uA726 replacement

[Rick Jansen]

In message <199908131701.MAA24462 at pop01.execpc.com> you write:

> 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?

Actually, doing a small replacement PCB for uA726 isn't
a bad idea at all. Maybe the MAT-04 is a chip suited better
than the 3046, but it's single source only. In my Moog filter
I built in temperature compensation a la the National Semi 
application note, based on 3046. This requires an LM329
temperature stabilized zener. Single source too, but replacements
are available.

On the uA726 topic: I have built a Formant with 6 VCO's, and 
I've acquired a few extra back then for future VCO-expansions.
As things are now I think I won't build more Formant VCO's,
as I don't particularly like the design any more. (Using a
TTL Schmitt trigger was not great from the start, and another
source for temperature instability!) All in all, I have some
uA726 left as "backup". If YOU have a dear synth with a broken 
uA726 then contact me. Please do not regard this as an offer
to sell uA726's to build new synths with, I don't have that 
many to spare! I see in jbv's list that a total of 100 uA726
are wanted (at least), but I don't have that magnitude of them
by far. So, to REPAIR a broken synth, contact me.

Rick Jansen
__
rick at bpa.nl rja at euronet.nl   http://www.euronet.nl/~rja/
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