[time-nuts] digital pots Part 2

[Graham / KE9H]

Check out the Vishay-Spectrol  Model 533, 534, 535  Family.

Seem like good quality, good specs.

example: 10K, 10 turn, under $18
Mouser: 594-53411103

--- Graham

==


On Wed, Jan 29, 2020 at 7:34 PM Perry Sandeen via time-nuts <
time-nuts at lists.febo.com> wrote:

> Learned Gentlemen,
> I appreciate all the reply's to my questions.
> Perhaps I should have added a bit more detail of my planned project after
> moving.  I have 5 Lucent XO's and two Lucent Rb's which I want to add panel
> mounted fine EFC controls.
> I did consider Bourn's Helipots, but found used on ebay were $20 to $30
> each and none had more than two for sale.  I did look at the ebay Bourn,s
> *tribute* pots with dials from China which seemed to have the exact same
> item from $10 to $2 (with free shipping). I remembered that Charles
> Steinmetz had posted to the list that he found many of a lot he purchased
> were defective.
> So I went alookin (southern USA term for searching) for a viable
> alternative, hence the Maxim DS 1804 non-volatile 10K pot with 100 taps
> that has a simple toggle up or down interface. (I have no ability to do
> serial or computer control.  I found a Microchip AN 691 which showed how to
> use two or three digital pot in series/parallel configurations.
> Three DS 1804's and a good reference IC for less than $10. A simple TL431
> or LM723 heater circuit would be $2.  So with 100 taps on each IC, I
> figured (with lots and lots of toggling). I could achieve sub-millivolt or
> better tuning steps.
> And I was fairly certain that fine EFC tuning was like grandma getting
> ready for church on Sunday.  She was ready when she was ready. No amount of
> fussing or cajoling could change that. It occurred on her time (slow) table.
> Comments appreciated.
>
> Regards,
> Perrier
>
>
>
>
>
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