Seq2 Preview - PCB Project

[tomg]

I started work on the Sequencer 2 today. I had been thinking about the 74LS164
as a sequencer chip, I think I saw this in the Super Sequencer. Anyway the more I thought About It
the less I liked the idea of using TTL. So we are out walking, the wife says "you gota move to
live" so we walk about two miles a day, jog some mostly walk....and I'm thinking about this
sequencer and telling her what I want it to do and she's listening and it dawns on me the way I
need to go with this. 

Everybody wants 16 steps, nobody wants to give up any of the functions the seq1 has. So I decided
to use a 4516 for the sequencer chip. This has all the important pins plus the up/down count built
in, this is really neat!! It'll stop on a dime and go the other way! And that's good because I'm
going to have to add a flip flop to supply the carry out function to stop the seq2 thats running
and start the next one in the chain.

 The problem is it doesn't have sequential outputs, it has BCD outs. So I used 4051s to drive the
actual sequencer outputs. This worked out really well because using the inhibit pins on the 4051s
lets you split the 0-16 sequence in two parts 0-8 and 9-16. I will add (maybe) a 4017 to each half
that will allow you to set how many times (1-10) you wish each half to play before flipping back to
the other. This is a little redundant as the idea is to have one sequencer trigger another that
triggers another...that triggers the first one in the chain, and it starts all over again. But It
would be cool to be able to have two sequences in one... Maybe I should just add a counter to each
sequencer to determine how many times it plays before going to the next sequencer...Hummm we shall
see. Any Votes?

I think I prefer to use one sequencer per sequence and add a counter to determine how many times it
plays before starting the next module. What do you think is 1-10 enough?

Despite my efforts to avoid it I will have to add a 4066/16 switch to each glide pot and switch it
in/out with the channel output transistor to keep off channels from affecting the glide. This is
not shown. 

Comments? Suggestions? Wishes?

Do you want a small cheep board with a little wire-flying or a big expensive board with mounted
pots
and leds? This would require everybody buy the exact pots used to layout the board. I vote for the
cheep board myself.

http://www.mindspring.com/~vco/cbook/pics/seq2.gif

VCO4 UPDATE...

The Vco4 boards may be ready by Friday. They aren't dew until next Monday, but he said call. If
they are ready I should be able to ship as soon as Saturday.

-tg