Step 1: Parts & Tools
a Atari punk console kit (APC) you can buy one here Maker Shed
a NPN transistor
a small iPod/iPhone dock (See notes)
a DPDT (Double Poll Double Throw) switch this is your bypass switch
2 1/4" Panel-Mount TRS mono jacks for the guitar in and effect out to speaker amp
Flush diagonal cutters
Needle nose pliers
A small flat head screwdriver
A hold making device. (If your enclosure is plastic you can use your soldering iron but this may damage the tip)
I like to use iPod/iPhone docks because they usually have a AUX in jack that you can desolder easily and their small. Its best if it runs on 9V. It could be 1 9V battery or 6 1.5V batteries (6 AAA's, 6 AA's, or 6 C's). Anything that is a power amplifier will work.
Step 2: Build APC
Step 3: The Effects Modulator Part
Step 4: The Effects Input Part
Desolder the AUX input, speakers, & power of your iPod/iPhone dock.
Solder some wires to where the AUX input used to be. If it was a stereo jack then solder the Left and Right channels to the tip of one of your 1/4" Panel-Mount TRS mono jacks and the ground to the sleeve. The speakers + out needs to be soldered to the NPN transistor's N or Collector and to one of the middle leads of your DPDT switch. The speakers - out needs to be soldered to the sleeve of the other 1/4" Panel-Mount TRS mono jack. Allmost Done! Now solder the NPN transistor's N or Emitter to t 1/4" Panel-Mount TRS mono jack's tip. Also solder a wire from here (the NPN transistor's N or Emitter) to the same pole but one of the leads of the switch above or below it. NOT NEXT TO OR DIAGONAL FROM IT! This will act as your bypass switch.
Step 5: Power
Step 6: !!ROCK OUT TIME!!
YouTube video and more photos will be up soon of mine.