I have an idea for a project where I use a pc fan to make an oscillator. The oscillation is created by the cycle of light/dark falling on a light sensor as the blades of the fan rotate.
My initial research points to the use of the photodiode in combination with a op-amp to provide a suitable line audio output. My question is: What are the critical parameters for the circuit?
Here is the datasheet for the photodiode i'm prototyping: http://www.jaycar.co.nz/products_uploaded/ZD1948.pdf