Hi I'm looking for scheme of current to voltage converter that convert current 0-100µA to 0 to 5V. I tried with OpAmp, but it didn't work, maybe I made something wrong.
Put your OPamp in transimpedance amplifier mode, i.e., the current will see the input terminals and there is a resistance on the feedback which will give you a V = I*R
Well, if you maintain the the opamp in its bias conditions, it should not be a problem at all. Your current source hence should also have good output impedance.
Thanks. I actually build a ammeter to my application(not this on upper picture) that will show value on 10 LED by Lm3914. So I need this converter.
If I need range 0-100µA I what OpAmp conditions mast be done?
I add part of my application scheme
1-original version
2-what i'm going to do
Will it work?
I don't think it will, since your input is always with respect to ground and the circuit needs a "floating" meter.
I suggest you use a resistor instead of the meter (that will enable the orifginal circuit to works as it was intended) and build a differentiaal amplifier with one or-two opamps and measure the voltage across that resistor.