Need Help with + _ 90-100 volt regulated power supplies - diyAudio
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Old 15th March 2008, 02:22 AM   #1
wrich22 is offline wrich22  United States
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Location: Louisville, Ky
Cool Need Help with + _ 90-100 volt regulated power supplies

I am currently rebuilding two Hafler DH-500 amps, using toroidal transformers, Fred rectifiers and Musical Concepts PA-3E boards
with black gate caps, and 4 - 39,000 uf main caps per amp. To be used to bi-amp my SDA-SRS speakers which I just purchased on e-bay and have since reworked with new mils resistors and Polyproplyene caps

I am looking for a state of the art power supply -+ 95 volt for the
front end, low level and drivers. I plan to leave the Mosfets unregulated.

I have built several power supplies, based on Boak, Sultzer and Jung designs . Using NE-5534 and LM317-LM337's and floating zener designs, for other Hafler, Dynaco 416, Leach Super Amps, and the Marsh pre-amp about 20-25 years ago. But haven't done much since then

What is the power supply design that will give me the best
results, for my new system. Also I need advice regarding removing
the resistor that separates the Mosfet drivers from the front end

My Initial aproach is use the LM317 and LM337 and float them
using a Zener String using seperate 5-10 volt transformers coupled to the main transformer to give a voltage boost ,rectify and regulate all with a common ground

I would appreciate any advice that anyone has.


Bill (wrich22)

Louisville, Ky
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Old 20th March 2008, 08:53 PM   #2
Gordy is offline Gordy  United Kingdom
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For a high voltage regulator have a look at

Fig. 11 in Linear Technologies Application Note 2, August 1984, Performance Enhancement Techniques for Three Terminal Regulators.


National Semiconductor Linear Brief LB-47, March 1980, High Voltage Adjustable Power Supplies.

For more advice on the amp consider a posting in the Solid State section of the forum.

Good luck,
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Old 20th March 2008, 09:22 PM   #3
KSTR is offline KSTR  Germany
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This one might be helpful:

Basically identical to what a LM317 does... and with a little redesign one could get away with no extra supply for the regulator.

- Klaus
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Old 21st March 2008, 09:37 PM   #4
wrich22 is offline wrich22  United States
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Location: Louisville, Ky

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Old 21st March 2008, 10:46 PM   #5
Cobra2 is offline Cobra2  Norway
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How about the psu-part for Balanced Line Stage / BoSoZ? (with a couple zeners extra)

Arne K
Don't believe everything you think...
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