[sdiy] OT - DIY mixer

[Grant Richter]

> I am also considering building my own custom mixer.  Yeah, it may
> cost more, but you can make exactly what you want.  But I don't really
> have any specific suggestions.  Sounds like for what you are planing, IC
> opamps might be best...just have to pick one that will fit the bill.
> 

Hi Jim,

Have a look at them LM837 quad op-amp. Amazingly, Digi-Key has a good price
on them.

Using a 24 bit converter in to Spectra-Lab software, the LM837 has
unmeasurable noise floor relative to -10 dBv. That is the 24 bit A/D
converter is more noisy then the op-amp (M-Audio Delta 66).

Second harmonic distortion is around 0.01% or -80 dBv relative to the
fundamental.