Re: [TCML] Turn-to-Turn short circuit

["Christoph Bohr" <cb@xxxxxxxxxxxxxxx>]

Hello Matthew

I did not try to point out any stupidity, it is somewhat normal that
people ( including me ) don't see the obvious when you are too close to
the problem.
You say, you knotted the wire inside the coil. Probalby not a real
problem with these coils, but generally not advisable.
The cleaner version would be to use a piece of cotton ribbon and
fix it under the winding to hold the ends of the wire. This is common
practice in transformer winding, or at least was before the fancy
plastic bobbins became common.
I'd love to show you a pic of the process, but I currently dont have
one at hand...

best regards

Christoph Bohr


> The overlapping turn was at the BEGINNING of the coil, I had knotted the
> wire inside the pen, and could not untie it. I'm not *that* stupid ; )
> But seriously, thanks for the tip.
>
> On Thu, Mar 19, 2009 at 1:51 PM, Christoph Bohr <cb@xxxxxxxxxxxxxxx>
> wrote:
>
>> Hello Matthew.
>>
>> I followed this thread ober the last days, here are my 2 cents:
>>
>> 1.: the wire looks to me, like the stuff you use around the garden or
>> for flowers and the like.... correct me if I'm wrong. If the green
>> coating
>> is just dark green and not very thick its probably the stuff I am
>> talking
>> about.
>> Geen enamel wire is usually pretty shiny and sort of a transparent green
>> which
>> should be relatively resistant to scrathing...
>>
>> 2.: As the overlapping turns are at the very end, it would have probable
>> been
>> less work to correct the problem than to type the posting ;-) ... sorry,
>> so
>> offense
>> intended...
>>
>> 3.: If you are using the coils is some sort of protection device for an
>> NST
>> or
>> similar,
>> the now common practice would be to use large resistors.
>> Theoretically chokes might be the better component to give you a LC over
>> a
>> RC
>> network, if you know very well what you are doing. If not, they might
>> induce more
>> problems than they solve. Again, as others said and apart from all the
>> nice
>> LC filter
>> math,
>> if the device is physically to small to withstand the whole expected
>> voltage across
>> it in
>> the case of failure it was designed for, it will be useless.....
>>
>> 4.: Yes, it might be better to use different wire. Documented is nice,
>> but
>> at least
>> something you rougly know what it can do or was designed for.
>> ebay or local motor shop for new stuff of even unwinding transformers
>> for
>> smaller
>> amounts on a low budget...
>> Otoh ... normal insulated wire works just as well for your purpose I
>> believe....
>>
>> Good luck in building whatever you are building ...
>>
>> regards
>>
>> Christoph Bohr
>>
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