I have been trying to find some inductors, but I have been having trouble. I am looking at Bob Moog’s design for the EM Theremin (https://www.cs.nmsu.edu/~rth/EMTheremin.pdf), but some of the parts no longer seem to be manufactured. In particular, I am talking about L7 – L10 from this parts list:
These inductors are connected in series with the antennae. I am not very familiar with RF design, but I believe they are acting as an “antenna coil.”
I managed to find the 10 mH AIAP-02-103K, but I’m having trouble determining if any 2.5 or 5 mH inductors would be equivalent to the discontinued J.W. Miller products. I see a few on the site with equivalent inductance, but they seem to be large devices with high current ratings that cost upwards of $30.00 each. I was hoping to find something cheaper.
I have two questions:
- Is there a modern equivalent to these inductors?
- I know that in theory parallel 10 mH inductors could create the required inductance, but would it be practical to use several closely-situated inductors in an RF circuit?
Thank you for taking the time to read my questions.