This, my first Instructable, will show you how to add an external speaker jack to the infamous Pignose 7-100 battery powered amplifier. With this mod, you can use your Pignose to drive any size speaker, even a Marshall stack! If you love the sound of your little Piggy now, just wait until you hear it with large speakers.
I assume a basic understanding and ability to solder and drill sheet metal, but beyond that, this is pretty simple.
Step 1: Parts identification
You will need to purchase a mono switched phone jack, refer to the attached photo. This jack has three terminals, one for ground, one for the signal input, and one for the signal output. With nothing plugged in, the signal in and out terminals are connected together and the audio is sent to the Piggy's internal speaker. With a plug connected, the signal is routed to the external speaker instead of the internal Pignose speaker. This part is available from Mouser Electronics, p/n 161-MJ160M-EX