[time-nuts] Voltage standards

[Lux, James P]

On 11/30/08 5:29 PM, "Brian Kirby" <kirbybq at bellsouth.net> wrote:

> A cryo may  be hard to put togather  (and maintain - from experience)
> but there are plenty of peltier junctions/devices out there...
>
> Brian KD4FM
>
> Lux, James P wrote:
>> Cost wise, I like the snippet I read in Scientific American a decade or so
>> ago.. LN2 is the cost of milk, LHe is the cost of fine scotch whisky
>> Is a obsessive precision worth a bottle of scotch?
>>
>> Jim

Can't get that cold with Peltiers.. Even 77K is a stretch. You run into a
problem with the maximum delta T from one device, and then having to suck up
the heat from that one.  You wind up with a pyramid shaped stack with
terrible efficiency.

The Melcor website has details.