USB Reading Lamp

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USB reading lamp is powered using USB port. The USB port provide 5 v and 100mA which is sufficient for this circuit. Cut the one end of the USB cable and use RED(pin1) and Black(pin4) for 5v positive and negative respectively.   Parts c1,c2 – 100 mF 25 v Zener diode – 4.7v 400m R1- […]