I am looking for applicatin notes for circiuts used to detect light modulation frequency for AC Light sources. These would be low frequency sources such as 60Hz lighting etc... (0-500Hz in general). The basic approach would be to use a photodiode in photovoltaic mode to detect the light and amplify the signal.
The key is to come up with a relatively simple single supply circuit that will have a very wide dynamic range (from very low light levels 1Fl and up) and be stable over a 0-500Hz (or higher).
This requires removing the DC component and amplifying the AC comoponent ultimatly producing a logic level pulse train at the light modulation frequency.
The goal is for everything to run off a single 3.3V supply.
The key is to come up with a relatively simple single supply circuit that will have a very wide dynamic range (from very low light levels 1Fl and up) and be stable over a 0-500Hz (or higher).
This requires removing the DC component and amplifying the AC comoponent ultimatly producing a logic level pulse train at the light modulation frequency.
The goal is for everything to run off a single 3.3V supply.
