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| Labrat101:
Though sheer boredom I was was looking for a Shunt resistor . So going though years of stock piled parts etc . I needed a 0.05 \$\Omega\$ @ 50 amp . So not finding anything that was suitable . I went into.. How hard can it be to make it :palm: Copper wire ... No Steel wire .. Hum has a high resistance but very unstable with temperature another No. Putting my soldering Iron on the cleaning wire .. Brain wave . low frequency . Those stainless steel pads we use to clean our soldering iron tips . are 410 Stainless steel 11.5% nickel chrome :-+ Yes . looking Good . measured it 18mm is showing 1.1030 \$\Omega\$ . Also taking a piece about 15cm long powering it from my lab power with 5v @ 1amp it become a very handy foam cutter . These steel cleaning pads Have many uses . Maybe not the best . So just rapping this wire round a couple of copper posts , A few times I was able to get my 0.05 \$\Omega\$ for testing an quick repair of my electronic load . :-+ These wire cleaning pads have a melting point of about 1500 C Resistance aprox 0.5 \$\Omega\$ per cm I guess they aint Quality controlled so there will be different specs . I'm sure there are many other DIY thing that can be made from reusing this stuff Have Fun and don't burn your fingers . More Ideas welcome |
| jonpaul:
Use only Nichrome wire, for heaters and high temp. Crimp do not solder. Shunts need a low TC, various resistance wire are available. Steel wool will burn. Jon |
| Kleinstein:
The stainless steel pad is a bid thin for a high current shunt. Otherwise the usual stainless steel is reasonable low TC for a material not specially made for that. The problem is only the soldering, which is hard and needs special flux. |
| Zero999:
Does it copper plate easily? If so, perhaps that'll make soldering easier. 50A through 50mΩ is 125W. How did you stop it vaporizing? |
| Labrat101:
--- Quote from: jonpaul on January 14, 2022, 11:58:10 am ---Use only Nichrome wire, for heaters and high temp. Crimp do not solder. Shunts need a low TC, various resistance wire are available. Steel wool will burn. Jon --- End quote --- I know steel wool burn . This is Not the steel wool stuff . its 1mm x 0.05 mm spring wire it seem to handle about 6 amps without a problem . the one I have is very tight spring wound . and cheep . as far a I can tell from running a few tests it has a high content of chrome . It was more of a Fun thing . I did also find some 3kw Nichrome wire afterwards and Yes its better . |
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