<a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/schem.jpg"><img src="http://www.casperelectronics.com/images/finishedpieces/sequencers/_schem.jpg" width="300" height="300" alt="" title=""  /></a>
I decided to build a step sequencer for the circuit bending class I'm teaching. In my usual, unrealistically ambitious manner I decided I'd just "throw together" a 4 channel, 8 step unit with varying pulse length. <a href="http://www.sailormouth.org/index2.php?pg=mod_seq_proj.inc">Sailor Mouth</a> and <a href="http://www.cgs.synth.net/modules/gate_sequencer2.html">Ken Stone</a> both have a bunch of info on step sequencers on their sites. It probably would have saved me some frustration and headache  had I looked through their pages before starting. I'm too tired to explain how this works. Sailor mouth has lots of really helpful info on his site... I'm hoping that someone out there who already has some idea of what's going on will find this info useful or will have some suggestions.

Anyway, here is the schematic I've come up with so far. it's pretty rough and incomplete. There are a few non vital component values that I haven't identified yet, but over all, I think the design is sound. The main "innovation" in this design is that the pulse output of the 4017 and the 555 are fed into an AND gate to generate a 50% duty cycle pulse output. This allows you to get 8 trigger pulses from an 8 step sequence<br>Whithout the AND gate, it is only possible to get a max of 4 pulses from a 4017 set to an 8 step loop.
  