2 waveform controlled switches-how could I make these work?

[gez]

I’ve been messing around some more with pulse width modulating 4016 switches and have managed to extend the range where voltage to resistance is fairly linear.

I shan’t be proceeding with this method though.  I was attracted to the idea in the first place because I thought it would have better linearity than FETs and less distortion - ICs of matched MOSFETs tend to have low distortion thresholds and 75mV peak-to-peak tends to be the max amount of signal the chips I use can handle, which isn’t too good.  However, the parts count to do the PWM technique is getting ridiculous and, considering the limited range (between 10k  - 100k at most), it would be a lot simpler to just clock a few digital potentiometers.  Damn site lower parts count and hang the expense!

I might consider this method for an Envelope-follower where linearity isn’t critical, but definitely not in a LFO driven circuit (not unless I wanted  to exploit the non-linear nature of a simple PWM circuit).

I’ll stick to attenuating the signal at the input and boosting it later down the line.  Come back my precious 4007s…all is forgiven!