tim1365:
Dear all,
I want to use arduino to read an output of photodector. But the output voltage is on the negative voltage range and depending of incident light is in the range from -100mV to -1V. How to convert the signal from negative to positive region, idealy via 1:1 invertor. I have read about inverting operational amplifier (op), and how a question about connection of op, photodetector and arduino. How do do such a connection and which op it is better to use?
What photodetector? Give links for all hardware please, we cannot even begin to guess these details!
Also what bandwidth are you looking for? (An LM358 for instance is totallt hopeless for anything high bandwidth,
but then again so is the Arduino ADC).
In case anyone's wondering, the LM358 won't even do audio bandwidth at full signal swing.