<a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/IMG_0565.JPG"><img src="http://www.casperelectronics.com/images/finishedpieces/sequencers/_IMG_0565.JPG" width="400" height="300" alt="" title=""  /><a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/IMG_0567.JPG"><img src="http://www.casperelectronics.com/images/finishedpieces/sequencers/_IMG_0567.JPG" width="400" height="300" alt="" title=""  /></a></a>This project is similar to the <a href="http://www.casperelectronics.com/finished-pieces/sequencers/">cam shaft sequencer</a> minus all of the moving parts.<br>
I'm still working on getting all of the <a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/switchScheme.jpg">circuitry</a> right. <br>There's a sample at the bottom of the page that I made using the sequencer to control a <a href="http://www.casperelectronics.com/finished-pieces/casper-sk-1/">casio SK1</a>,an analog bass drum synth and an analog noise synth. <br>
There's also a casper built <a href="http://www.casperelectronics.com/images/finishedpieces/echo/S3600062.JPG">echo</a> circuit in there.<br>
Here are some pictures of the first prototype.
<a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/S3600028_1.JPG"><img src="http://www.casperelectronics.com/images/finishedpieces/sequencers/_S3600028_1.JPG" width="400" height="300" alt="" title=""  /></a>

The sequencer is made up of four rows of 10 switches.<br>
There are four different sequences that can be programmed using the switches in that row.
The left most column is an on/off switch for each row. The right column switches between "short" and "long" mode for each row. In "short" mode, the sequencer creates one 50% duty cycle pulse per step. In "long" mode the sequencer outputs a 100% duty cycle pulse per step. So it will string two or more pulses next to each other into one long pulse the image below should clarify.
</p>
Here is the most current schematic as of December 7 2011. Click the image below to enlarge. 

<a href="http://casperelectronics.com/wp-content/uploads/casper/Sequencer-schematic.jpg"><img src="http://casperelectronics.com/wp-content/uploads/casper/Sequencer-schematic-767x1024.jpg" alt="" title="Programmable step sequencer" width="400" height="570" class="alignnone size-medium wp-image-793" /></a>
The schematic above is a substantial improvement over the other schematics below which I used in the past. I'm leaving them up for those out there who have used them and need them for reference. Other than that I strongly advise that you use the schematic above. It may be overly complex for your application but I tried to compartmentalize the schematic into its discreet parts so that it can be remixed as needed. </p>


.<a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/switchScheme.jpg"><img src="http://www.casperelectronics.com/images/finishedpieces/sequencers/_switchScheme.jpg" width="300" height="214" alt="" title=""  /></a><p>
<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>
<a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/S3600031_1.JPG"><img src="http://www.casperelectronics.com/images/finishedpieces/sequencers/_S3600031_1.JPG" width="400" height="300" alt="" title=""  /></a><a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/IMG_0567.JPG"><img src="http://www.casperelectronics.com/images/finishedpieces/sequencers/_IMG_0567.JPG" width="400" height="300" alt="" title=""  /></a>
<a href="http://www.casperelectronics.com/images/finishedpieces/sequencers/S3600027_1.JPG"><img src="http://www.casperelectronics.com/images/finishedpieces/sequencers/_S3600027_1.JPG" width="400" height="300" alt="" title=""  /></a><p><hr/>
Here's an awesome schematic of a programmable, rhythmic mixer sent in by <a href="http://feastrecordings.com">SUBBS</a>. Click the the image below to see a larger version.<p>
<a href="http://casperelectronics.com/images/finishedpieces/sequencers/CasperSQ%20Mod%20N.jpg"><img src="http://casperelectronics.com/images/finishedpieces/sequencers/_CasperSQ%20Mod%20N.jpg" width="412" height="500" alt="" title=""  /></a><hr/>