White LED on 1.5 v Supply

2 White LED on 1.5 v Supply

Parts

T1 - BC338

R1 - 2.7 K

C1 - 10 n

D1,D2 - Super bright LED

Transformer - 60 T, 40 T

S1 - On/off Switch

Battery 1.5 V

White LED Flasher

Parts

T1 - BC338

T2 - 2N2222

R1 - 2.7 K

R2 - 47 R

R3 - 330 R - 1K

C1 - 10 n

C2 - 100 

D2 - 1N4148

Battery 1.5 v

USB Reading Lamp

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.

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