[sdiy] Wiring pencil

[nicolas]

For short connections I use plain copper wire, a single solid conductor, no insulation of any kind.  Fat enough and stiff enough to stay where I put it, so it wont sag down and touch anything its not meant to.  Less than 1cm it can be thin so I use spare resistor/diode leads, but for runs 1-4cm it needs to be heavier and stiffer, like 0.5mm or more.  I only use insulated wire for runs longer than 4cm or if it needs to be flexible multistrand stuff for some reason.  

Cheers,
Nicolas


--- On Sun, 13/7/08, Andre Majorel <aym-htnys at teaser.fr> wrote:

> From: Andre Majorel <aym-htnys at teaser.fr>
> Subject: [sdiy] Wiring pencil
> To: synth-diy at dropmix.xs4all.nl
> Received: Sunday, 13 July, 2008, 9:54 PM
> [Not specific to synth-DIY but I think this might interest
> other
> subscribers.]
> 
> My prototyping is normally done on single-sided vector
> board,
> using 0.05 mm² wire wrap wire (PTFE or PVDF insulation).
> On short
> connections (less than about 2 cm), stripping the wire is a
> pain.
> I'm thinking about trying a wiring pencil.
> 
> If I understand it correctly,
> 
> - the insulation is polyurethane enamel,
> 
> - you don't strip the wire, the heat of the iron
> vapourises the
>   enamel,
> 
> - you can (must ?) use little combs to order the wires.
> 
> Things that worry me :
> 
> - Do you have to use the combs ? They're for 1.02 mm
> holes and my
>   vector board stock has smaller holes (around 0.8 mm).
> 
> - Once you have soldered one end and "drawn" the
> wire to the other
>   end, what do you do ? You'd need three hands to hold
> the pencil,
>   the iron and the solder. Do you cut the wire to length
> and hope
>   it stays put ?
> 
> - The wire is awfully thin. 0.15 mm outer diameter
> including 0.012
>   mm thick insulation = 0.0125 mm² ! Couldn't that
> cause problems
>   for analogue synth-DIY ? The resistance is given at about
> 1 ohm/m
>   so the average connection will be a few tens milliohms.
> 
> Thanks for any hints !
> 
> -- 
> André Majorel <URL:http://www.teaser.fr/~amajorel/>
> Do not use this account for regular correspondence.
> See the URL above for contact information.
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