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Old 19th May 2009, 09:19 PM   #701
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I think 35VAC/50VDC is way too much.

LM3875 can handle (in theory) 84VDC(42-0-42).
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Old 19th May 2009, 09:27 PM   #702
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Quote:
Originally posted by roger_lew
and I figure my rail voltages will be about 50V (35 x 1.4).
Those would be way too high, you shouldn't be exceeding 40V on rails.
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Old 19th May 2009, 09:38 PM   #703
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Thanks, that makes sense. I was thinking the 84 rating was from 0 to the rail.

Does anyone know if a regulated center tap power supply suitable for gainclone use?
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Old 19th May 2009, 10:00 PM   #704
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Check this thread for regulated supply option: LM338 regulated snubberized PSU for audio amplifiers

However, don't take seriously the hype that it elevates the chipamp to a league of it's own.
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Old 20th May 2009, 12:58 AM   #705
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Thanks again Peter. That thread was helpful (despite the hype ).

I suppose the easiest way to go about this is to give up on dual mono and have a single PSU power both channels. That way I can use each transformer to power each rail of a regulated power supply (with center tap wave rectifier).

Building a dedicated regulated supply for each channel isn't straight forward enough for me to attempt given my very limited experience. Since I have center tapped transformers building one seems to require a 5 amp negative voltage regulator (complementary ICs to the LM338) which don't seem to be commonly available.

Does this plan seem reasonable?

Roger
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Old 20th May 2009, 01:23 AM   #706
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Quote:
Originally posted by roger_lew
... one seems to require a 5 amp negative voltage regulator (complementary ICs to the LM338) which don't seem to be commonly available.
You don't need that, both positive and negative rails are powered from a (positive) LM388 regulator: http://www.diyaudio.com/forums/attac...amp=1114473823
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Old 20th May 2009, 01:39 AM   #707
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Right, we are on the same page. If I build a single power supply for both channels I don' t need a negative voltage regulator. I can use two LM338s.

But if I wanted to go full mono and build a regulated dual channel supply with a single center tapped transformer I would need a high current negative voltage regulator.
http://www.diyaudio.com/forums/showt...94#post1616994
http://www.diyaudio.com/forums/showt...73#post1617073
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Old 20th May 2009, 11:19 AM   #708
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If you use half of each transformer, you can build a positive regulator on each.
Couple the two +ve supplies together to create a dual polarity supply.

What a waste of resources.

If these transformers are so important to you then buy amplifiers that suit +-50Vdc supplies.
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Old 20th May 2009, 04:38 PM   #709
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You can use one (complete) transformer per rail, if you wire them as in attached schematic. This setup will also allow positive regulator in a negative rail.

Such supply would be powering both channels.

If you need dual mono configuration, with separate supply for each channel, you need to source suitable negative regulators.
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Old 20th May 2009, 07:07 PM   #710
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Andrew,

Thanks for the advice. I'm dead set on building a gainclone from a audiosector kit due to their simplicity and the detail Peter has put into the instructions. Whether I use these transformers with a regulated PS or buy toroids is still something I'm tolling over. I might just save these for a more suitable project down the road.

Peter,

I placed an order for a premium kit. Thanks for the schematic. We are still on the same page.
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