uA726 replacement, CEM 3340, etc.

[Paul R. Higgins]

Thanks to everyone who sent info on the CEM 3340.  I'm going to download the 
datasheet.  I can't believe I threw mine away years ago. 

I still have one question, though: does anyone know what the deal is about the 
3340 running so warm?  That is probably why I was told (erroneously) that the 
3340 had a substrate heater.  I have heard anecdotal reports that thermal 
dissipation is an issue with this IC (see previous posts).

I would also be interested in hearing about people's experiences with substrate 
heaters (e.g. heated 3046s) vs. tempcos.  Someone also mentioned the high 
temperature that the 726 ran at; surely you don't have to abuse a 3046 that way 
(or a 726 for that matter) to get the benefit of a thermally stabilized expo.  
Barry Klein has a good example of a thermostatically controlled heater in his 
book ("Electronic Music Circuits").  And of course, Tom G has used heated 3046s 
in his VCOs.  (I'm building a modified version of his Mad Mouse right now, and 
I'm considering adding a heater to the VCOs).


Regards,
PRH

Paul Higgins
email: higg0008 at tc.umn.edu
University College, University of Minnesota