Re: Quick & Dirty Current Shunt

On Sun, 29 Mar 2009 23:33:00 -0500, Tim Wescott wrote:

> Problem: I need to measure up to 30 amps (50 would be nice), I've spent
> my discretionary budget for the upcoming month, and all I have are 10A
> meters.
>
> What's a good quick & dirty current shunt? There's no dead heaters on
> site -- would it make sense to hack a bit of FR-4 to just the right
> length & width to develop 50mV at 50A (while dissipating 2.5W, of
> course)? Or should I find the right length of copper wire to do this?

I once made one out of a piece of brass shim stock from the hobby shop (RC
airplanes, model trains, that sort of thing.)

Or get an ordinary 0.01 ohm resistor:
http://search.digikey.com/scripts/Dk...=MR30.01FTR-ND ,
for example.

Have Fun!
Rich

Rich Grise wrote:
> Or get an ordinary 0.01 ohm resistor:...

30amps, .01R: 9 watts