This Low power regulated dc to dc converter circuit obtained by adding a flyback circuit to a square wave oscilator.
This dc dc converter circuit operating at a frequency of 20 kHz to minimize the size of L1 and C2. Regulation is achieved by zener diode D2. Maximum current available before the converter drops out of regulation is 5.5 mA.
Parts list :
R1, R2 : 300K
R3 : 560K
R4 : 100K
R5 : 10K
Rset : 100K
L1 : 2mH
C1 : 470pF
C2 : 10uF
D1 : 1N914
Q1 : 2N4403
IC : L161
