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 < [email protected]> 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 > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
