Most of the components are available from Farnell in the UK. The mosfets are available from
Farnell, but are more expensive than some other sources. There is always a small risk of
getting fakes if buying at the lowest possible price. I got my mosfets from Nikko. These appear to
be full spec genuine devices, so I will continue to use them myself, for the mosfets only.
The list is for a single channel, so two of everything is needed apart from C11 and fuse F1.
Ic1, R9 and D6 are optional, they can all be replaced by R18 with very little change in performance.
T1 2SC2547E - NPN low noise TO-92 or 2SC2240BL
T2 BC560C - PNP low noise TO-92 or 2SA1085E (note different pin sequence)
T3 2SC2911 - NPN 160V 140mA TO-126
T4 2SA1209 - PNP 160V 140mA TO-126
T5 2SA1209 - PNP 160V 140mA TO-126
T6 2SK1058 - N-channel lateral mosfet 160V 7A TO-3P
T7 2SJ162 - P-channel lateral mosfet 160V 7A TO-3P
IC1 LM234 current source. (optional)
D1, D2, D5, D7 - 3mm Red LED HLMP-1301
D8, D9, D10, D11 - 12V 500mW Zener diodes
D3, D4, D6, - BAV20 200V 200mA diodes
L1 0.4uH. 13 turns 18swg enamelled copper wire, inside diameter 1cm length 1.6cm.
Wire diameter 1.2mm, total length of wire about 50cm.
F1 2A-T fuse, 20mm x 5mm. (one only for 2 channels)
Vr1 220R Preset potentiometer
Vr2 4k7 Preset potentiometer
All resistors are metal film 1% 500mW or 600mW apart from those listed as '1W or 2W'.
The colour codes are listed later on this page.
R15 1R5 1W or 2W
R16 1R 1W or 2W
C1 2u2 polyester 7.5mm lead pitch e.g. Epcos B32560J1225K
C2 470p polypropylene 5mm pitch (I used WIMA 1000V)
C3 470p polypropylene 5mm pitch
C4 470u 63V electrolytic 5mm lead pitch
C5 1n polypropylene 5mm pitch
C6 10p COG/NPO 200V ceramic (The ones I used are marked 100J)
C7 1n polypropylene 5mm pitch
C8 100u 16V electrolytic radial 5mm dia.
C9 100p polypropylene 5mm pitch
C10 100n polyester 5mm pitch
C11 470u 63V (for 60V supply) 5mm pitch (one only for 2 channels)
C12 4700u 63V electrolytic, Panasonic TSUP. 10mm lead pitch, 25mm diameter, 2mm dia mounting holes
C13 10u non-polar electrolytic
C14 100n polyester 5mm pitch
C4, C11 and C12 need to have voltage rating greater than the supply voltage.
63V rating is suitable only for up to a 60V supply.
The transistors are rated 160V so in theory this is the upper limit, but I don't recommend this.
I only tested up to 94V. At anything much more than 60V some or all of the TO-126 transistors
may need heatsinks.
Printed circuit board
Insulating mica washers for TO-3P case mosfets
Terminal blocks, nuts, bolts, spacers, wire,
Heatsink, heat conducting paste, case, +60V power supply, on/off switch etc.
RESISTOR COLOUR CODES - 1% tolerance.
1R brown black black silver brown
1R5 brown green black silver brown
12R brown red black gold brown
68R blue grey black gold brown
300R orange black black black brown
470R yellow violet black black brown
1k brown black black brown brown
5k6 green blue black brown brown
10k brown black black red brown
56k green blue black red brown
200k red black black orange brown
560k green blue black orange brown