[Boatanchors] Milliammeter shunt resistance wire sources?

[Carl]

It is quite solderable with minimal effort.

First sand the area to be tinned. Then use a dilute hydrochloric acid also 
found as muriatic acid, stainless steel or plumbers liqiud soldering flux, 
and a few other names. Apply the flux and follow with a hot iron or gun. 
Wear eye protection.

OTOH, it may be rather hard to get a fractional Ohm tolerance needed for 
accuracy. If current is low for the wire size the copper wire works well.

Carl
KM1H


----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Greg Mijal" <bluebirdtele at embarqmail.com>
Cc: <boatanchors at mailman.qth.net>
Sent: Friday, May 28, 2010 12:30 PM
Subject: Re: [Boatanchors] Milliammeter shunt resistance wire sources?


>A definite maybe. If the toaster has been used, the surface of the wire is
> likely badly oxidized and all but impossible to solder.
>
> An old time hardware store (Not Home Depot) might still have either the
> replacement coils for the open face hotplates or the conical screw-in
> space heater replacements that screw in like light bulbs, somewhere on a
> back shelf.
>
> If you do find some NiChrome wire, you'll need acid core solder to tin it.
>
> I's suggest looking ar Digi-Key or Mouser for low Ohm, wirewound
> resistors. 1 Ohm are certainly made. I'd look for about 0.05 Ohm, maybe by
> paralleling several.
>
> FWIW,
>
> -John
>
> ==================
>
>
>> Hi:
>>
>> Is an electric toaster a good source of shunt wire for a meter scale
>> changing project?  Is the wire solderable?
>> I'm going from 0 - 1 ma to 0 - 1 A in scale.
>> Tnx
>> Greg
>> WA7LYO
>> Kinston NC
>
>
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