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DHR TURBO
2008 Carlos Mergulhão
©
REV. JULY 5, 2008
SCHEMATIC BY TODD A. JOHNSON
Driver transistors mount on main
heatsink with the output transistors
100nF
100V
1000µF
100V
5A
220nF
270R
10µF
16V
x2
470pF
220nF
100V
100V
10R
.5W
2200µF
100V
100nF
2200µF
33K
100V
BC556
BC546
100nF
4.7nF
82R
100R
220µF
100V
4K7
4K7
3K6
47nF
100V
100R
820R
16V/1W
BC556
BC546
100R
(@75R)
offset
adjust
100nF
100nF
33K
10pF
3K3
.5W
3K3
.5W
220µF
100V
2.2µF
16V
or
Film
4R7
220nF
39pF
This transistor needs
Individual heatsink
68R
Diode string must be thermally
coupled to main heatsink
33R
1N4002
x4
2SC4793
33R
200R
(@100R)
bias
adjust
270R
68R
1µF
2SC4793
2SA1837
100R
2R2
2R2
2R2
5W
2R2
5W
1R
2R2
2R2
2R2
2R2
1R
5W
1R
5W
1R
1R
5W
1R
5W
2R2
2R2
2R2
5W
5W
1R
1R
5W
5W
1R
1R
5W
1R
5W
1R
+70VDC
1µH
330R
10A
OUT
Notes & Tweaks:
Output transistors are 2SA1943/2SC5200 or equivalent
Driver transistors would be better if they were same device as output transistors.
Diode string would be better if they were same device as output transistors. (Wired Base to Emitter.)
Output Coil is 20 turns of 1mm (AWG 18) wire.
Small signal transistors can be either BC556/546 or 2N5401/5551
Output rail capacitors can be 470µF to 2200µF. Bigger is probably better.
Adjust bias to 35-40mA, then tweak until voltage across 1R output emitter resistors are 1mV or slightly less.
2R2
100nF
100V
1000µF
100V
-70VDC
5A
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