[sdiy] CMOS 4516+4067 questions

[Paul Maddox]

Grant,

> Have you considered using a voltage multiplexer? It is a bit odd to use a
> logic chip and then "hotwire" it for analog, when you have dedicated
analog
> chips like the CD4051 multiplexer. For instance generate a 10 volt supply
> with an op-amp. Then use two CD4051s to demultiplex (4051s are
> bidirectional) it to the top of each pot. You have already saved 16 51K
> resistors and have a more precise method. Plus you can adjust the range of
> the entire sequence by varying the reference (10 volt) voltage.

The 4067 is a MUX/DEMUX chip... thats what its sold as anyway, just 16
channels..
I agree about useing an opamp to supply the common rail on the demux chip
though.

I still think you could do with with a micro and a a couple of multichannel
DACs :-)

<ducks>

Paul
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