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Re: E55 Ferrite transformer and Litz wire

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"Winfield Hill" <hill@rowland.harvard.edu> wrote in message 
news:o73ai1012r6@drn.newsguy.com...
> I often use large-diameter litz with hundreds of tiny
> wires.  I follow my technician's approach, which is to
> use a solder pot.  I dip the litz bundle into a gross-
> looking paste flux and then into the pot.  Voila, an
> instant ready-to-go solder-encrusted termination.

"Large"?  That's cute. ;-)

In the induction heating business, inch-wide rope is regularly used.  The 
ends are crimped into several-aught size lugs, some rosin dripped in, then 
dipped whole into a solder pot.  When the bubbling subsides, it's ready.

On a less bragging matter:

I've made litz myself, using whatever stuff I have laying around.  On 
several occasions, I've made the mistake of using this old brown stuff 
that's classic "enamel".  It just carbonizes harder and harder, on heating!

So I get out an abused teablepoon, and melt a lump of potassium chlorate(!) 
in it.  Heat the wire briefly in the flame, then dip the wire in the salt: 
FOOF, no more enamel!  Water quenches and dissolves the salt stuck in the 
wire, leaving perfectly clean, pink copper, ready to be tinned!

(!) Potassium chlorate is the schizophrenic little brother of potassium 
perchlorate, which itself is basically used in pyrotechnics and not much 
else.  Perchlorate is remarkably stable, as long as you don't drip 
concentrated sulfuric acid on it, or heat it over 600C.  Chlorate is a much 
weaker salt, and becomes a friction-sensitive explosive if paired with 
mildly acidic fuels like sulfur or phosphorus.  It's still stable enough to 
melt, but it's bubbling with oxygen all the while...

Tim

-- 
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: http://seventransistorlabs.com 

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Re: E55 Ferrite transformer and Litz wire albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-02-03 19:54 +0100
  Re: E55 Ferrite transformer and Litz wire jrwalliker@gmail.com - 2017-02-03 15:06 -0800
    Re: E55 Ferrite transformer and Litz wire Winfield Hill <hill@rowland.harvard.edu> - 2017-02-03 17:25 -0800
      Re: E55 Ferrite transformer and Litz wire "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-04 08:47 -0600
        Re: E55 Ferrite transformer and Litz wire Chris Jones <lugnut808@spam.yahoo.com> - 2017-02-06 23:43 +1100
          Re: E55 Ferrite transformer and Litz wire "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-06 08:17 -0600
          Re: E55 Ferrite transformer and Litz wire Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-02-06 20:11 +0200
  Re: E55 Ferrite transformer and Litz wire Okkim Atnarivik <mikkivir@gmail.com> - 2017-02-06 06:12 -0800

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