[sdiy] Sequencer with Selectable Number of Stages - schematic?

[John Mahoney]

At 01:22 PM 10/9/2007, DAF wrote:

>Hello - I am looking for info on making a sequencer with a 
>selectable number of stages.  I was thinking something based on 
>cascaded 4017's.  I have the app note from ON Semi showing how to 
>cascade 4017's for more stages using AND gates, but how would I go 
>about selecting anything from, say, 2 to 30 stages, assuming 
>cascaded 4017's?  Is it as simple as taking the reset pin of the 
>first 4017 and connecting it to whatever stage you want to be the 
>last, or do you have to connect it to the one after that?

No, it's not quite as simple as that. From what you are describing it 
sounds like the cascaded unit will be clocked only once every per 
loop (8 or 10 steps or whatever) of the other unit. There's musical 
value in doing that sort of thing, but I think that you want to run 
multiple units in series.

Check out Ken Stone's CGS07. Go to http://www.cgs.synth.net/, click 
the "PCBs for sale" link and then the CGS07 link. He discusses how to 
cascade multiple boards, which is what you want to do.
--
john 


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