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DIY Tiny 5V / 2A Boost Converter (simple)

Intelligent Li-ion Cell Management System (Li-ion cell charger with protection system)

DIY Li-ion Cell Charger Using TP4056 (intelligent and simple )

Transistor Boost Converter for LED Flash Light (from 1.5V)

5V Boost Converter

High Voltage Power-Supply Using Ignition Coil (DIY Plasma Glob/Bulb)

Ni-MH Battery Charger For 230v (Transformer less / SMPS)