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Unread 07-01-2002, 08:53
bigqueue bigqueue is offline
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Lightbulb

Someone noted that you can measure the voltage drop across a measure of wire. Yes, you would have to probably make that wire long to get a high enough resistance to measure.....but it is possible.

Now, why not just add a very small resistor in series....because it does not seem to be allowed. The rules say that the high impendence inputs of a circut may be attached to some number of points described, but it clearly indictates that this is OK because it does onto affect the circuit appreciatbly.

Placing a series resistor violates all the rules regarding how one MUST wire all the motors/spikes and other controllers......so it would be against the rules.

Still, the job is not as hard as it seems.....and with an op-amp or two (depeending on whether you need to build a true DIFFERENTIAL AMPLIFIER or if you can get a good common ground reference point).

There are of course other ways to do such a measurement using the magnetic radiation off the wire as current flows. I think this might be the better, more noise-free way to skin this cat.


-Quentin
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