Parts-
R1, R2, R3, R4,R8, R7 6 100K 1/4W Resistor
R5 1 470 Ohm 1/2W Resistor
R6 1 10K Linear Pot
C1 1 0.01uF Mylar Capacitor
C2 1 0.1uF Ceramic Disc Capacitor
C3 1 470uF 63V Electrolytic Capacitor
D1 1 1N4004 Rectifier Diode
D2 1 BY229-400 Fast Recovery Diode
Q1 1 BC337 NPN Power Transistor
U1 1 LM358 Dual Op Amp IC
L1 1 See Notes
MISC - Board, Wire, Socket For U1, Case, Knob For R6, Heatsink for Q1
Notes-
1) R6 sets the output voltage. This can be calculated by Vout = 12 x (R8/(R8+R7)) x (R6B/R6A).
2) L1 is made by winding 60 turns of 0.63MM magnet wire on a toroidial core measuring 15MM (OD) by 8MM (ID) by 6MM (H).
3) D2 can be any fast recovery diode rated at greater then 100V at 5A. It is very important that the diode be fast recovery and not a standard rectifier.
4) Q1 will need a heatsink.
