Ah...??? Well, I vaguely remember having less wire left over for T2 than expected, and think I had to unwind some of the twistings, just to end up with enough length to poke thru the holes during the mounting. It didn't turn out as neat as I would have liked...?? Do you think it would be possible to wind too tight/too many twists? (WTST style?)
Or is it better to aim at the suggested 60 or so twists,? but just focus on even and consistent over the length?
On the part tolerances...? do you mean the 33nF's (C39-43?),? or do you mean the parts around the op-amp ADC front end??
I think I can imagine (pun there, see it?) some kind of test to take values and cancel out the differences, for a really balanced detector.
Awesome!
