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Old 1st November 2010, 06:24 PM   #561
qusp is offline qusp  Australia
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you have nothing to worry about. the LM317/337 are floating regulators and have npo ground pin, as long as you do not short them to ground, they have no idea what voltage they are being fed, all that matters to them is the input/output voltage differential; which is WELL within spec. you could feed them 600v as long as you wanted 560v or more output
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Old 1st November 2010, 06:33 PM   #562
Salomon is offline Salomon  Germany
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Quote:
Originally Posted by flocchini View Post
I believe that Parts Connexion has 390 ohm Caddocks
Normaly Caddock has not the 390R value.
See here the Datasheet:
http://www.caddock.com/Online_catalo...000_Series.pdf
I hope you get really the right resistors.

390R is ok. You get 2,6% less audio output level.
I would say, the non-inductive-design is important for the circuit performance.
then you can take a low or non inductive Ohmite, Caddock or Bournes.
I also think the quality of the C28, C29, C51, C52 is very important.
The best capacitor is no capacitor. I would take a good capacitor and bridge them with a little silver mica (Glimmer).

regards
Horst
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Old 1st November 2010, 06:36 PM   #563
Salomon is offline Salomon  Germany
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Quote:
Originally Posted by qusp View Post
you have nothing to worry about. the LM317/337 are floating regulators and have npo ground pin, as long as you do not short them to ground, they have no idea what voltage they are being fed, all that matters to them is the input/output voltage differential; which is WELL within spec. you could feed them 600v as long as you wanted 560v or more output
Yes, this is right. Thank you.
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Old 1st November 2010, 06:45 PM   #564
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CADDOCK: MP925 & MP930 SERIES RESISTORS
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Old 1st November 2010, 07:03 PM   #565
qusp is offline qusp  Australia
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Quote:
Originally Posted by Salomon View Post
I also think the quality of the C28, C29, C51, C52 is very important.
The best capacitor is no capacitor. I would take a good capacitor and bridge them with a little silver mica (Glimmer).

regards
Horst
there is indeed 390R caddocks, yes, by geeves you may be onto something, the output caps are important??... hehe just joking, but yeah they are indeed. I eventually will be using some jantzen superior bypassed with VCAP CuTF (already have 2 spare, need to pick up another pair) first up i'll just use some cheaper AVX polypropelenes I have on hand. all of this until I get around to playing with a JFET servo. owen any ideas on a servo? did you consider it for this build and if so what turned you off, lack of simplicity?
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Old 1st November 2010, 07:07 PM   #566
qusp is offline qusp  Australia
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Quote:
Originally Posted by Salomon View Post
Yes, this is right. Thank you.
no problem, easy mistake.
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Old 1st November 2010, 09:33 PM   #567
NicMac is offline NicMac  Italy
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opc,
Are all the SMD components of the BOM present in the SMD bundle?
Thanks for the great work!
Nic
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Old 1st November 2010, 10:07 PM   #568
qusp is offline qusp  Australia
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yes they are
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Old 1st November 2010, 11:23 PM   #569
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Hi Gents,

if there are spare boards I'd be interested in one . If there is a bundle ,even better .

Rich
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Old 2nd November 2010, 11:50 AM   #570
qusp is offline qusp  Australia
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BTW guys, got 100 fets on the way so will probably have a few nicely matched sets left, though I do want to keep a fair few personally.
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