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Old 8th June 2004, 02:25 AM   #1
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Default Highest DC Voltage Rails anyone has used on a 3886

I have a transformer that puts out +/- 48 VDC. Should I risk trying it on a parallel gainclone that will have 3 ch. in parallel?

-Paul Hilgeman
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Old 8th June 2004, 02:39 AM   #2
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Default that's way too high

+/-40vdc with signal is the datasheet maximum...you are courting trouble if you use these rails...
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Old 8th June 2004, 08:24 AM   #3
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Default high voltage

To PHilgeman

How big is your transformer (VA) ??

Thomas
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Old 8th June 2004, 09:06 AM   #4
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Ive run my 8 cahnnel bridged gainclone amp on +/- 42V for a few years now. No problems.
You have to be careful with heatsinking as they get REAL hot.

48V might pushing the limit a little too much.
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Old 8th June 2004, 09:55 AM   #5
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Maybe you could regulate the voltage down a little. Maybe it's a bit complex for a chip amp tho, I wouldn't really know...
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Old 8th June 2004, 01:17 PM   #6
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Any way to drop the voltage at all?

-Paul Hilgeman
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Old 8th June 2004, 01:39 PM   #7
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Paul, does your transformer have a center tap?

Jan Didden
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Old 8th June 2004, 01:53 PM   #8
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Time to regulate.
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Old 8th June 2004, 05:28 PM   #9
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Default Re: Highest DC Voltage Rails anyone has used on a 3886

Quote:
Originally posted by PHilgeman
I have a transformer that puts out +/- 48 VDC. Should I risk trying it on a parallel gainclone that will have 3 ch. in parallel?
You can do two things:

1) If your transformer is toroidal and you have two secondaries, you can take wire out from both.

2) Regulate to +/-40V, but be careful to heatsink the transistor or regulator quite well, as you should have plenty of heat. The 8v difference should give you plenty of room to regulate in spite of AC line drops.


Carlos
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Old 8th June 2004, 07:03 PM   #10
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Any links to ways to regulate things?

It is a standard transformer, so I cant unwind. It has a ton of VA, guessing from the transformers I have seen, about 800VA or so.

BTW, I did run an 3886 for a while on the 52V supplies. It worked find and delivered very tight, deep bass, but then it just locked to the - rail.

-Paul Hilgeman
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