Source for output air cor output inductor?? - diyAudio
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Old 17th January 2004, 06:53 AM   #1
sam9 is offline sam9  United States
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Default Source for output air cor output inductor??

I've been winding my out ouput inductors. 16AWG, 1-2uH. While this isn't especially difficult, my "craftmanship" isn't the best looking. Search as I might, I cannot find an "off-the-shelf" source. (If I wanted to order 100-1000, that might be another situation!)

Is anyone aware of a source for ready made output inductors? Must be air core and 18-14AWG, 1-2uH.
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Old 17th January 2004, 07:30 AM   #2
sreten is offline sreten  United Kingdom
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I've never seen them "off the shelf" as they are so easy to make.
For best results use a coil former - anything will do - remove from
the former and then dip in wax or wood glue to hold the coil together.

sreten.
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Old 17th January 2004, 06:01 PM   #3
sam9 is offline sam9  United States
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Yup. Pretty much what I've been doing. I've also just discovered that using the theads on a bold of the appropriat diameter and thread-pitch is helpful. Too bad some clever soul doesn't make a 10-ohm resistors specially dimentioned to use as a form. I've made this work on low powered amps, but on higher powered it doesn't work out.
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Old 17th January 2004, 06:06 PM   #4
Magura is offline Magura  Denmark
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I produce air core inductors to pretty much any specifications. Max 100 mH though.

Send me a mail if interested.


Cheers

Magura
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Old 17th January 2004, 06:20 PM   #5
Steven is offline Steven  Netherlands
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Well, it is not air core, but Reichelt sells Fastron inductors per piece. I think these will do with 3.9uH, 12A.

Steven
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Old 17th January 2004, 11:25 PM   #6
sam9 is offline sam9  United States
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Steven,

Thanks. It should require a bigger amp than I'm building at present to saturate that.
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Old 19th January 2004, 01:56 AM   #7
djk is offline djk
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The low values required for an audio amplifier can be wound on a 2W resistor, any value. The Q damping resistor is added in parallel.
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Old 19th January 2004, 02:25 AM   #8
sam9 is offline sam9  United States
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"The low values required for an audio amplifier can be wound on a 2W resistor, any value. "

Well, that's true up to a point. But if I'm anticipating a 100W-150W @ 8 ohm that also can handle a 4 ohm load, I prefer using 16AWG magnet wire. My Wheeler's formula calculator tells me I need a larger diameter and/or length than any 2W resistor I know of has. 18AWG would do it but could get a bit hottter than I care for. I tend to be convervative about wire guage, heatsinks and thermal maters, generally.
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