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Transistors circuits explanation3v to 5v boost circuit for battery charging and led driver applications .
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Simple Voltage Booster Circuit Using Transistors - DIY
DIY 3.7V to 5V Boost Converter for Lithium-Ion Battery
3V to 5V Boost Circuit for Battery Charging and LED Driver Applications
voltage - Step up 3.3V to 5V - Electrical Engineering Stack Exchange