[sdiy] 7915 regulators

[Tim Ressel]

To all,

Analog Devices put out an article on this. They say to
rig a transistor as an emitter follower to drive the
power supply pins of opamps. 

Verbal schematic: collector to +V, emitter to opamp PS
pin, base has 10K to +V and 0.1uF to gnd. NPN for
positive pin, PNP for negative. This is a solution to
a PSRR problem in low noise circuits, but it applies
here, too.

--TR

--- Jay Schwichtenberg <jays at aracnet.com> wrote:
> Don,
> 
> First off I got the Linear Tech regulators wrong.
> They are the
> LT1085/LT1033.
> 
> Keep in mind that these are 'audiophile quality'
> regulators and are low
> current. About 100 ma. Some people go as far as
> having a regulator on each
> op-amp. They are 'variations on a theme' of Sulzer
> regulators which were
> discussed in Audio Amateur. The design goals for
> them were low noise, high
> line rejection and low output impedance.
> 
> There are 4 initial articles total on the subject:
> 'Regulators for
> High-Performance Audio'.
> 
> Audio Amateur, One:1995, Walt Jung
> Audio Amateur, Two:1995, Walt Jung
> Audio Amateur, Three:1995, Jan Didden
> Audio Amateur, Four:1995, Gary Galo
> 
> Latter there was an update where a startup problem
> was fixed and newer
> op-amps used in:
> Audio Electronics, Four:2000, Improved
> Positive/Negative Regulators, Walt
> Jung.
> 
> I found the new schematics at:
>
http://headwize.powerpill.org/ubb/showpage5.php?fnum=3&tid=3214&fdays=20&sti
> me=0
> 
> 
> Here are some other links I found on the WEB:
>
http://hitechnetworks.net/bwaldron/audioelectronics/sb1_regulator.htm
>
http://www.printedelectronics.com/discussion/discussion_papers_psupply.html
> 
> Jay
> 
> 
> > -----Original Message-----
> > From: owner-synth-diy at dropmix.xs4all.nl
> > [mailto:owner-synth-diy at dropmix.xs4all.nl]On
> Behalf Of Don Tillman
> > Sent: Sunday, October 20, 2002 2:24 PM
> > To: jays at aracnet.com
> > Cc: synth-diy at dropmix.xs4all.nl
> > Subject: Re: [sdiy] 7915 regulators
> >
> >
> >    > From: "Jay Schwichtenberg" <jays at aracnet.com>
> >    > Date: Sat, 19 Oct 2002 11:58:58 -0700
> >    >
> >    > I read a lot on 78XX/79XX regulators and gave
> up using them on
> >    > anything that is remotely serious. There was
> an article on power
> >    > supplies for audiophiles in Audio Amateur by
> Walt Jung and Jan
> >    > Didden (sp?) that made me give up on them.
> Basically it said the
> >    > 78/79 were junk, LM317/LM337 were better and
> LT1086/LT1175 were
> >    > tolerable in audio.
> >
> > Hmmm, "junk", "better than junk" and "tolerable". 
> Did the article
> > mention any approaches that were especially good?
> >
> >   -- Don
> >
> > --
> > Don Tillman
> > Palo Alto, California, USA
> > don at till.com
> > http://www.till.com
> >
> >
> 
> 


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