16 Event Sequencer

Excuse the hand drawn schematics. They should print out OK.

Features

  • 10 turn pots to dial in control voltage
  • Dialing to lowest position produces a "rest" at that event (no output gate and trigger produced)
  • Gate and trigger outputs with adjustable gate width
  • Adjustable glide/portamento
  • Continous run, Single Step, Single sequence modes
  • Reverse sawtooth available from VCO/clock output
  • Internal or external clock
  • Switches to select last note played
  • Cool looking LED's go 'round and 'round!
    • control logic
    switch hookup
    VCO
    pots and MUX
  • Get whatever 10 turn pots you can, cheap. I got a bunch of 500 ohm pots that I ran off of 2v (from a uA723 regulator), and scaled it back up to 5v with the output opamp.
    • gate and trigger circuitry


    Notes:

    Like a lot of the other modules in OGEE, I used parts I could get my hands on when working as an engineer at PMI. Parts like the MUX-16, 7510, and SW-201 can be substituted with readily available CMOS parts, with appropriate pinout changes.