[sdiy] Coolaudio VCAs: V2162 noisier than V2164?

[Mattias Rickardsson]

Hi there VCA lovers,

I've done some measurements of SNR & THD of the 2164 and 2162 VCA ICs
from Coolaudio, and I'm very surprised with the noise results I'm
getting. With the 2162 I cannot reach a SNR over 95 dB before
clipping, at any gain. With the 2164 at gain=1 I reach 120 dB SNR.
That's a huge difference!

When trimmed properly the 2162 does have slightly better THD, but the
noise seems to always be there in the background. I hope my
measurements are correct... the "-97 dBV" noise spec in the V2164
datasheet seems a bit odd to me compared to the "-94 dBu" in the V2164
dataheet - or I've misunderstood them.

Has anyone else tried the 2162 (either from THAT or from Coolaudio)
and compared it to the 2164 or other VCAs?

/mr