[sdiy] Tempo suppliers

[John Cronan]

Terry,

Have you considered eliminating the tempco using a chip thermostat, or
alternatively, active compensation with measurements of the die
temperature? You need a larger array, but I wonder if 3-4 transistor
arrays (as opposed to duals) are at this point better future proofing
than precision spec resistors, even in surface mount. I'm thinking of
the THAT arrays, I guess.

There's some good info on these techniques that can be found online
with a bit of searching. I can dig some of that up from old bookmarks
if you're interested. I don't have experience with it myself, but it's
something I've wanted to try for a while now.

John Cronan



On Thu, May 16, 2013 at 12:42 PM, Terry Shultz <thx1138 at earthlink.net> wrote:
> Hi J.Pierre,
>
> Thanks,
>
> Precision Resistor looks pretty good.
>
> 1K 1% @ 3500ppm should be okay.
>
> I was using Q81 devices 1k 1% @ 3300ppm, I wonder what the inpact of a 3500 vs. 3300ppm ail be in calibration and Initial Freq. settings on VCO/VCF.
>
> best regards,
>
> Terry Shultz
> thx1138 at earthlink.net
>
>
>
> On May 16, 2013, at 7:49 AM, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:
>
>> http://www.precisionresistor.com/
>>
>>
>> Le 2013-05-16 10:41, Terry Shultz a écrit :
>>> Hi folks,
>>>
>>> I am almost out of 1k temco's from tellabs.
>>>
>>> As my new designs will be surface mount in some cases, I am searching
>>> for a good supply source of tempco's.
>>>
>>> What are some of you using for vendors?
>>>
>>> Possible group buy or resale of parts could be possible.
>>>
>>> I am looking at Bourne pot's and trimmers.
>>>
>>> If others are interested let me know so I can order extra.
>>>
>>> Regards,
>>>
>>> Terry
>>>
>>> Sent from my iPad
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