[Back again/Thermal considerations of exp]

[Harry Bissell]

I always had the impression that the epoxy-potted boxes (like aries) were as
much to keep out the curious as to give "thermal stability". While it sure
does that, I note that in the case of Aries they also blocked out that portion
of the schematic, I'm sure that was also for "thermal stability". Oh maybe I'm
just too cynical... why would they want to hide the hardest part of the
circuit for the simple hacker to duplicate? I'll have the Big Mac, please...
:-) Harry Bissell

owner-synth-diy at mailhost.bpa.nl wrote:
After a few months of being incomunicado, it's good to be back.  It's nice 
to know that people still care about analogue stuff (sorry I've had to 
become very digital at work).

Back to business.

Appologies if I've missed this but there seems to be potential for the 
scourge of circuit hackers,  epoxy or silicone potting of the converter 
circuit.  Whilst this doesn't change the additional damping caused by the 
thermal loss through the connections  it is a little more elegant than the 
"Big Mac" box enclosure.

Many electronics supply houses sell potting compound and potting boxes that 
are just the right size for the 3046 and support circuitry.

The idea of having a few ready to go, stable exponential convertors appeals 
to me (similar to the Arp units in the 2500, the unit used in the Aries or 
perhaps the  726 replacement offered by Moog Music UK (£20ea I believe).

Regards

Tim
 


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