Arduino Constant Current Power Supp;y | Henry's Bench
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Tool-O-Dex Plans: Build the Ultimate DIY Tool Rack
Use this genius pegboard system to store tools.
Get your life in line.
How to Make a 12v Battery Charger
The best instructable Ive seen for a DIY CNC. Also has plans for conversion to 3d printing. Huge steel. Much cool. Very wow.
Bend copper tubing without crushing it by first filling it with salt or sand. - rugged life
This is a simple battery charge level indicator circuit and is very useful to calibrate inverter status, to measure car battery level, etc.
Digital Volt Ampere Meter