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Am I blind? (shunt reg's for preamp)
Am I blind? (shunt reg's for preamp)
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Old 19th July 2005, 12:15 PM   #1
Onvinyl is offline Onvinyl
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Default Am I blind? (shunt reg's for preamp)

Hi,

everybody seems to think, 'shunt regulators sound best'.

OTOH, browsing trough the forum does not show a single ready-to-build shunt reg, but dozens of integrated, Emitter- or Sourcefollower or Series regulators.

I am aware that shunts source a lot of current and produce a lot of heat on the downside.

I bookmarked a shunt reg from M.Huber which I always planned to adapt for a borbely/pass/curl style preamp, but unfortunately the page has gone

I remember it consists of a current source, followed by a differential pair as a reference/VAS controlling a shunt transistor. It uses some feedback too.

So, if anyone build something like that, and does not mind to share his findings, please do so!

Rüdiger
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Old 19th July 2005, 12:48 PM   #2
jackinnj is offline jackinnj  United States
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Am I blind? (shunt reg's for preamp)
there are a number of people who use the TL431 shunt regulator -- which is good to 100ma -- because they are so widely used they are very cheap (but some RC filtering is required.) Texas Instruments has the designs on their website.
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Old 20th July 2005, 05:00 PM   #3
MRupp is offline MRupp  Germany
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I have a copy of Manuel Huber's schematics plus two pages of comments on the design. E-mail me, I will send you a copy.

By the way, this is not the only shunt regulator (or super regulator) design that you can find on the Internet. For example you can check out this page:

http://www.euronet.nl/~aespreng/Shuntregv11d/
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Old 20th July 2005, 06:23 PM   #4
Onvinyl is offline Onvinyl
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Hi Martin,
thanks for that valuable link! You got mail! *ping*
Rüdiger
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Old 20th July 2005, 07:32 PM   #5
jackinnj is offline jackinnj  United States
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Am I blind? (shunt reg's for preamp)
Quote:
Originally posted by MRupp
I have a copy of Manuel Huber's schematics plus two pages of comments on the design. E-mail me, I will send you a copy.

By the way, this is not the only shunt regulator (or super regulator) design that you can find on the Internet. For example you can check out this page:

http://www.euronet.nl/~aespreng/Shuntregv11d/
Reading the manual -- I would suggest that R18 and R19 be specified as 1 Watt metal film.
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Old 25th July 2005, 08:19 AM   #6
mark_titano is offline mark_titano  Italy
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Quote:
Originally posted by MRupp
IBy the way, this is not the only shunt regulator (or super regulator) design that you can find on the Internet. For example you can check out this page:

http://www.euronet.nl/~aespreng/Shuntregv11d/
Hi guys, really interesting link.
In the manual the suggested op amp is the opa655P and the author say that is not possible to substitute it with others op amp.
But that op amp is discontinued, replaced by the opa656.

http://focus.ti.com/docs/prod/folders/print/opa655.html

http://focus.ti.com/docs/prod/folders/print/opa656.html

Now, TI says that the 656 is "an EXACT EQUIVALENT in functionality and parametrics to the compared device (655)" so can I use it in place of the 655 without modifications?

Mark
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