Hi Braxton. the amp circuit came as a kit from milestones technologies in Colorado. It cost $6.95 + shipping I got 2 total cost 21.00 to Pa www.MorseX.com RK-AP1W Rainbow 1W amplifier kit look under electronic rainbow kits. Its a very simple build But I added the on/off switch to save unplugging the battery each time and u have to provide your own 1/4 stereo jack and of course the speaker of your choice. It will drive a large speaker in 8 ohm. I'm always on the hunt for cheap amp kits and will post what I find. Hope this helps ya and good luck
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