Vocoder design

[jorgen.bergfors at idg.se]

>> I guess that you are going to connect all OTA outputs together and buffer that. Right? I suppose that will work with current outputs like those on the 3080.

>Yes, I'll be summing the output currents of the OTA's in an output stage which I didn't show.

Come to think of it, what controls should the vocoder have? If you want a level knob for each band, this approach might not be ideal.

>I'm not familiar with the NE5517 - is that a single OTA with linearizing diodes?

It's virtually identical to the 13600, which is slowly getting rare.

/Jorgen