[time-nuts] Re: Temperature accuracy / repeatability / drift of double ovens

[Bob Camp]

Hi

They tried that (cooling vs heating) back in the 1950’s. It created more issues 
(heat sinking the lossy TEC’s, poor TEC reliability, ….. ) than it fixed. 

Bob

> On Mar 31, 2023, at 10:22 PM, Ed Marciniak via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Yes, that’s the one. A bit expensive, but current production.
> 
> My guess is it's probably used for DWDM lasers in telecom.
> 
> That said, call your local office and ask for a couple samples.
> 
> I still think it would make a fine way to use AT cut crystals instead of SC because it will no longer matter if the crystal you have happens to have a turnover above or below rooom temperature....and there are two turnover temperatures...you could use either of above ambient is no longer a requirement.
> 
> Get Outlook for iOS<https://aka.ms/o0ukef>
> ________________________________
> From: Lux, Jim via time-nuts <time-nuts at lists.febo.com>
> Sent: Friday, March 31, 2023 6:27:59 PM
> To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
> Cc: Lux, Jim <jim at luxfamily.com>
> Subject: [time-nuts] Re: Temperature accuracy / repeatability / drift of double ovens
> 
> On 3/31/23 4:04 PM, Richard (Rick) Karlquist via time-nuts wrote:
>> I believe that IC went out of production decades ago.
>> 
>> Rick
>> 
> https://www.analog.com/en/products/ltc1923.html#product-overview
> 
> 
> High Efficiency Thermoelectric Cooler Controller
> 
> Example circuit is 0.01degree.
> 
> Eval boards available too DC388C and DC491A
> 
> 
> Looks like a $40 part, with a $150 eval board.
> 
> 
> 
> 
> 
> 
>> On 3/31/2023 11:13 AM, Ed Marciniak via time-nuts wrote:
>>> Linear technology made a thermoelectric full H bridge temperature
>>> controller. At the time, I’d like to say it came as a lot of two
>>> components. The second was an op-amp that may have been selected or
>>> trimmed unless there was a good reason to include it with samples
>>> (maybe less commonly available).
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