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Old 28th October 2007, 07:05 PM   #1
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Default Wanted: Inductance meter, inductors.

I'm looking for an inductance meter so that I can make my own inductors. Anyone got them?

I also need inductors of the following values:
0.4mH
1.5mH
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Old 29th October 2007, 03:45 AM   #2
john65b is offline john65b  United States
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Go to APEX jr - they has a nice L-C meter that is cheap - $50 I think...
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Old 29th October 2007, 06:19 AM   #3
Nordic is offline Nordic  South Africa
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If its not too urgent, I plan to release an inductor-meter kit over the next month or so. Should be well south of $50. It also measures capacitance up to about 800nf when it hits the math limit of the PIC. Accuracy, +-1%
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Old 29th October 2007, 06:33 AM   #4
es44 is offline es44  Denmark
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Quote:
Originally posted by Nordic
If its not too urgent, I plan to release an inductor-meter kit over the next month or so. Should be well south of $50. It also measures capacitance up to about 800nf when it hits the math limit of the PIC. Accuracy, +-1%
Hi Nordic.

Looking forward to that kit. I guess a lot of people could use en LC-meter

Have a nice day
Ebbe
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Old 29th October 2007, 07:41 AM   #5
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Hi,

If the inductors are for crossovers, until you get your meter, this calculator is rather accurate I've found:

http://geek.scorpiorising.ca/calculator.html

Cheers!
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Old 29th October 2007, 01:11 PM   #6
es44 is offline es44  Denmark
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Thanks a lot Geek.
But it's also for unknown inductors. I'm messing a bit with HF/VHF equipment too, and sometimes it would be nice to know if one of the coils just laying around can be of any use.

Best regards
Ebbe
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Old 30th October 2007, 12:24 AM   #7
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Hi Ebbe,

Quote:
Originally posted by es44
... I'm messing a bit with HF/VHF equipment too, and sometimes it would be nice to know if one of the coils just laying around can be of any use.
For VHF inductors, I found a dip-meter with the unknown coil shunted by a known value cap to be most accurate. Even the most expensive digital L/C meters seen to tank in accuracy with values below 1uH or so.



Cheers!
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Old 30th October 2007, 12:41 AM   #8
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Geek's method is also fine for audio. Just use a meter and signal generator and resonate the inductor with a known cap, like a 1% silver mica.
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Old 30th October 2007, 03:30 AM   #9
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Hi Conrad,

Quote:
Originally posted by Conrad Hoffman
Geek's method is also fine for audio. Just use a meter and signal generator and resonate the inductor with a known cap, like a 1% silver mica.
You speak of the choke method on this page?
http://geek.scorpiorising.ca/windingchokes.html

Cheers!
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Old 30th October 2007, 11:49 AM   #10
Elvee is offline Elvee  Belgium
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Quote:
Originally posted by es44
Thanks a lot Geek.
But it's also for unknown inductors. I'm messing a bit with HF/VHF equipment too, and sometimes it would be nice to know if one of the coils just laying around can be of any use.

Best regards
Ebbe
You can find a simple multimeter inductance add-on here:
http://forums.futura-sciences.com/post1035173-2.html
It isn't very accurate, but it's simple and cheap, and is suitable for for VHF coils <1H.
LV
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