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Old 12th November 2008, 03:16 PM   #31
pirej is offline pirej  Macedonia
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Need help:

I have transformer 32-0-32 ..5 Amperes... and wanted to use to "drive" my Gainclone, made by LM3886 (stereo version).

- If I use 40v capacitors can I get "normal" power supply for GC?(for example 36-37v per rail).

-Is there a schematics for regulated supply in which my transformer will fit? (Lt1083 or somethnig else..) to lower the supply on 35V per rail..

- No way - just to make single supply version (to use as 64V or twice by 32V?)

- Or...
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Old 12th November 2008, 08:04 PM   #32
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Your transformer puts out 32V AC. Multiply by 1.4 and you get 44.8V DC. The maximum for the LM3886 is 42V. Also, using a 40V capacitor with 44.8V rails will cause destruction of the capacitor. The capacitor is not a limiter, it must be rated for higher than the highest voltage it will see.

A regulated supply is your best bet if you want to use that transformer. Unfortunately I can't help with that.
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Old 12th November 2008, 08:18 PM   #33
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Quote:
Originally posted by pirej
-Is there a schematics for regulated supply in which my transformer will fit? (Lt1083 or somethnig else..) to lower the supply on 35V per rail..
Check this thread: LM338 regulated snubberized PSU for audio amplifiers
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Old 13th November 2008, 07:30 AM   #34
pirej is offline pirej  Macedonia
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Thnx for the response,
Last question -
The trafo that I have, has only three wires as secondary 32-0-32, which means - NO independent secondaries.

can I use Carlos regulated PSU as shown in attachment?
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File Type: jpg psu copy.jpg (41.4 KB, 3390 views)
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Old 13th November 2008, 08:42 AM   #35
AndrewT is offline AndrewT  Scotland
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Old 13th November 2008, 11:51 AM   #36
pirej is offline pirej  Macedonia
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The last try by me to use the trafo

Is this OK?
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File Type: jpg psu-last.jpg (84.7 KB, 3224 views)
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Old 13th November 2008, 12:07 PM   #37
pirej is offline pirej  Macedonia
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The last try by me to use the trafo

Is this OK?
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File Type: jpg psu-last.jpg (84.7 KB, 3074 views)
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Old 13th November 2008, 12:37 PM   #38
AndrewT is offline AndrewT  Scotland
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Hi,
are you trying to get+-24Vdc from your regulators?
Then use a 24Vac or 25Vac transformer.
You need a single bridge rectifier if you use a centre tapped transformer.
You can use either a dual or a single bridge rectifier if you use a dual secondary transformer.
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Old 13th November 2008, 02:33 PM   #39
pirej is offline pirej  Macedonia
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I'm trying to get 35v regulated as max. for stereo LM 3886.

The above schematic is OK with my trafo 32-0-32v?
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Old 13th November 2008, 02:51 PM   #40
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I would love to build a chip amp based amplifier for my automobile... Any chance of some advise on designing a Power supply for Automobile enviroment ?
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