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'[EE]: 660mH inductor'
2002\09\20@091621 by Kieren Johnstone

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Hi,
I've been looking at guitar pedal designs, and all the wah circuits I've come across use a 660mH (or there abouts) inductor.  AFAIK this is quite a large value, my 2 weeks research haven't helped me find out how to build / buy one to this value.  I found a site telling me an opamp can be used, but I feel my calculations must be wrong (needing resistors in the gigaohm range etc!)... I would be extremely grateful if anyone could help me out here with a supplier URL or circuit! :)

Thanks,
Kieren Johnstone (typing left-handed with a double-broken right arm!)

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2002\09\20@093939 by cdb

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face
Well a quick google found that Renco in the US make chokes to 270mH.
If you want one ready made perhaps a Valve Radio society/advertiser
may have something after all valve radios often had chokes in the
henries range.

Alternatively it is not that difficult to wind your own (well a
broken arm might be a problem) using a toriod. What frequency or
reactance does it require?

If your dodgy on XL or N= here is a quick webpage for you
http://recording.org/users/kev/Inductors.htm

Colin
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cdb, spam_OUTbodgy1TakeThisOuTspamoptusnet.com.au on 20/09/2002

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2002\09\20@094952 by Rick C.

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Forget the chokes. All you need is a manually sweeping bandpass filter between 200hz and 5khz. An opamp will do the job. I've seen numerous schematics on the web but I haven't saved the links. Will look in my archives for them. I don't know why you want to reinvent the wheel when you can buy a new one for about US$35 with an average price of US$75..
www.doctormusic.net/product.asp?pid=198&sec=acc
The biggest problem in building your own is the mechanical portion unless you have a good sheet metal shop.
Rick

Kieren Johnstone wrote:

> Hi,
> I've been looking at guitar pedal designs, and all the wah circuits I've come across use a 660mH (or there abouts) inductor.  AFAIK this is quite a large value, my 2 weeks research haven't helped me find out how to build / buy one to this value.  I found a site telling me an opamp can be used, but I feel my calculations must be wrong (needing resistors in the gigaohm range etc!)... I would be extremely grateful if anyone could help me out here with a supplier URL or circuit! :)
>
> Thanks,
> Kieren Johnstone (typing left-handed with a double-broken right arm!)
>
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2002\09\20@141546 by Bob Blick

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If you need just one, how about using a small transformer. Perhaps either
the primary or secondary of a wall-wart will be what you need. Ignore the
unused winding. And of course remove any rectifiers.

I just moved my office and haven't been able to locate my henry-meter or
else I'd already have checked a few wall-warts for value in order to back
up this suggestion.

Cheerful regards,

Bob

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2002\09\20@171006 by Peter L. Peres

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look into mains trnsformer primaries.

Peter

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