uA726 replacement

[Grant Richter]

I would like to thank jbv for even trying to get a
group buy together. It's a shame it didn't work out
but the work he put into it is certainly appreciated.

The uA726 is a thermostated NPN matched pair in
a top hat can. A reasonable substitute would be a
thermostated LM3046 or MAT02 transistor array with the
pins brought out to the appropriate copper pattern.

The problem is the uA726 did not require -15 volt
for thermostating. The heater operated between
+15 and ground.

The question is: Is there a LM3046/MAT-02 thermostating
scheme "blessed" by this group, and can you get it
to run using a single supply op-amp?

----------
> From: Andrew Schrock <aschrock at cs.brandeis.edu>
> To: Mike Granger <mgranger at greenville.infi.net>
> Cc: jbv <jbv.silences at wanadoo.fr>; Quinton Fulsom <qfulsom at usa.net>;
synthDiylist <synth-diy at mailhost.bpa.nl>
> Subject: Re: Bad news : Ua726 depleted
> Date: Thursday, August 12, 1999 3:59 PM
> 
> If you're going to go this route, isn't there a small-PCB replacement 
> version of the uA726 manufactured? I seem to remember it was produced,
but
> not cheaply, by some UK synth company. Analog solutions perhaps? I forget
> the name, but I seem to remember the price being around $90. Maybe
> somebody should think about a DIY version? 
> 
> Andrew
> 
> -| Andrew Schrock | aschrock at cs.brandeis.edu |-
> 
> On Thu, 12 Aug 1999, Mike Granger wrote:
> 
> > I know this is a long shot, but there was a part manufactured by
National
> > Semiconductor with a part number : LM726; ( I think) and it was
supposedly the
> > equivalent to the uA726. This part was not manufactured for a long
time, but
> > stock of it might exist somewhere. Just a thought.
> > 
> > Mike Granger
> > Greenville SC
> > 
> > jbv wrote:
> > 
> > > Quinton Fulsom :
> > >
> > > > So before we start going off here please verify and post your
"sources" in
> > > > which your deriving comments and defining what I've said.
> > > > Quint
> > > >
> > >
> > > Actually, Quint is right : I just checked my source and the stock
> > > is NOT AVAILABLE ANYMORE (although it was still available
> > > last week when I forward my original offer to AH).
> > > Anyway, if it's true, it really pisses me off to learn that someone
> > > bought the stock the day after my original posting...
> > >
> > > There are other stocks available, but the quote is so high (more
> > > than 10 times the price I announced in my offer !) that it
> > > becomes ridiculous...
> > >
> > > So what's the conclusion to this thing ? I'm not sure...
> > > Actually, I came across that quote for uA726 as I was
> > > looking for other parts, and I thought it could be
> > > interesting to run a group order through the lists...
> > >
> > > It is clear that we've been acting as real newbies,
> > > but was there any other way to run a group order ?
> > > As a humble hobbyist, I wasn't going to invest $3000
> > > before knowing exactly how many ppl would be interested,
> > > and get stuck with 50 or more unsold chips...
> > >
> > > Sorry for disapointing you folks... I'm sure these chips
> > > will reappear on the market sooner or later, but the price
> > > won't be the same...
> > >
> > > jbv
> > 
>