Hi,

On 15 Mar 99 at 8:34, Jim Dolson wrote:
> Is there an easy way to measure currents in the range of 1A-7A.  The
> circuit in question is for part of a constant-current battery charger.
> Accuracy and precision isn't too important - measurements to 1/10 of an
> amp are sufficient.

You could try a linear Hall-effect sensor, I don't remember a part
number off my head but I believe I saw something in the Digikey
catalog.  Basically you need some core shaped like a C, you
insert the sensor in the "hole" in the C and wrap your conductor
around the core a few turns (more turns = higher voltage).
The sensor I've used required 5V and GND and produced an analog
output proportional to the current (2.5V = 0 amp).

Hope this helps,
Guy - mlsirton@inter.net.il