R1-1K
R2-220
R3-68
R4-18 2W
R5-18 2W
R6-68
R7-220
R8-1K
R9-12K
R10-10K
R11-18K
R12-4.7K
R13-4.7K
R14-* see below
R15-2.2 2W
R16* see below
R17-100 2W
C1-0.047 250V
C2-0.047 250V
C3-0.1uF
C4-1000uF 25v
C5-1000Uf 25v
C6- 47uF 400V
C7-0.1uF 400V
C8-4u7 35v
C9-0.01uF
C10-1000pF non ceramic
C11-1uF
Q1-2SA1115
Q2-2SA1115
Q3-MTP75N06, for 100W or 125W, use SUP75N06
Q4-MTP75N06 for 100W or 125W, use SUP75N06
D1-1N4148
D2-1N4002
D3-12V 1/2W Zener Diode
D4-1N4148
D5~D8 UF4007
D9-GP-15J
IC-TL494
Remember to install the jumper J1 before install the switching transformer!
For R16 and R14, the feedback resistor can be set to reference of 5V, ( practically 4.95V) and current is around 1mA. For 240V-280V, R14 can be 270K ohm 2W, for 280-300V will be 330Kohm 2W, and 390Kohm 2W for 360Vabove.
For example, AH-125W 350V output will be R14= 390K 2W, R16= 5.6K 0.25W
390K + 5.6K = 395.6K
350V/395.6K= 0.8847mA
Voltage across R14= 5.6k X 0.8847 = 4.95V ( same as reference voltage)
to increase the output voltage slightly, parallel a 100K or 82K with 5.6K and you will get 360V~375V.
SCHEMATIC PLEASE CLICK HERE
*I would like to thank Mr. Dexter Patrick who spend his time to re-draw the schematic for me. :) *