Can I use a POT to vary the inductance of coil.......... - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 20th May 2005, 03:24 AM   #1
diyAudio Member
Join Date: Mar 2004
Location: Cleveland, OH
Default Can I use a POT to vary the inductance of coil..........

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..............
  Reply With Quote
Old 20th May 2005, 03:46 AM   #2
hacknet is offline hacknet  Singapore
diyAudio Member
Join Date: Nov 2002
Location: sg
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.
  Reply With Quote
Old 20th May 2005, 06:41 AM   #3
diyAudio Member
BassAwdyO's Avatar
Join Date: Jun 2004
Location: Illinois
Send a message via AIM to 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?
The golden rule of DIY:
Build nice, or build twice!
  Reply With Quote
Old 20th May 2005, 10:33 AM   #4
diyAudio Member
Join Date: Mar 2004
Location: Cleveland, OH
Default pots

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.

  Reply With Quote
Old 20th May 2005, 12:16 PM   #5
diyAudio Member
Join Date: Oct 2000
Location: The People's Republic of Maryland
A simpler solution might be to go to the Madisound sale page:
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.
  Reply With Quote
Old 20th May 2005, 12:43 PM   #6
AuroraB is offline AuroraB  Norway
diyAudio Member
AuroraB's Avatar
Join Date: May 2001
Location: Norway, -north of the moral circle..
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..

Make another section with inductance, and use single switches instead of rotarys, and you can make all the permutations you need..
  Reply With Quote
Old 20th May 2005, 01:43 PM   #7
diyAudio Member
jackinnj's Avatar
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
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.
  Reply With Quote
Old 20th May 2005, 03:05 PM   #8
rabbitz is offline rabbitz  Australia
diyAudio Member
rabbitz's Avatar
Join Date: Jul 2003
Location: Newcastle, Australia
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.
Attached Images
File Type: jpg series xo rig.jpg (36.4 KB, 83 views)
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
HiVi B3s voice coil inductance - How to calculate? chylld Full Range 2 15th January 2009 07:10 PM
FE127E voice coil inductance for Zobel calculation arjscott Full Range 3 7th February 2007 01:42 AM
Measuring voice-coil self-inductance Klimon Multi-Way 4 19th November 2006 12:23 PM
voice coil inductance VS transient response kan3 Multi-Way 12 9th February 2004 08:18 PM
Voice Coil Inductance (Le) and Transient Responce amo Multi-Way 11 8th June 2003 07:45 AM

New To Site? Need Help?

All times are GMT. The time now is 08:00 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2