It can convert from 1/8" or 1/4" stereo to either 1/8" or 1/4" mono (with the option to change jack sizes between channels). It can do simple conversion from 1/8" to 1/4" in mono and stereo. It can even split a mono signal into a stereo signal (again, with fully selectable 1/8" and 1/4" conversion options).
It is my hope that I will never need to make another converter again!
Well... until I need two of the same kind.
Step 1: Go Get Stuff
A 14" x 12" sheet of white acrylic.
An awesome Epilog laser cutter
Red and blue acrylic paint
A paintbrush, water cup and palette
A heat gun
Heat protective work gloves
An 18" metal extrusion
A drill with a 1/4" bit
(x2) 3" carriage bolts
(x2) 1/4" nuts
(x2) rubber stoppers
(x6) 1/4" mono jacks
(x3) 1/4" stereo jacks
(x6) 1/8" mono jacks
(x3) 1/8" stereo jacks
(x4) SPDT rocker switches
A DPDT slide switch
A soldering setup
If you don't have a laser cutter, you can use a service like Ponoko
Step 2: Laser Cutter - the Tool of the Future
Using the files below, first make a raster cut with the following settings:
Then make a vector cut with the following settings:
Step 3: Paint
Place it elevated and flat so that the edges don't touch anything and you can pick it up from underneath if need be. I balanced mine on top of my water cup.
Wait for it to fully dry and then peel away the protective coating.
Step 4: Bend
Put on your work gloves. Heat up across the joint (where the board is clamped) until it starts to visibly start to droop a little. Hold the part of the acrylic farthest from the heated edge (the coolest part) and gently and evenly start to bend the entire panel down. Continue bending until the panel is at around 45 to 60 degrees.
Hold it in place until it starts to cool and stiffen and then unfasten it.
Step 5: Install a Stand
Install your carriage bolts into the top corners of the board, fasten them tightly with 1/4" nuts and then screw the rubber stoppers onto the bottom.
Step 6: Jack It
This means, removing the nut from the threading, pushing the threading through from the backside and then refastening the nut. Easy!
Step 7: Wire It Up
Wire it up using the following schematic.
Unlike me, be careful to pay attention while you do it so that you don't wire everything wrong and realize halfway that you have to redo all your work.
One you are done soldering, you are ready to start converting.