Anyway, these old brutes look good and sound good, but often don't really cut it as a home telephone unit choice. The connection is bad, the numbers are sticky... Time for retirement? NO! Time to show your DJ boyfriend you care about him by making him an extra cool DJ monitoring headset while he's away in New York City!
-An old telephone handset with cord attached
-A soldering iron and some solder
-A mono male phone plug (yes, they are really called phone plugs baby)
-A sharp utility blade
Step 1: Cut the Cord
Now you have a cordless phone and a phoneless cord!
Step 2: Expose Some Wires
You can trim off the black and red wires, we won't be using them here. They carry the signal from the mouthpiece back to the base. You can hook these up to a simple electret preamp and have your own telephone microphone instead.
Carefully remove about 1/8 inch of cable jacket from the ends of the two exposed white wires. Be extra careful because in this case anyway, the wire inside was just this flimsy flat copper coil stuff.
Step 3: Make the Connection
As per the diagram, the speaker ground line will be opposite the red wire and the hot line will be opposite the black. Solder the white hot line to the tip of the plug, and the white ground to the ground. Obviously.