[Laser] Preamp design and other related stuff

[steve kavanagh]

I decided to try something like KA7OEI's version 3 front end, but simplified to the bare bones (so I would actually get it built !).  No bias on the photodiode, a simple AC-coupled JFET/bipolar cascode amp, and no bias on the JFET (well, self biased through the gate leakage current, with an AC coupled photodiode, so the drain current is just a bit more than Idss).  

Schematic is at

http://www.qsl.net/ve3sma/OpticalRx2011PreampSchematic.jpg

It seems to basically work, but there are so many other changes in my new receiver compared to the old one it is difficult to say how well, so far.

Any comments ?

73,
Steve VE3SMA