 6 Solder it All Together

Now that you have tested and verified that the handset works, all that is left to do is solder the correct wires together. The attached table shows the solder connections for this example. Be sure to put your shrink sleeve on the wires before soldering them together, and be sure to put a larger overall (probably black) shrink sleeve on the cord before you solder any of the individual wires together.

Note that we will only use one of the handsfree speaker wires, and that both the speaker and microphone share the same (bare) return wire.

Comments

[Bosun Rick]

I don't know if there's an insrtuctable posted for this, or not; But why not take the innards out of a cell phone, and put them into a regular sized cordless phone? This would make finding the darn thing a lot easier, and maybe the batteries would stay charged up longer too!
It would require a bit more soldering, and probably a giant sized magnifying glass, a case of Rum or Burbon, and 6 months, but it would be cool!