Is regulated PSU for phono preamp a MUST? - Page 3 - diyAudio
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Old 24th April 2005, 12:48 AM   #21
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Default AOS correction

My mistake! The 2 aos boards already meant 2 positive and 2 negative regulators pcds. In total including postage is confirmed and paid $33US. I thought I have to double that before.
Now the hard work is to do up a bom from the schematics!

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Old 24th April 2005, 03:06 AM   #22
Mikett is offline Mikett  Canada
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download the assembly manual from ALW the first link. It has a BOM I believe.
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Old 24th April 2005, 05:39 AM   #23
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Quote:
Originally posted by Mikett
download the assembly manual from ALW the first link. It has a BOM I believe.
Mike,

Problems,
1/ the ALW' site schematic is not the same as the AOS ones. That bom can not be used with the aos boards.
2/ ESP project P06 the schematic show different pin layouts between OPA637 and NE5532 I don't think OPA637 can be just a drop in with the P06 pcbs.

Back to the drawing board...

The Butcher
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Old 24th April 2005, 06:36 PM   #24
Mikett is offline Mikett  Canada
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Yes, you're quite right the ALW has an extra transistor in there for alittle tweak. The BOM is still largely the same though. His chart of substitutions will come in handy.

As for the 627/637 I thought initially that they were available as duals but it looks like not. But considering that you were concerned about the cost, those Ics are going to run easily over $100 by themselves. In that price target you'd better be sure you want them. Otherwise just stick with more reasonably priced ICs and keep trying till either you find one you like or they become available as a dual package. You could always try creating a dual package from two singles as an experiment. But again at $50+ a pop I'd be sure that they'd work and sound they way I want first.

I think techdiy has some good prices on ics & trans for the super regs.
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Old 24th April 2005, 10:00 PM   #25
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Well Mike... thats ok .. I thought as you suggested if I could use the ESP P06 pcb then it would be nice. I already have 4 opa637 and all the parts at hand and ready to solder..but.....so now I am just stick to my original notion and copy this http://www.diyaudio.com/forums/showt...426#post300426
using P2P


The reason I bought 4 opa637 is just in case I blow up a couple of them while testing.

I wrote up the BOM for the aos S.reg boards from the schematics, just need to make sure what I already have at hand before ordering the rest of the parts. Hopefully the S.reg boards will be here sometime next week. Cost management.. ah yes.. when I got the quote I misundertsood that just the S.reg pcbs cost $66US and to me that is a bit much..but now I paid only $33US for them and it is bearable.

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Old 19th May 2005, 04:06 PM   #26
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Got the 4 pcb from aos. Just order the rest of the parts last night. I am having trouble with the super reg regulator pcbs. I ordered the AD825 but I have no idea which opa321p to order from DigiKey

There is no support from aos so I am also having trouble as to how to hook up the silly thing and it is getting expensive.
So far I have spend $33US for the pcbs. The parts for the reg is around $80cdn without the 4@opa321.

The rest of the PSU has not been design yet...will post some pics tonight

P2P done for the phono preamp except the loading cap and resistor because I am yet to know what cable to use from the TT to the phonostage.

AndrewT,
The 250pf is the total capacitance including the cables from the Pearl spec sheet.
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Old 20th May 2005, 05:32 AM   #27
Mikett is offline Mikett  Canada
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if you got the ad825, then you don't need the opa132p. You just need one op amp per rail.
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Old 20th May 2005, 11:25 AM   #28
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chris ma,
if you encounter problems how to stuff the regulator boards i could help you out with the circuit for that specific boards.

and the AD825: is there any dip8 replacement that provides similar performance?

Rüdiger
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Old 20th May 2005, 12:00 PM   #29
Jennice is offline Jennice  Denmark
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Excuse me for interrupting the chat here, folks... but I understand that the butcher isn't giving much attention to the enclosure (if any at all)...

There WILL be a shielding ( == conductive) enclosure, right? Otherwise there will be a lot of RF noise to worry about, rather then the quality of the supply regulation.

Just my 2 cents
Jennice
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Old 20th May 2005, 12:14 PM   #30
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Jennice,

Thanks for the advise. I am yet to decide on a remote supply or same enclosesure with the phono stage, but I hear you. You are getting to know the Butcher's style
In either case I will take your adivce to have a shield for them. I bought some self adhesive copper sheet, great stuff so I can just line the inner surface and the bottom plate to what ever material end up as the case. There is a nice aftershave hard cardboard box from Dunhill that I can use..
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