Joe, Steve,
     Thank-you for the suggestions. This is what I am looking for. Right=20
now I am experimenting with a CD4066. I don't have any 4051s right now=20
but the 4066s are helping me to design a control system.
rich!

On 5/21/2014 8:45 PM, IVP wrote:
> PS,
>
> to use a 4051-type IC with a rotary switch I'd look at using the
> ADC of a micro to control S0, S1, S2 and chip enable(s)
>
> I've not done this with a switch but have with a detented pot
>
> So for, eg, a 12-way 1-pole rotary, the 10 innermost terminals
> have a resistor such that its selection forms part of a divider to
> give a distinct and discrete voltage for the ADC. Positions 1 and
> 12 can be Vss and Vcc respectively
>
> As each IC is only a 1-of-8, use the micro to select any of a
> group of ICs for as big a bank of switches as you need
>
> Some old projects of mine (pre-ADC PICs)
>
> http://home.clear.net.nz/pages/joecolquitt/0pots.html
>
> http://home.clear.net.nz/pages/joecolquitt/mixer.html
>
> Joe
>

--=20
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