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Old 27th April 2003, 04:24 PM   #1
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Default Gainclone power supply options/questions

The building of the GC is nearing... I will be building the whole thing, case and all, unless I can find a suitable enclosure. I will also be building a pair of speakers and subwoofer to match. (horn loaded, of course... )

Anyway, I will be using OPA541's in my GC because I have them laying around and am on such a tight budget that I will not allow myself to splurge and buy two LM3875's for $10. So, I will be using Nichicon UPW caps (which are spec'ed almost exactly like Panasonic FC...), Solen metallized and Dayton non-metallized polypropylene caps, and Vishay/Dale 1/2W resistors. I will also be using a preamp stage, which will have my active xovers for the speakers/sub. There will be a buffer stage at input (opamp in unity gain) then a 12dB, 100Hz high pass for the mains, and a 12dB, 120Hz low pass for the sub, followed by a sub preamp with gain=6. Volume controls on mains and sub preouts. These will use Vishay/Dale 1/4W resistors and Dayton polypropylene caps.

Ok... so, now on to power supplies, which is where I was going... I have a 17-0-17VAC@4.7A transformer, which I will use. Do I simply hook up the power to recitifiers, then straight to the power chips with the 1000uF caps? Or do I buffer the PS in the PS section with high capactance (I might have some 27,000's coming) caps, then run this out to the chips which have their own 1000uF caps?

Thanks (note, if you see anything in my preamp, etc. areas that won't work, PLEASE tell me... I kind of know what I am doing, but could really use your help)
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Old 27th April 2003, 10:54 PM   #2
joensd is offline joensd  Germany
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Ok... so, now on to power supplies, which is where I was going... I have a 17-0-17VAC@4.7A transformer, which I will use. Do I simply hook up the power to recitifiers, then straight to the power chips with the 1000uF caps? Or do I buffer the PS in the PS section with high capactance (I might have some 27,000's coming) caps, then run this out to the chips which have their own 1000uF caps?
Thatīs one of the questions circling in my head as well.
Still havenīt found the time to through the whole TINJAG-thread where I might find some answers.

Iīd say the AC coming from the PS to the amp enclosures is worse to the signal circuitry than DC would be but thatīs just my guess.

Jens
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Old 28th April 2003, 12:05 AM   #3
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When using separate PS, place the rectifiers there and some small value caps (like 4.7u BG N) for filtering. 1000u caps are directly at the chip's pins. I didn't find using more capacitance to improve sound, it actually diminished my listening pleasure. If you not sure about that, leave some space in PS section and after getting used to the sound of just 1k uF try to add more capacitance and compare the difference. If you building multiple amps, the subwoofer amp will probably benefit from more caps.
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Old 28th April 2003, 02:52 AM   #4
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Ok... so no big caps. The seller of these caps is hard to contact anyway... I really don't want them anymore... grr

Does anyone have a comment on my active xover arrangement? I wonder if it will work... and how well it will work. The total cost of this project has exceeded that which I wanted to spend, so I may have to cut everything back further... if that is possible.

Question: If I use 3.5uF os capacitance on the input of the power amp section, technically, the preamp does not need any input coupling caps, right? Any DC amplified there will be caught by the power amp's coupling caps?
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