Friday, January 17, 2014

16-Step Sequencer

This is the first prototype of my 16-step sequencer. I don't know how long I've been working on this, seems like more than a year. Stuff kept coming up and I would have to put it aside for one reason or another. Although having a few bugs with the PCB that I had to resolve, it's now a complete and working prototype, finally.



Features
  • Three position switch for each step: On/Off/Tie
  • Range Switch: 2-5 octave 
  • Step knob: Dial in steps between 2-16
  • *Various step-directions: Fwd / Bck / Ping-Pong1 / Ping-Pong2 / Random
  • Internal clock with pulse width knob
  • Hold and Reset buttons
  • Portamento
  • Quantizer On/Off switch with scale selector
         Major
         Minor
         Pentatonic
         Whole Step
         Chromatic
  • CV Out, Reset, Gate out, Clock In, Clock Out, Transpose In, Hold

    Now, I'm trying something new that I haven't seen in other sequencers. It started out as a visual aesthetic that I wanted to add to the sequence direction but it turns out to be really useful when experimenting with a sequence. Plus it looks really cool!
    When the Direction selector is set to one of the first four directions the sequence is linear, meaning it will advance +/-1step (1, 2, 3, 4, etc. Or 16,15,14,13, etc).  The next four directions from the Direction selector will be the same as the first four, as far as a direction goes, but it is no longer linear. It will jump steps but still follow the same path (1, 9, 2, 10, 3, 11, etc. Or 16, 8, 15, 7, 14, 6, etc).

    The Direction selector has the following choices
    Directions 1-4: Linear
  • Fwd
  • Bck
  • Ping-Pong 1
  • Ping-Pong 2

    Directions 5-8: Jump back and forth 9-steps
    (1, 9, 2, 10, 3, 11, 4, 12, 5, 13, 6, 14, 7, 15, 8, 16)
  • Fwd
  • Bck
  • Ping-Pong 1
  • Ping-Pong 2

    Directions 9-12: Jump and reverse
    (1, 16, 2, 15, 3, 14, 4, 13, 5, 12, 6, 11, 7, 10, 8, 9)
  • Fwd
  • Bck
  • Ping-Pong 1
  • Ping-Pong2

    Direction 13: 
  • Random




      I chose to make most of the components SMD to save room on board space. Plus I only have one board to work with, instead of having stackable boards. This prototype PCB has a lot of issues with it but I should have a finalized version soon. If your interested in obtaining a PCB of this (and you can solder SMD's) let me know. 



      I need to find some taller pots for the Direction and Step knobs. The knobs I bought don't fit too well.

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