To all those time-nuts (volt-nuts as well) who have been chatting about
temperature controlled environments, here is my input.
I found a very neat ready-built controlled oven at a number of hamfests in
the southeast (Florida & Alabama) that work quite well to enclose small
circuits that need to be temperature controled I found them still being
sold by Fair Radio (www.fairradio.com) for only $12 apiece. Schematic is
included to increase their value to us hackers. Their catalog number is
OSC-8004290G1. The outside dimensions of the box is 6.5x2x3.3 inches, with
about 0.5 inches of insulation and inner enclosure.
They were used in Army GRT-21/22 transmitters, and contain all the necessary
temperature control circuitry, as well as a crystal oscillator. I bought a
couple of these gems and removed the oscillator circuitry and had a nice
oven assembly with enough room inside to house a lot of circuitry for just
about any thing requiring close trmperature control. It's designed to run
at 75C, but with a few resistor changes, the temperature can be lowered if
desired. It's insulated pretty well, too.
Not a power miser by any stretch, but it has lots of potential.
Cheers,
Dave M
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