[sdiy] rotary encoder?

[Dave Kendall]

You're absolutely right.

I had forgotten that IC was a 4x4 matrix, rather than several switches 
shorting to GND.   *oops*

I got a load of them a while back and am trying to find a cool use for 
them, apart from the CGS10
http://www.cgs.synth.net/modules/cgs10_pedal.html

Just checking the data sheet for the fairchild MM74C922, there is a 
schematic for extending the number of switches to 32.
Could be interesting....


cheers,
Dave

On Jan 8, 2009, at 18:50, Ingo Debus wrote:

>
> Am 08.01.2009 um 19:23 schrieb Dave Kendall:
>
>> I wondered if a 74C922 might do the trick, along with a regular 12 
>> way 1 pole......
>
> But how? The 74C922 requires the switches arranged in a matrix, and a 
> 12 way 1 pole switch has one common contact for all 12 switches. 
> Perhaps a 12 way 2 pole rotary switch "back to back", with the two 
> common contacts connected, to emulate 12 individual switches?
>
> But using this IC would probably simplify the elektor circuit Florian 
> mentioned.
>
> Ingo
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