Icantthinkofaname said:
How's the longevity of a build like that? I've heard varying opinions.
Well, the oldest of my own mics built like that is now around 3 years old ... and shows no sign of any deterioration.
As you can see from the photos and description, the IG resistor is fitted directly to the FET gate on the top side of the board, so the extreme HiZ parts are kept away from the stripboard tracks.
The flux from the soldering of the remaining components was removed with a sharp tip, and the whole board cleaned with isopropol alcohol.
As I say, so far so good ..... I've several mics built like it - some with K67 type capsules, some with K47.
I even tried one with a 3 micron edge terminated capsule, but I needed to reduce the polarisation voltage to stop the capsule collapsing.
Simple task -- I just removed one multiplier capacitor !
It's also very simple to vary the design with stripboard if you fancy experimenting
Obviously not a suitable technique for mass production -- but for a simple hobby project??
I've been very pleased with the results so far...