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- 220 r
- R2- 100 r
- T1 – SL100
- White LED – 5 nos.
- USB Cable
