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Old 31st December 2001, 11:55 PM   #1
JoeBob is offline JoeBob  Canada
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Default mm to awg

I need 0.4mm wire, but what gauge would this be? Thanks.
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Old 1st January 2002, 12:40 AM   #2
blmn is offline blmn  Brazil
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I suppose it is the diameter isn't it?

If it is, the correct AWG number is (rounded) 27 (0,39mm). 26 AWG is a little bit larger (0,44mm).

regards
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Old 1st January 2002, 01:15 AM   #3
JoeBob is offline JoeBob  Canada
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I gathered it was the diameter, but the source didn't specify. I guess I'll get myself some 27 awg then, if not hopefully 26 will be close enough for my mini inductor...
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Old 1st January 2002, 01:25 AM   #4
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be careful there ... wire size can have a big bearing on inductors.
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Old 1st January 2002, 04:20 PM   #5
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AudioFreak's observation is correct, but I'd like to add that when you're using wire that small, the insulation (urethane, enamel, etc.) thickness will begin to be a non-trivial percentage of the thickness of the wire. You may need to fiddle a bit in order to fine tune the inductance. Their wire might have had thicker/thinner insulation than yours.
N.B. I am not saying not to wind you own. Far from it. Just be prepared to scrape a tiny bit of insulation from the wire and test when you're getting close to the stated number of windings. When done testing, paint the scrape with urethane, shellac, etc. (shellac dries very quickly--I've also known people to use fingernail polish, I'll leave the choice of color up to you). Keep notes on any differences in number of turns, etc. so that if you need to wind more inductors, you can turn them out as a production line item in the future.

Grey
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Old 1st January 2002, 06:47 PM   #6
JoeBob is offline JoeBob  Canada
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Well, actually it isn't a big inductor. It's 0.4mm wire wrapped 10 times around a 1 watt resistor. So fine tuning it shouldn't be too much trouble there, since it's so small.
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Old 1st January 2002, 07:18 PM   #7
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Sounds like a Zoebel...you'll be fine, then. Go for it.

Grey
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Old 3rd January 2002, 10:41 PM   #8
JoeBob is offline JoeBob  Canada
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Since it's a Zobel, does accuracy really matter? 10 turns of 27 gauge, but I can only find 24 gauge here... Would ten turns of 24 gauge do well enough? Or should I order some 27 gauge for the sole purpose of having a foot or two of it?
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Old 3rd January 2002, 11:01 PM   #9
blmn is offline blmn  Brazil
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JoeBob,

It's not a Zobel, but it doesn't matter. This value is not critical. You can use #24 without problems. It's a series inductor to avoid problems with capacitive loads/cabling capacitance at high frequencies.

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Old 3rd January 2002, 11:27 PM   #10
JoeBob is offline JoeBob  Canada
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Ah, thanks. Will do then.
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