I'm trying to upgrade an existing 0.1 ohm current sense as at 9A the 0.1ohm dissipates 8 watts. An LM358 at 10x handles the signal.
Current range is about 0.5 to 9A. Thus with the 0.01 ohm, 5mV to 90mV difference. Desired output either 10x (to feed into existing LM358) or 100x.
I was considering a current shunt monitor:
**broken link removed**
But I notice it has been spec'd from 20mV to 100mV and has a 2mV input offset. 2mV isn't much better than the LM358.
So I'm asking for suggestions on the approach.
I have access to the following opamps.
LM358, TL072/82, MCP6L72T, MCP6001,TLE2022, TLE2082,TLC2272, MC33072, OPA2134, OP07, NE5532, LT1013