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Old 15th September 2012, 09:20 PM   #1801
Salas is offline Salas  Greece
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P.S. I hope that your dummy load is not 75R again like in the -5V. That would mean -200mA demand @ -15V.
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Old 15th September 2012, 09:34 PM   #1802
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Salas View Post
See if there is continuity between all the Vref series components. If there is, check if one or both Leds there are not correctly oriented. Q203 should be conducting the Iref there, make sure its healthy if all other checks pass.
I have replaced Q203 with no luck.
I traced the Vref chain back from both SENSE (-S and 0) terminals to all components and everything checks out. I made the -15 from the same schematic as the -5, and the same layout. The board should be OK.
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Old 15th September 2012, 09:53 PM   #1803
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Salas View Post
P.S. I hope that your dummy load is not 75R again like in the -5V. That would mean -200mA demand @ -15V.
Salas,

sometimes the obvious isn't so obvious. That's all it was, wrong load.


Oops. Thanks again
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Old 15th September 2012, 10:08 PM   #1804
Salas is offline Salas  Greece
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No worries, I do worse all the time. Post a picture of your self made boards shunts at work if able.
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Old 15th September 2012, 11:31 PM   #1805
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Salas View Post
No worries, I do worse all the time. Post a picture of your self made boards shunts at work if able.
Here's a picture. Excuse the messy boards, haven't cleaned them with flux remover yet. Also, ran out of green LEDs and had to use 1 yellow. As you can see I used a lot of layout space; I don't like components squeezed together.

I haven't listened yet, but confident that they'll "walk the talk". I'm using your HV shunt (PCB from group buy) in the tube stage and it's great compared to the linear I was using before.

Gary
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File Type: jpg Shunt_Regs_Post.jpg (243.3 KB, 296 views)
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Old 15th September 2012, 11:38 PM   #1806
Salas is offline Salas  Greece
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What value are those VISHAY? Polyprop?
What kind of tube stage, line, phono? You mean the SSHV2 reg I guess.
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Old 15th September 2012, 11:44 PM   #1807
Salas is offline Salas  Greece
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Or some I/V tube stage?
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Old 15th September 2012, 11:55 PM   #1808
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Salas View Post
Or some I/V tube stage?
It's powering a TDA1541A , and your SSHV2 is powering a single 6SN7 tube stage.
I'm just completing a 4-layer PCB for the DAC and tube stage. Right now they're on separate PCB's while I test and tweak. Now that all components have been finalized, I'll combine boards.

Those are nice caps. 10uF at 500V. Here's a link:

MKP1848S61050JP2C Vishay BC Components | BC2788-ND | DigiKey
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Old 16th September 2012, 12:39 AM   #1809
Salas is offline Salas  Greece
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500V capacitors on low voltage regs... For the looks?
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Old 16th September 2012, 01:40 AM   #1810
roger57 is offline roger57  Canada
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Quote:
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500V capacitors on low voltage regs... For the looks?
yeah, they do like nice, eh?
They were cheaper than boutique caps (under $6 each), they're MKP and they're Vishay. Seems that most film caps in that range are 300V and higher. I thought that in spite of these being a bit bigger and higher in voltage, the "cool" factor won out. You like them?
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