4051/52/53/66 switching circuit question

madias · Joined: Dec 10, 2013 Posts: 3 Location: Vienna/Austria

Hello,
I´m working on a midi/cv controlled modular system and I´ve some questions about the circuit for cmos analog switches (4051-66).
For example:
I use the 8038VCO and wanna choose with a 4051 the waveform (sin, tri...). each waveform output is about 10VPP, 1K impendance, so my idea is:
CD4051: +-9V power rail and for each input 22K resistor (100k better?) and on the output side an inverting opamp with 22k (see picture)

So is this the correct way doing it (crosstalk, preventing to overload the switch)?

Thanks and greets
Matthias

switch-opamp.PNG

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