I went down to the Really Good Stuff vintage shop in Southeast Portland and picked up an old telephone handset. It took less than an hour to wire it up to work with my iPhone. The handset has a button built into the handle that now performs the same function as the button on the microphone on the standard iPhone headset. (answer, release, play, pause, voice commands, etc.) I was able to use the original microphone and speaker, so the sound quality is awesomely ’50s. Leaving the original microphone and speaker intact also preserves the handset’s pleasing balance and weight.
A bit more info for do-it-yourselfers.
You’ll want a 3.5mm 4 conductor cable. If your handset already has a cord that you wish to use, you might just get the plug end to finish your existing cable. Otherwise, get a finished cable and strip bare the necessary wire ends.
The correct 3.5mm plug will have 4 conductors separated by 3 black rings. Starting from the tip and moving toward the base, the conductors are 1, 2, 3, and 4.
|Pin Number||Pin Name||Description|
Your speaker will have two terminals. Wire one terminal to pin 3 (ground), wire the other to both pins 1 and 2 (left and right signal). Your microphone will also have two terminals. Run the ground of the mic to pin 3, and run the signal for the mic to pin 4. If your handset has a button which you wish to use to mimic the functionality of the button integrated into the mic on the iPhone earbuds, wire that button so that it will momentarily connect pins 3 and 4.
This should be all the info you need to create your own handset. Every other detail will vary based on the particular handset that you wish to modify. A circuit tester will be useful to make sure you have the speakers and microphone wired to their correct conductors on the jack. Good luck.