a choke question

[joeboo88]

Happy weekend. I have just started building amps, and have a whopping 2 under my belt. My father in law just gave me some chassis's and various parts. 1 is a big choke. It says on it.....23-21 and underneath 450. would this thing be like 23H @ 450? What can this big choke be used with? Thanks in advance. Glenn

[Stevem]

What does it ohm check at?

[joeboo88]

it measures at 92.5 ohms

[Phil_S]

Doubtful that those numbers mean very much. Here are some ways to figure it out:
http://www.dos4ever.com/inductor/inductor.html
http://www.wikihow.com/Measure-Inductance
This one doesn't require an o-scope and has some handy-dandy calculators: http://daycounter.com/Articles/How-To-M ... ance.phtml
If you've read through, nothing new here, but written a bit more scientifically.
http://meettechniek.info/passive/inductance.html
Google for "measure unknown inductor" and you'll get lots of hits, mostly the same 3 methods and also youtube videos.

For a sine wave generator, you can rig up an old computer with freeware, cell phone app (be careful), walkman (burn a CD with sine waves), etc. You don't need to buy a sig gen and that with a DMM should allow all the testing needed.

[joeboo88]

thanks Phil

[trobbins]

If it is a choke for HT supply, then you'll likely want to get an idea of inductance versus dc current. This article may help:

http://dalmura.com.au/projects/Choke%20measurement.pdf

[angelodp]

Great, reference articles, thanks guys. Maybe should go in the stickies if not already.