Expo conv. heater (tomg et al.)

[BJ]

Steve Varner wrote:
> 
> I haven't built a discrete VCO yet (just CEM chips in a kit VCO). I want
> to build a 3046/thermostat circuit, but I have a few questions.
> 
> 1. Do you really need a separate power source for the heater part?
> That's a real pain in the rear. You mentioned regulators and I've seen
> separate supplies mentioned on the web... so that's why I want to know.
> 
> 2. Barry Klein suggested putting the 3046 under a styrofoam cover to
> isolate the chip from heat loss or gain - sort of a chip calorimeter.
> Has anyone done this?
> 
> 3. How do you know where to set the temperature trim on the thermostat?
> I mean, how do you know where to set the temperature and how do you
> measure a silicon chip's temperature accurately anyway? Not having the
> temp too high or low was discussed, so this is important.
> 
> PS, if you folks lived in San Diego instead of 2 degrees from the Arctic
> Circle you might not worry so much about temperature   ;-)
> 
> SV

Well, today i have -24 deg C and i heard on the national radio
broadcast that there have been cooldnes records set for scandinavia
with -51 deg C in Karesuando Sweden, and -52.2 deg C in Sodankylää,
Finland!!!

So we might just start to heat up our LM3046 tripple expo ovens over
here at:
http://home8.swipnet.se/~w-88660/schpcb.htm


BJ (in "not go out side the house country" untill spring time!!) 

Hmm, perhaps one could test the oven now outside the house instead 
of using freese spray!! :)