[sdiy] Blackmer VCA cell

[Brian Willoughby]

On Oct 23, 2021, at 15:50, Mike Bryant wrote:
> A standard comparator based PWM circuit fed from one voltage drives a MOSFET switch fed with the other voltage and that feeds the averaging filter.   Just one FET more than a normal PWM.

That makes sense. So, an op-amp (comparator) plus a FET per PWM channel?

How difficult is it to select a capacitor for that averaging filter that will work well across the full range of both CV inputs? ... or does the frequency of the PWM determine the capacitance and that's it?

Brian