CMOS multiplexer as input source switch

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Yes you can. I've used the DG211 / 212 with good results into a virtual earth input (inverting input of an opamp). There was some argument on the forum a couple of years back, whether the series resistor should be before or after the switch. I favour it before the switch (close to the input).
However, IMO nothing beats a good mechanical switch or relay!
 
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