[sdiy] The TL072 , part 2

[Colin f]

> I tend to use MXL1013/LT1013 for precision CV summers.

Linear make some nice parts.
I've been using LT1112 in a board for driving linear VCOs, and I got better
tuning accuracy than the original control board, with no need to do any
offset nulling at all.
60uV offset on those...
The bandwidth is low, but that's probably a good thing - stops any chance of
spurious MHz FM appearing.

Cheers,
Colin f