That's a large inductance for OTS variable inductors. What range of inductance are you looking for?. J W Miller does custom jobs,
-- Tweetldee Tweetldee at att dot net (Just subsitute the appropriate characters in the address)
to
in
That's a large inductance for OTS variable inductors. What range of inductance are you looking for?. J W Miller does custom jobs,
-- Tweetldee Tweetldee at att dot net (Just subsitute the appropriate characters in the address)
to
in
Thanks for the lead, I'll check them out. We need about +/-5%.
These are used in classrooms, to teach students about phase shifts and tuned circuits. We could adapt to a range of values, considering our generator is limited to 20 kHz and lower.
-John O
Can I suggest that you use a tapped inductor with a switch ?
L is proportional to the number of turns squared.
The inductance of an inductor of this type is dominated by the air gap. The magnetic properties of the air gap is constant and therefore repeatable.
I have seen ferrite pot cores with tuning slugs that were used before switched capacitor filters and dsps. I think that these are no longer available.
Regards,
John
Yep, that's what we're finding, too. I think we started using this kind of coil back when we put them in radio kits, which allowed us to do a bunch of RL & RLC tuned circuit experiments. Our search isn't going well, so it looks like the days of tuning resonant circuits under 20 KHz are over. :-)
John O
see also private email
of
looks
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.