I bought it at a physical store last summer. It was on a shelf for $20 with other picnic things. Chinese, of course. It takes a 6-pack of coke and if it's cold outside (50F) cools enough to freeze after a day of operation.
Outside it's anout 8" x 14" x 10" high (from memory). Black plastic. It runs of 12 VDC at about 3 A. It includes a power supply (noisy switcher) for line operation. There is a HEAT/OFF/COOL switch. I looked a few weeks ago and Target and Best Buy both had similar units (a bit bigger) for about $100. Ask the Walgreens store manager. FWIW, -John ============ > Can you be a little more specific about the cooler ? Walgreens > search function is rather laborious and clumsy. > > Tnx, Dick, W1KSZ > > > -----Original Message----- >>From: "J. Forster" <[email protected]> >>Sent: Dec 24, 2009 6:58 PM >>To: Discussion of precise time and frequency measurement >> <[email protected]> >>Subject: Re: [time-nuts] Cheap Rubidium (heatpipe cooling for) >> >>That's why I've been suggesting active control with TE devices. >> >>You can buy a small TE cooler at Walgreens for about $20. It's big enough >>for a 6-pack of Coke cans and already comes in an insulated box. Add a >>simple temperature control in series w/ the DC supply and you should be >>well on the way. >> >>-John >> >>================= >> >> >>> Hi >>> >>> The original intent was to simply take an existing "cheap" rubidium and >>> do >>> simple things to it. Tearing it into pieces and redesigning parts of it >>> was not anything I originally contemplated. The tight integration of >>> the >>> physics package to the electronics would make this a fairly involved >>> process. >>> >>> Bob >>> >>> >>> On Dec 24, 2009, at 5:42 PM, Magnus Danielson wrote: >>> >>>> Hal Murray wrote: >>>>>> A heat pipe might work if the fluid had a sufficiently low boiling >>>>>> point. The rubidium isn't terribly tolerant of high temperatures, >>>>>> and >>>>>> I'm going to pick up some heat rise as I put it inside some baffles >>>>>> / >>>>>> shields. You need to find something that fits a fairly narrow >>>>>> window. >>>>> This is all backwards. >>>>> The main reason the typical Rubidium box needs a serious heat sink is >>>>> that there is an active heater inside it heating up the lamp to get >>>>> it >>>>> up to operating temperature. That part of the system better be >>>>> "tolerant" of high (enough) temperature. >>>> >>>> ... or a less heat-producing alternative could be used. The >>>> Rubidium-lamp produces two wavelengths of which one is filtered by a >>>> Rubidium-filter which leaves the final pumping wavelength. This is >>>> what >>>> a laser diode could supply instead. >>>> >>>>> Maybe things would be a lot better/simpler if the heating/cooling we >>>>> have been discussing were split into two sections. One for the lamp >>>>> assembly, and a second for the electronics. >>>> >>>> Most of the discussion has been on thermal isolation of the entier >>>> units. Not what needs generates temperature and what requires >>>> temperature stability etc. >>>> >>>>> Anybody know what the thermal coefficient of the lamp is relative to >>>>> the electronics? >>>> >>>> I am not sure I know what you mean by this... >>>> >>>> Cheers, >>>> Magnus >>>> >>>> _______________________________________________ >>>> 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. >>>> >>> >>> >>> _______________________________________________ >>> 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. >>> >>> >> >> >> >>_______________________________________________ >>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. > > _______________________________________________ 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.
