[Re: thermal tips re expo converters:]

[Haible Juergen]

	>Correct, no doubt. The techniques I'm suggesting serve to decouple
the
	>external temp changes from reaching or disturbing the expo
converter. If we
	>change ambient and the converter takes a half hour to notice, we
win. With
	>high heat loss, or low heat loss the circuits will achieve steady
state. You
	>could even turn the heater power down and still stabilize the loop.
Which
	>factor is more significant, good thermal isolation, or ability to
bleed off
	>excess heat ?  Beats me... what does anybody think ? :-)  Harry
Bissell

	That's a hard question. With less bleed (isolation) and less heater
current
	you would probably get no improovement in regulation time. To
(over?)
	stress the electrical analogy, your thermal system would just become
"higher
	impedance". But even if you can't increase regulation speed, you
would still
	decrease the heater current needed, which is a benefit on its own.

	So, how about isolating a non-heated transistor array ?
	(Rene's differential amp feedback method)

	JH.