Auto-Switching Practice Guitar Amp

Just completed: an auto-switching practice guitar amp.

It turns on when you plug in a guitar, and the speaker turns off when you plug in headphones – no confusing switches needed!


  • 1 Minty Amp kit
  • 1 mono 1/4″ plug with NC and NO switches (guitar in)
  • 1 stereo 1/4″ plug with two NC switches (headphones out)
  • 1 random speaker found laying around the space
  • 1 9v battery adapter
  • 1 Altoids tin
  • a liberal scattering of solder, wires, and hot glue

Total cost: about $10


Built by Sacha, photos by Ryan L

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