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DIY hand-powered water pump generator | Build a mini pump & light LEDs with recycled materials!

Discover how to build a hand-powered water pump that also generates electricity to light up LEDs using everyday recycled ...
Hackaday

555-Based Square-Wave And Triangle-Wave Function Generator Build For Beginners

Over on YouTube [Andrew Neal] has a Function Generator Build for Beginners. As beginner videos go this one is fairly comprehensive. [Andrew] shows us how to build a square-wave generator on a ...