[sdiy] Waveform/source mixers in classic polysynths

[mark verbos]

> On Oct 6, 2017, at 7:01 AM, Michael E Caloroso <mec.forumreader at gmail.com> wrote:
> 
> On the old Oberheims in the voice card summing circuit, the log
> conversion is done by the common base transistor feeding the iABC pin
> of the OTA.  The common base configuration also happens to have a high
> output impedance which is precisely what a current source is.


Isn’t that a linear current source?

Mark