I'm working on a small project which involves current measurement.
I'm using R10 to measure Voltage drop (100 mV) when 10 mA current goes through it.
Next I'm amplifing that signal around 37 times using an op-amp (LM358N) which is powered using 0-5 VDC and works as differential amplifier. There should be 3.73 V on the output BUT...
My problem is:
The op-amp is completely ignoring the inputs and it still outputs a value around VCC minus 1.2 V.
Making a symmetrical power supply does not help. I checked everything about 100 times and can't find any solution... If anybody of you know how to help me I'd be grateful.