Can I use a POT to vary the inductance of coil..........

[Gavinator68]

I want to be able to use a pot so i can make one large inductor and use it for testing of 1st order series x-overs. Is this a viable prospect? I need the help please..............

[hacknet]

i`ve heard of multi tapped inductors used in this application but rarely one that can be varied like a pot. i doubt its possible with such large values required for a crossover.

[BassAwdyO]

Pots vary resistance, not inductance...

In a LCR circuit the frequency response is a factor of all three variables.

For a first order low pass filter you will simply have an inductor and a speaker element. Which is what I assume you're trying to make? I dont know how or what you're testing, but frequency response of the speaker would probably be the best thing to test.

What exactly are we trying to accomplish here as the ultimate goal?

[Gavinator68]

I thought that might be the case. I was thinking that if I had the abbility to build a crossover testing board w/ a variable inductor, multiple L-pads, and zobels that I MIGHT be able to limited my parts changing while trying to come up w/ good crossover values for any given drivers. I did locate industrial variable inductors and thought that maybe I could apply the same principles of construction but use 10 or 12 awg wire to make one large inductor.............say something around 2.0 or 3.0mH and adjucst it as I tested. Hopefully.................i am really new to this and if it could be done with any good results then it has probably been done already.

David

[jbateman]

A simpler solution might be to go to the Madisound sale page: http://www.madisound.com/cgi-bin/ind...%CArt_id%25%25
and buy a half dozen or so of the inductors listed there. For around $15 you could get a decent selection, which can be used individually or in combination (in series) to obtain larger values.

Just mount them to a board with some caulk or flexible adhesive, and use alligator clip wires to connect them as needed.

[AuroraB]

See post above... OR..

Make a full blown test box, with L's, C's and R's in the range you need,

this describes roughly what I mean..
http://sound.westhost.com/project82.htm

Make another section with inductance, and use single switches instead of rotarys, and you can make all the permutations you need..

[jackinnj]

Genrad "inductance substitution" boxes are for sale all the time on EBay.

you can also buy one large inductor, partially unwind, and tap it.

btw, the Heath RLC bridge is still inexpensive on EBay -- it isn't a Genrad or HP, but will get the number correct within a few percent.

[rabbitz]

Just make a series xo rig on a piece of MDF, some terminals and wire.... clips instead of terminals if you like. Change over components in seconds.