40 lines
2.4 KiB
Markdown
40 lines
2.4 KiB
Markdown
Notes:
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- Could make the clock oscillilator an external module, with the SEQ listening for a clock on the 16-pin IDC connector when nothing is plugged into CLOCK.
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- A notable issue with this design is the decade counter expects CLOCK to pass 1/2 of V+ (i.e. 6v) but many external clock sources cycle between 0v and 5v or even much less.
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This can be fixed by increasing the gain on the CLOCK op-amp from 1 to something more decisive, like 3x. Then a signal as low as 2v could works as an external clock.
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- One idea: add a switch to disable the clock, and a momentary-on button to advance the step manually. This requires hardware de-bouncing to avoid multiple triggers on each
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button push.
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- Another idea: trigger (button push or CV) starts the sequence, which plays through exactly once, and then stops? Possibly put a switch between pin 15 and the three-way junction, and a NO switch across that switch… it might be fine, just go between +12v and pin 15 with the NO. with the bonus that you can push it to reset a continually-running pattern whenever you want
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- Could replace step IDs with a 7-segment display with a diode matrix to select segments from each step.
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- Could add a global/master pitch control/modulation function with a knob and with CV in implement a DC offset via non-inverting op-amp.
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- A CV in that pauses the clock and keeps current gate open whenever the voltage exceeds a certain threshold (perhaps useful for feedback effects where one sequencer is interacting with another). More of an experimental functionality
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- Input/Output CV to permit chaining of Unseen Servants. For example, Unseen Servant 1 plays its sequence, then hands off to Unseen Servant 2, which plays its sequence and then hands back to Unseen Servant 1 (or hands of to Unseen servant 3, etc.). A jacked CV out with no return implies a play sequence once function?
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UI:
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11 potentiometers
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11 SPDT switches
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1 rotary switch, 5+ positions
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10 LEDs
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3 sockets
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Potentiometers:
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One potentiometer per step, to set output voltages. (10)
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One potentiometer for internal clock rate.
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Switches:
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One SPDT switch per step, to enable/disable gate per step. (10)
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One multi-pole rotary switch to set number of steps. Exact configuration TBD.
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One SPDT switch to adjust CV output range, switch between 5v and 2.5v max.
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LEDs:
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One per step, to indicate current step. (10)
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Sockets:
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CLOCK in
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CLOCK out
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RESET in
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GATE out
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CV out
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