This Multi-Channel Volume Control can handle up to 20 independent channels, allowing you to build your own home theatre or surround system. You can use a touchscreen LCD panel, an IR remote control or an OLED Module with a rotary encoder to control it. This article has all the construction details. by Tim Blythman
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Build your own safe, low-voltage mini spot welder, which runs from a 24V DC supply. Despite this, it can deliver over 1000A. This CD Welder is perfect for making your own thermocouples or even battery packs! by Phil Prosser