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Old 30th September 2010, 03:28 PM   #1
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Default Good PSU for HT upt to 15mA??

Dear folks,

I search for a solid state based PSU schematic for stabilized HT of +250V with max 15mA load. Input is ~325V. It should be "silent" means high ripple rejection as possible and as best safe against shorts on output. I want to use this for a small projet to supply only one tube ( ECC82 ) in a small case. As transformers I want to use two EI 38/16 connected against each other. The "middle" voltage of both transformers I want to use to supply the filament.

First unchecked choice was an TL 783 based one. But after reading some threats about this quite old knob I rejected this. I found a few schematic using MOSFET as a linear regulator but this need lot of external parts for a good ripple rejection and stability. The "dream" is to get something like an a78XX for 250V

Does someone of you good fellows know an schematic which fulfil my requests?

Thanks a lot!

Karsten
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Old 30th September 2010, 03:33 PM   #2
SY is offline SY  United States
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How about a Maida regulator? Good performance, simple, excellent reliability.
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Old 30th September 2010, 06:41 PM   #3
Merlinb is offline Merlinb  United Kingdom
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Quote:
Originally Posted by karsten21 View Post
The "dream" is to get something like an a78XX for 250V
Somebody already dreamed it...
http://www.supertex.com/pdf/datasheets/LR8.pdf
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Old 30th September 2010, 09:26 PM   #4
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Quote:
Originally Posted by Merlinb View Post
Somebody already dreamed it...
http://www.supertex.com/pdf/datasheets/LR8.pdf
Internal current limit is 10-30 mA - use one per stage?
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Old 30th September 2010, 10:53 PM   #5
SY is offline SY  United States
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Quote:
Originally Posted by Merlinb View Post
Somebody already dreamed it...
http://www.supertex.com/pdf/datasheets/LR8.pdf
Convenient!

The datasheet is VERY incomplete- for example, there's no line noise/ripple rejection versus frequency data. And load regulation is pretty mediocre. I'll bet their next generation of regs will be just what tube guys need.
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Old 1st October 2010, 12:11 AM   #6
mach1 is offline mach1  Australia
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Salas simpler simplistic shunt reg.
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Old 1st October 2010, 09:37 AM   #7
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Default maida regulator

Hey SY,

THATS it!
I never heard about this name before which might be the reason why I do not find the appropiate threads here...

Thanks a lot! The tasks for this weekend are now save

Best regards
Karsten
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Old 1st October 2010, 01:27 PM   #8
Merlinb is offline Merlinb  United Kingdom
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Quote:
Originally Posted by SY View Post
Convenient!
The datasheet is VERY incomplete- for example, there's no line noise/ripple rejection versus frequency data.
Given that it is limited to <20mA applications, the input ripple can be made puny even before the reg.

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I'll bet their next generation of regs will be just what tube guys need.
Yeah, cuz tube amps are soooo low noise and precise
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Old 1st October 2010, 02:09 PM   #9
SY is offline SY  United States
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Quote:
Originally Posted by Merlinb View Post
Given that it is limited to <20mA applications, the input ripple can be made puny even before the reg.
Actually, one simple application would be for use as a pre-regulator before an RC network. I'd still be inclined to use a Maida, but for apps where the current draw is low, this could save a couple parts.

MY amps are low noise and precise. Reasonably so, anyway.
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Old 16th October 2010, 12:58 PM   #10
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Hey folks, hey SY

Thanks a lot again for the help to find a HT PSU. Attached a picture of the result of your tips. Works fine at Uout 230V@5mA. I cant measre any ripple

Best regards
Karsten
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File Type: jpg k-HTpower 001.jpg (69.6 KB, 78 views)
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