flyback LED power supply

T1 100
H 1.5V D C

+

D1 W H ITE LE D

R1 220

EI G HT TU R N S AW G # 3 0 Q2 Q1

2N3 9 0 4

2N3 9 0 4

Figure 1 Two transistors and an easily assembled transformer drive a white LED from a single 1.5V battery.

edn070215di373 41

DIAN E