This is a simple 3 line breakout board. It's labeled for installing multiple pro-sound mods into a Game Boy. It can be fairly difficult to solder multiple wires to one point so this splits them up into multiple solder pads.
You can use this to install up to 3 different pro-sound jacks into your Original Game Boy(DMG).
This panel measures approximately 3/8" x 1/2" (8mm x 14mm) wide and 1/16" (1.6mm) thick.
There are four set of three through-hole solder pads. Choose any one of these sets of three and solder wires to the pads(you may want to color code them with 3 different colored wires so you don't mix up your lines).
Check the 2nd picture. Solder G to Ground.
If you want volume control then solder L and R to Left and Right(post pot).
If you do NOT want volume control and a slightly louder signal then solder L and R to Left and Right(pre pot).
From here you can can solder an 1/8" jack, a quarter jack and RCAs for installing into your DMG!
*this will work with any Game Boy or any other audio device with similar hook ups. you may not be able to fit this panel as well as other jacks into the smaller Game Boys"