John Curl's Blowtorch preamplifier part II - Page 2357 - diyAudio
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Old 31st May 2012, 12:11 AM   #23561
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Quote:
Originally Posted by vacuphile View Post
Make separate grounding points at the diode bridge and after the 317/337.
Can you show a picture please? I don't understand what you mean. How separate is diode ground from ground of filter capacitors? What connect them together? And what means "after" if the IC has a single ground leg?
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Old 31st May 2012, 12:35 AM   #23562
Bonsai is offline Bonsai  Taiwan
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[QUOTE=john curl;3042896]My contribution: I hope that it answers a few questions. It is not the complete CTC Blowtorch power supply, but it is close enough for discussion.

I would keep the +and - supplies completely separate and then only combine them after regulation. Then your audio ground cannot get mixed up with the PSU ground.

I mentioned in an earlier post a few other tricks to keep the supply rails conducting only DC (or as near as dammit to DC). On the amplifier ground side, split it into decoupling ground and signal ground. You will have AC in the ground, but at least it's split into two parts then: signal AC and decoupling AC.

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Old 31st May 2012, 12:37 AM   #23563
Bonsai is offline Bonsai  Taiwan
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And as already mentioned, screen between pri and sec along with diode snunbbers also makes a big difference. I have no qualms slapping a good quality Schaffner mains filer on the AC side either. Works wonders.
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Old 31st May 2012, 01:23 AM   #23564
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Quote:
Originally Posted by Bonsai View Post

I would keep the +and - supplies completely separate and then only combine them after regulation. Then your audio ground cannot get mixed up with the PSU ground.
Good advise.
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Old 31st May 2012, 01:26 AM   #23565
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Quote:
Originally Posted by Bonsai View Post
I have no qualms slapping a good quality Schaffner mains filer on the AC side either. Works wonders.
Do you mean Schaffner makes filters usable as input filters for sensitive analog devices? What's the part number?
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Old 31st May 2012, 02:03 AM   #23566
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Schaffner Mains Filter Fn2060 10 06
Looks nifty :
http://www.schaffner.com/components/...0%20e%2054.pdf

Last edited by hitsware; 31st May 2012 at 02:08 AM.
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Old 31st May 2012, 02:04 AM   #23567
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Bonsai, you mean well, so I will explain. The split bobbin low coupling capacitance transformers that we use, do NOT have or need a screen, because of the large physical spacing between primary and secondary.
The Harris hi speed-soft recovery diodes don't appear to need any snubbers, but I would not question someone adding them.
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Old 31st May 2012, 02:30 AM   #23568
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What we used. I hope it explains a few points.
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File Type: jpg split-tran.jpg (225.4 KB, 208 views)
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Old 31st May 2012, 03:15 AM   #23569
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Quote:
Originally Posted by john curl View Post
What we used. I hope it explains a few points.
Why not the dual split bobbins?

se
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Old 31st May 2012, 03:18 AM   #23570
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if you mean "semi-toroidal" C core with "balanced" dual pri/sec bobins on each leg they actually have higher pri-sec C
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