Ok, so, if IR photo diodes are high impedance which won't work on the ADC, what is this that I have? It works and works really well. I tried some others that I found that look like diodes or diodes that are black and they work but no where near as well as this little black box on a voltage splitter. Does it contain a preamp? I found it at my local surplus store. They didn't have any specs.
pito:
Note the IR diode could be used 2 different modi.
What do you mean?
terryking228:
The other reason for using an amplifier is Speed. It can react primarily, and quickly to Current from the photodiode. Photodiodes can have very fast response. What do you need? If it's "slow" like 38KHz or lower, not much of a problem...
I noticed that this device looks like it takes about 400-500usec to respond to turning on a IR LED. Can it be made faster using a amp then?
I'll need to read up on impedance matching.
