hot to wind a coil?
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- Banned
- Topic Starter
- 12368 posts since 30 Apr, 2002 from i might peeramid
if one is winding a coil, the first layer is easy. beginning, wind, end.
however, people often mention using multiple layers to increase the effect of a coil. what they omit is how this is accomplished.
given my appalling knowledge of electronics (it's not my fault really) i _assume_ that if you wind the second layer back over the first layer but in the opposite direction, you are reducing the field effect of the first layer. i also _assume_ this would be true if you ran the wire in a straight line back to the beginning and wound subsequent layers over it.. by crossing the direction of turning, aren't you screwing it up??
so.. i can only presume that the only effective way of actualising a multiple layer winding is to cut a separate length for each layer, solder them all at the beginning, wind them, then solder them all at the end, eg. creating 'nested coils in parallel,' which seems like a lot of work, ie. something people would mention if it were actually necessary.. soooo i am presuming my idea that winding a 2nd layer against the direction of the first must somehow be wrong.
i'd test it but i've had terrible luck with electronics so i end up reading it over and over because eg. my capacitor doesn't work so i can't actually make any practical observations..
tia,
however, people often mention using multiple layers to increase the effect of a coil. what they omit is how this is accomplished.
given my appalling knowledge of electronics (it's not my fault really) i _assume_ that if you wind the second layer back over the first layer but in the opposite direction, you are reducing the field effect of the first layer. i also _assume_ this would be true if you ran the wire in a straight line back to the beginning and wound subsequent layers over it.. by crossing the direction of turning, aren't you screwing it up??
so.. i can only presume that the only effective way of actualising a multiple layer winding is to cut a separate length for each layer, solder them all at the beginning, wind them, then solder them all at the end, eg. creating 'nested coils in parallel,' which seems like a lot of work, ie. something people would mention if it were actually necessary.. soooo i am presuming my idea that winding a 2nd layer against the direction of the first must somehow be wrong.
i'd test it but i've had terrible luck with electronics so i end up reading it over and over because eg. my capacitor doesn't work so i can't actually make any practical observations..
tia,
you come and go, you come and go. amitabha neither a follower nor a leader be tagore "where roads are made i lose my way" where there is certainty, consideration is absent.
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- KVRist
- 452 posts since 8 Jul, 2004
Nope; no U-turn of the wire, no change of direction for the magnetic field.xoxos wrote:i also _assume_ this would be true if you ran the wire in a straight line back to the beginning and wound subsequent layers over it.. by crossing the direction of turning, aren't you screwing it up??
So every industrial coil just is layer over layer, all wound the same direction.
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- KVRAF
- 4205 posts since 21 Oct, 2001 from my bolthole in the south pacific
Are you simply making a hand wound inductor or is it for a guitar pickup?
Layering is no problem. There were some copper coils used in high end hi-fi crossovers that used a thin copper sheet which spanned the full width of the coil. They were wound layer on layer like a roll of gaffer tape.
Layering is no problem. There were some copper coils used in high end hi-fi crossovers that used a thin copper sheet which spanned the full width of the coil. They were wound layer on layer like a roll of gaffer tape.
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- KVRAF
- 16977 posts since 23 Jun, 2010 from north of London ON
Hand coiled or machine coiled...just layer over layer..no turning back or U turning,,continue same direction as you were on first layer...
Some good information on coils and such...
http://www.mikroe.com/old/books/keu/03.htm
Some good information on coils and such...
http://www.mikroe.com/old/books/keu/03.htm
Barry
If a billion people believe a stupid thing it is still a stupid thing
If a billion people believe a stupid thing it is still a stupid thing
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- Banned
- Topic Starter
- 12368 posts since 30 Apr, 2002 from i might peeramid
i got this from another source.. the turns go in the same direction (clockwise/anti-) the wrapping doesn't need to (eg. from beginning to end) so once you get to the end you can continue wrapping in the other direction exactly as a spool of cotton is wound..
it's for a small emp gun to disarm rfids
it's for a small emp gun to disarm rfids
you come and go, you come and go. amitabha neither a follower nor a leader be tagore "where roads are made i lose my way" where there is certainty, consideration is absent.
- KVRAF
- 5537 posts since 5 Aug, 2006 from UK - The Mudway Towns
Hmmm. Are you intending to hit it with a fairly high amplitude pulses? If so wrap a thin sheet of tissue over each layer - leading the wire through the overlap. Provides extra insulation, and stops the layers getting mixed up - also gives you the chance to take a break from time to time
P.S.
As you are unlikely to have vacuum facilites, varnish the finished coil with shellac (French Polish). This, being very thin and light penetrates far better than conventional electrical varnishes.
P.P.S.
I'm one of the idiots who used to wind valve amplifier transformers by hand
P.S.
As you are unlikely to have vacuum facilites, varnish the finished coil with shellac (French Polish). This, being very thin and light penetrates far better than conventional electrical varnishes.
P.P.S.
I'm one of the idiots who used to wind valve amplifier transformers by hand
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- Banned
- Topic Starter
- 12368 posts since 30 Apr, 2002 from i might peeramid
i'm going to be using big wire for this.
you come and go, you come and go. amitabha neither a follower nor a leader be tagore "where roads are made i lose my way" where there is certainty, consideration is absent.