I’ve had excellent luck using big old power FET heatsinks coupled to Peltier junctions and using foam enclosures over voltage or clock sources. It’s wild to see how controlling temp can increase precision of almost anything, like bridges made from from hand-picked components, or actually getting rated accuracies from crystals.

If you put big peltier junctions at the end of the sink and smaller junctions near the payload, you can use multiple temp sensors to regulate temp down to amazingly small fluctuations.

You don’t need to be super precise, but the idea is to hold the exterior wings within a degree or two and then use the smaller devices to decrease fluctuations near the core. By using multiple devices, you can get pretty impressive performance and deal with fluctuations.

Of course, trying to hold living cells at a given temp in a bath of circulating plasm might not be something everyone does, but it would let you cook perfect soft boiled eggs every time…

I was just thinking to myself “You can make crystals in an oven?”

Have a look at this other option:

http://www.romanblack.com/xoven.htm

i wonder if they make crystals with this temperature stabilization option…

Well let’s see some crystals then!

So he made a transistor heater big deal…
All we want to cool our equipments.

If you want to make a goddamn hot transistor just get an lm317 put 1 amps through it and it will be motherfuking hot…

@Nick

Peltier for active temp management is a bit of a drag, because you have to control current in the process, and you have limits to what you can accomplish with that because all a peltier device really consists of is a bunch of thermocouple junctions. If you pass too much current, you’ll melt/blow the joints between the metal junctions.

Keep in mind that our application required precise temp control above all else (certain kinds of cells don’t like being hit with XXXX if it gets too warm, and when it’s too cold they don’t want to play nicely) so we had to play games with thermal coefficients and dissipation.

In gross form, you use big honking peltier devices on the wings with one side bonded hot and one side bonded cold. You drive them using a big table of sine wave values so that you’re steering the temp and not wasting current fighting the other peltier device. Then you select values from the table based on a log curve and use ordinary PID control to drive it.

Then, more towards the center of the device, you stick junctions (again, any junction is a peltier device) and drive those independently. The single junctions allow incredibly fine tweaking. In the ring before that you put your sensing devices, which are very very fast.

This allows you to detect rises, which can be mitigated long enough for the big devices to cool it all down if thermal loads start swinging for the bleachers. Probably overkill, but it got the job done.

In general, we used ordinary AC to hold temps to within 4-5C range in the room, then a pid controller/fan setup (later abandoned as redundant), then the peltier chamber.

The hot side peltier devices used fans (remember, we had room a/c) and the cold side could have used Nitrogen, but we didn’t need that kind of cold.

It was sad to see that thing dismantled.

@Nick – I laughed at “picking up AM radio”
Remember, it’s all baby steps until you’ve made all the easy mistakes.