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Inverter for Soldering Iron

USB Power Injector For External Hard Drives

3-30V 3A Adjustable Regulated DC Power Supply

Building a 12v car charger for the ASUS Eee

Battery Powered Timing Device

Fixing Antec 400W ATX Power Supply

12V Batteries Car Charger

Switch for Over Voltage and Under Voltage

Adjustable Power Supply Using LM317

Simple 5V Power Supply for Digital Circuits