Inductor estimation? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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
Reply
 
Thread Tools Search this Thread
Old 13th March 2008, 02:44 PM   #1
diyAudio Member
 
▀art West-VL.'s Avatar
 
Join Date: Jun 2005
Location: West Vlaanderen
Default Inductor estimation?

Lucky enough I found two inductors in the garage, steel laminate, with the number
201 175Z1108 and the number 30 on it a bit further and smaller printed.
Its dimensions are (steel laminate only) 55mm wide, 66mm high 23mm thick
With the windings, the thickness is about 44mm
height of the winding 30mm and 41mm wide.
thickness of the wire is 1.7mm, incl. the varnish , that calculates to 2.27mm▓
So I think this is 14 gauge wire (1.63mm / 2.08mm▓)
With a basic DMM I measure no resistance at all, even if I put both in series, still 0.0 Ohm...

How can I estimate the inductance of this inductor?

Bart
__________________
Break in your loudspeakers at 35% RMS power Right-click'save as...'
Brown noise mono 192kbps(hit "repeat")
  Reply With Quote
Old 17th March 2008, 09:16 PM   #2
diyAudio Member
 
▀art West-VL.'s Avatar
 
Join Date: Jun 2005
Location: West Vlaanderen
No one who would try?
Do you need more info? What info?

Bart.
__________________
Break in your loudspeakers at 35% RMS power Right-click'save as...'
Brown noise mono 192kbps(hit "repeat")
  Reply With Quote
Old 19th March 2008, 11:17 AM   #3
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Quote:
Originally posted by ▀art West-VL.
No one who would try?
Do you need more info? What info?

Bart.

Yes, a lot more info....how many turns, DCR, properties of the core.....


Why don't you just find some guy with a LCR meter and measure it?

Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 19th March 2008, 12:02 PM   #4
diyAudio Member
 
PigletsDad's Avatar
 
Join Date: Jul 2007
Location: South Worcestershire
If you have a scope (or DVM with accurate AC response) and signal generator, it is not too hard to do a rough measurement.

Remember that the impedance of an inductor is 2pi f L.

If you set the signal generator to say 1V output, and connect it to the inductor via a 1K resistor, you will get 1mA of current (lets call this I), provide the impedance is much less than 1K. Adjust the frequency so that the voltage (lets call this V) on the inductor is less than say 100mV. At this frequency, the impedance is V/I.

Divide the impedance by 2pi x frequency, and you have the inductance (fairly roughly).
  Reply With Quote
Old 19th March 2008, 07:31 PM   #5
diyAudio Member
 
▀art West-VL.'s Avatar
 
Join Date: Jun 2005
Location: West Vlaanderen
Quote:
Originally posted by Magura



Yes, a lot more info....how many turns, DCR, properties of the core.....


Why don't you just find some guy with a LCR meter and measure it?

Magura
All that is in the first post, except for the #turns, but that would be ridiculous because I would have to unwind it to find out.
An LCR meter would be nice, he he!
Maybe I should just buy one...


Quote:
Originally posted by PigletsDad
If you have a scope (or DVM with accurate AC response) and signal generator, it is not too hard to do a rough measurement.

Remember that the impedance of an inductor is 2pi f L.

If you set the signal generator to say 1V output, and connect it to the inductor via a 1K resistor, you will get 1mA of current (lets call this I), provide the impedance is much less than 1K. Adjust the frequency so that the voltage (lets call this V) on the inductor is less than say 100mV. At this frequency, the impedance is V/I.

Divide the impedance by 2pi x frequency, and you have the inductance (fairly roughly).
Thanks for the 'how to' I'll have to try that in the weekend.

Bart.
__________________
Break in your loudspeakers at 35% RMS power Right-click'save as...'
Brown noise mono 192kbps(hit "repeat")
  Reply With Quote

Reply


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
Copper coil inductor vs. round core inductor tomchaoda Pass Labs 7 21st September 2011 04:42 AM
air core inductor vs. iron core inductor WBS Planars & Exotics 5 7th May 2007 11:02 PM
KT88 Lifetime estimation Salas Tubes / Valves 4 3rd March 2007 12:18 AM
Volt Amp Estimation bjackson Parts 8 5th August 2005 02:40 AM
heatsink estimation elizard Everything Else 4 11th June 2003 06:48 AM


New To Site? Need Help?

All times are GMT. The time now is 12:21 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ę1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2