[sdiy] Sequencer Idea

[John L Marshall]

I just bought 288 BCD thumbwheel switches for $20. I figure that I can build
a really big, easy to program, sequencer using the thumbwheel switches. Here
is the plan:

Build a 48 step sequencer using 48 thumbwheel switches. The thumbwheel
switches point to a 4x10 bank of pots. Four control voltages are available
but there will only be ten unique sets. My experience is that longer
sequences often repeat sounds. Ten unique sounds for a 48 step sequence
probably works.

1. Clock drives usual divider chain.
2.  Divider chain drives 3 each 74x159 (open collector) four line to 16 line
demultiplexer.
3. Each demux output connects to  it's own BCD thumbwheel switch.
4. The BCD lines are all tied together and routed to an open collector BCD
decoder.
5. The BCD decoder is connected to a 4x10 bank of pots.
6. The rest is the usual analog stuff.

 Comments?