What is a stereo patch cable, you may be wondering? A stereo patch cable is for connecting two audio devices, to pass the signal from one device to the other. It can be used, for instance, to connect your mp3 player to your car's audio system, if your car comes equipped with a 3.5mm audio input jack. A patch cable can also be used to connect a digital audio player to a pocket headphone amplifier, to boost the signal output (which is what I made this one for). It could also be used to play audio from your phone through speakers or a stereo equipped with a 3.5mm stereo input jack.
Stereo patch cables can be purchased relatively inexpensively online, or sometimes at your local dollar store, but not with such a classic design, or at custom lengths. Plus it's a lot more fun to make it yourself!;-)
I purchased six stereo plugs online for less than $US5, a shoelace for $1, and I found the USB cable on the street. (People often throw away their old printers, and dispose of a perfectly good USB cable with it;-) With these materials, I made two patch cables; one about 6 inches and the other about 2 feet, for about $6 bucks, and I have two plugs leftover. Below you will see pictures from both cables, as the process is the same.
• USB cable (any type will do)
• Stereo 3.5mm plugs
• Heatshrink tubing (optional)
• Wire cutter
• Soldering iron and solder
• Hot glue gun