This is an incredible build by YouTuber BrendaEM. Even if you don’t watch the entire explanation of the electronics and circuits encased inside the cabinet, the first few minutes are a joy to hear BrendaEM describe the amount of parts upcyclced to assemble this thing. From an oscilloscope knob to reclaimed whiteboard and plywood from a nearby community center, to the speakers themselves (otherwise left on a friend’s porch for two years!). This shows what is possible with all those spare parts you have laying around – set yourself a goal and get makin’! And if you do stick around to watch the entire video which includes an explanation of the back panel electronics you will likely pick up a few pointers and tips should you want to build something similar yourself!

This is a look at my homemade 50 Watt (25-Watt by 2-channel) guitar amplifier. It is LiFePO5 battery-powered. It runs for hours at levels loud enough to overcome traffic noise, and then some.

Many of the amplifier case parts were reused materials. The amp has given 2 years of harsh service.

Warning: you should only attempt building such an amplifier if you have good electrical/electronics practices, are quite familiar with lithium-based (LiFePO2) rechargeable battery safety, and have used the right battery for the right application, use a battery manager, have installed fuse(es), and provide for proper cooling. If you build such and amplifier, you do so at your own risk.