what do inductors do?

Posted: 3/4/2007 7:54:59 PM

From: melbourne, oz

Joined: 6/10/2005

i was wondering if someone could help explain (to an electronics beginner...) exactly what inductors (coils) do, and how they are useful in theremins.

here's some specific questions that have come to mind:

- how do inductors make the effective length of an antenna longer? is it just because they are long bits of wire coiled up into a smaller space?

- is there a mathematical method of calculating how many mH worth of inductors will be needed for a particular antenna in a particular theremin?

- looking at the Etherwave schematic, why does the variable pitch oscillator use 4 x 10mH inductors in series on the pitch antenna, rather than, say, one 40mH inductor? and does their physical orientation make any difference?

- how do you make an inductor of a specific value? does it have something to do with the number of turns of wire? how do you measure the inductance? and what's the best sort of wire to use?

hmmmm... so many questions! if anyone is able to help out, or point me in the direction of some easily understandable literature on the subject, i'd be very grateful!

Posted: 3/6/2007 6:33:40 PM

From: Florida

Joined: 11/24/2006

Does this help?

Posted: 3/8/2007 3:44:42 PM

From: New York, NY

Joined: 2/13/2005

Well it helped me thanks.
At least up to the "This is given by:...where L is inductance and I is the current flowing through the inductor." parts.

They look like tiny coils that are in the Moog theremins now.

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