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Thanks for all this discussion. It looks like there are many things to consider - which I enjoy because each potential problem is an opportunity to learn about some aspect of electronics theory that I wouldn't have otherwise considered. For me, designing things is how I learn about them. I bought a turnkey solution so that I would have something that I know will work. But, I'd also like a design a system so I can understand how it works. I've followed the open source hardware movement for several years now and my ultimate goal with all of this is to see if one could produce a decent high resolution system with off the shelf parts. If I can get something working well with the PC, I'll move over to seeing what kind of resolution is possible with different commercial SiPIN diodes that are reverse biased.

I think the way to proceed with this preamp is to build a few of the commercial designs as reference parts and then start swapping in different opamps to see what kind of results can be obtained. The great things with the DIY approach is that the cost difference between different opamps is well within the experimenter's budget - something decent might cost $7 and then a much higher quality opamp might only be $15.?

I'll order to things on DigiKey and see what kinds of results I can get.?

Geo - I know you design a lot of things. I'm assuming that because of the capacitance issues, normal breadboarding is out of the question. For prototyping these kinds of circuits do you use through-hole perf boards or do you etch boards and use SMDs?

Again, thanks for the various leads for things to think about.

Best,
Soren