[sdiy] Sequencer Interface connectors

[Ken Stone]

Take a look at my gate sequencer. It can be strung in series, run in
parallel etc.

Ken


>So I'm thinking I wanted to throw together a cheap, simple little 8 step
>analog sequencer. Then I'm thinking, what if I wanted to make another one at
>a later date and hook the two together. I haven't really found anything that
>would provide a means to easily daisy chain two (or more) sequencers. So
>here's what I think you would need to do this:
>
>*****************
>A "Clock In" jack for a clock signal from upstream
>A "Sequence End" jack for a end signal from upstream
>
>A "Clock Out" jack for sending clock out to downstream
>A "Sequence End" jack for sending end signal out to downstream
>
>A mode switch that would allow selecting Serial, Parallel, or Independent
>operation of each sequencer.
>*******************
>
>The Parallel and Independent modes would be easy. The serial mode is a
>little trickier, but not impossible. Basically, at start up all sequencers
>in the chain would be stopped and their outputs disabled (this is really
>what makes the serial mode work). The CV outputs are summed together to
>drive a single VCO, for example. Pressing START on Sequencer 1 enables its
>output and starts it counting. Sequencer 1 would provide the clock signal
>for the other sequencers when they are enabled. When Seq 1 reaches the end
>of its sequence, it stops counting, disables its CV output (so that it
>doesn't add to the CV and transpose the sequence), and sends a "Sequence
>End" signal out to the downstream machine. When Sequencer 2 sees this
>signal, it enables its output and starts stepping to the clock signal
>applied at the "Clock In" jack. Sequencer 2 could use its own internal clock
>if you wanted it to (just don't plug anything into the "Clock In" jack). The
>same actions would repeat if you have three, four, or however many
>sequencers daisy-chained together. At the last sequencer in the chain, you
>run the "Sequence End" signal from the output jack back to the "Sequence
>End" input on the first sequencer so that the whole thing will keep running.
>
>If you did the logic right, you could just hook up three or four sequencers
>and then quickly switch between parallel and serial combinations by just
>using the mode switch.
>
>I was also thinking of adding a "Transpose" mode. In this one, Sequencer 1
>would run through its sequence, and Sequencer 2 would be advanced to the
>next step by the "Sequence End" signal from upstream (Seq 2 would not use
>the Clock signal). Both sequencers have their outputs enabled and are
>basically running in parallel. If you summed the CV outputs together, then
>Sequencer 2 would transpose the output of Sequencer 1. You could also use
>the CV from Sequencer 1 to drive a VCO and the output of Sequencer 2 to
>drive a VCF. Then the output of Sequencer 2 could be set to act like an LFO
>synchronized to Sequence 1. 
>
>Any thoughts? Has this already been done? It seems very handy, and I would
>think it's been done before. I await your comments, criticism and collective
>wisdom. 
>
>
>Tim Servo
>"Imagination is more important than knowledge." - Albert Einstein
>
>
>
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_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au  
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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