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Old 30th March 2011, 01:16 PM   #1
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Default Any gainclone using 60 Volts?

Hello to you all.
I have been looking to build an amp to replace the output of an old receiver and have looked at designs using 3886 etc put they all are in the +- 35volts range. Are there any similar chips using +- 60 volts. I am aware of the old STK0080 series but never found good reviews of them. Would prefer something more modern and of better sound quality but still simple like the gainclones.
Thanks.
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Old 30th March 2011, 02:12 PM   #2
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Apex precision power from cirrus logic has power opamps all the way up to -+200v.
However the are very pricey. jer
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Old 30th March 2011, 02:58 PM   #3
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60 volt rails is an amp of a very high output power, why that voltage?

Last edited by Rainwulf; 30th March 2011 at 03:00 PM.
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Old 30th March 2011, 03:29 PM   #4
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Quote:
Originally Posted by Rainwulf View Post
60 volt rails is an amp of a very high output power, why that voltage?
Because that's the transformer in the receiver he wants to modify.
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Old 30th March 2011, 11:32 PM   #5
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Oh of course, my bad, i didnt read the question properly.
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Old 30th March 2011, 11:38 PM   #6
tomchr is offline tomchr  United States
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I rebuilt a Parasound A23 using an LME49811 driver and an STD03N/STD03P output stage. The A23 main board was fried, but the +/-56~60 V supply was still good. So I reused the supply and built my own amp board.

See thread here: Yet Another LME49811 + STD03 Build

Not quite as simple as the LM3886, but better performance and not that much more complexity.

~Tom
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Old 31st March 2011, 12:26 AM   #7
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Thanks for your response as was stated the amp has a +- 60 volts supply and also the space is limited . So I need something compact and price is also an issue.
Thanks. I will check out the LM4702 designs.
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Old 31st March 2011, 01:20 AM   #8
tomchr is offline tomchr  United States
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I forget the exact size of my LME49811 board. 6x10 cm or so. Fairly compact. Not as compact as an LM3886, but close enough. I've seen people (panson_hk in particular) build modules that would fit on the back of a heat sink. That may be an option for you.

~Tom
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Old 31st March 2011, 02:23 PM   #9
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You could use almost any chip amp in a single supply with one 60V rail. For example, the absolute max for the LM3886 is 84V, regardless of whether it's dual supply or single supply.
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Old 31st March 2011, 10:11 PM   #10
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A bridged LM3886 would be good with a 60volt supply.
Or better yet a BPA-200 using four LM3886's or two LM4780's.
You could use one amplifier circuit per rail. jer

P.S. A BPA-100 would probably be a better choice depending on the VA rating of your transformer.

Last edited by geraldfryjr; 31st March 2011 at 10:32 PM.
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