Re: solderig enamelled wire, problems.

Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

Liz Tuddenham <liz@poppyrecords.invalid.invalid> wrote:

<albert@spenarnc.xs4all.nl> wrote:
 

I remember soldering coil/transformer wire was simple in the 70's.
The trick was putting the wire an aspirin tablet and 0.1 mm was no
sweat.
 
Now for the 1v-5v step up converter I followed the advice, and remove
the winding of a 5x5 mm ferrite coil and replaced it with a bifilar
wire with the same number of turns. This was surprisingly easy.
.35 mm wire with 2*.25 wire. (The wire was stolen from a broken
ventilator.)
 
Now I get stuck. I can't solder the wire! The aspirine trick doesn't
work. Burning the insulation turn it into a black coating that
is equally tenacious. Making the copper redhot to burn the coal,
only make the copper to melt.
 
Groetjes Albert

 
 
Put some methylated spirits or ethanol in a small open metal container
such as the lid of a bottle .  Set fire to it and hold the end of the
wire in the flame until it is red hot.  Plunge it downwards into the
liquid and slide it out sideways so it doesn't get heated a second time.
 
There will be a chemical reaction between the oxide on the red hot
copper and the ethanol, which removes the oxide and leaves the wire
bright and clean.
 
Have a piece of metal ready to put over the container to extinguish the
flame and plan in advance how you will deal with the rapidly-spreading
fire if you upset the container.  Put the bottle of ethanol some
distance away.
 
 

 
Fun. I’ll try it outdoors sometime, but not at my bench!

When I worke at Eddystone Radio, that was the standard method of dealing
with Litz wire.  The meths pot was like an old fashoined whale-oil lamp
with a spout and it was mounted in an asbestos-lined steel box with a
hinged lid that could be flipped down in emergency.

The chief engineer also used it to light his cigarettes.


--
~ Liz Tuddenham ~
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