USB Reading Lamp

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.

 

USB lamp
Parts
  1. c1,c2 – 100 mF 25 v
  2. Zener diode – 4.7v 400m
  3. R1- 220 r
  4. R2- 100 r
  5. T1 – SL100
  6. White LED – 5 nos.
  7. USB Cable

Leave a Reply