On 9/5/2016 9:48 PM, Richard (Rick) Karlquist wrote:
> As we all know, step #1 in making a clock is NOT > to build a thermometer :-) > > I thought I would check the brain trust here to see > if anyone has seen a hobbyist grade temperature > testing chamber or kit or homebrew design. <deletia> > Rick Karlquist N6RK Another thing I've done in the (distant) past is two cheap foam coolers with a muffin fan between them. fill one with dry ice and control the fan for cooling. This was the essence of the bench coolers when I worked for Collins Radio in the late 70's. In that case they were aluminum boxes with foam walls. They had Edison based wire heaters with porcelain forms. OSHA nightmare, but worked for the task at hand. Used simple bang-bang controllers. There are cheap (~$25) Chinese PID controllers, but as I said, I use the Pico-reflow controller. Almost as cheap and a /lot/ more flexible. Oz (N1OZ, in DFW) -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
