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USB LED Lamp Circuit using 5 Volts - Electronic Circuits Diagrams-Electronics Projects Designs-Hobb
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日期：2025-12-11
A simple usb LED lamp circuit using 5 volts power supply from usb port, which can be used to light a desktop or laptop computer during power failure. ... Hi Kailash add one more 1N4007 in series with D2 then the constant current output at Q1 collector wil...看更多
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