); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Nah, not for this application. A Peltier module typically has a COP of 1. That is, it moves a watt of energy for each watt consumed. Thus, for each watt moved, two watts have to be dissipated to air.
I can't imagine a well-insulated quartz oscillator needing more than a watt or two of cooling at the most. A heat sink capable of handling 4-5 watts should do the job just fine. Don: I've seen peltier-controlled "ambient" ovens before but I can't recall the details. I'm fairly sure one was a Fluke precision voltage transfer standard in which the zener reference diode was controlled to a constant temperature. The advantage of using room temperature, e.g., 70 deg F, is that under most conditions, the peltier module is doing little to nothing, perhaps just ridding the ovenized unit of the few milliwatts dissipated in the circuit itself. I've used multiple cascaded modules to cool a nuclear detector (Silicon surface barrier diode) to reduce its noise. Not as good as LN2 but much cheaper to operate. John On Sat, 13 Oct 2007 13:26:52 -0700, Brooke Clarke <[EMAIL PROTECTED]> wrote: >Hi Don: > >They are very inefficient to the point that a system that's supposed to cool >something may heat it because of all the heat generated by the module. > >It takes a huge amount of heat sinking or liquid cooling to get them to work. >Don Collie wrote: >> ); SAEximRunCond expanded to false >> Errors-To: [EMAIL PROTECTED] RETRY >> >> Has anyone concidered using a small Peltier pile to maintain the crystal`s >> temparature. I understand that these devices will heat or cool, so it would >> be possible to maintain the crystal temparature at , say, 25 degrees >> celcius, over a range of ambient temparatures >> [perhaps 0 to 70 degrees]. There would be several advantages in this >> approach. -- John De Armond See my website for my current email address http://www.neon-john.com http://www.johndearmond.com <-- best little blog on the net! Tellico Plains, Occupied TN I like you ... you remind me of me when I was young and stupid. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
