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    Schematics / SEKU Sequencer

    Schematics.SEKUSequencer History

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    2013-02-24 17:00 [UTC-7] by Blue Hell -
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    SEKU Sequencer by Mauno Tuominen ,page dedicated to this module from there the description :

    SEKU is a two-channel 16-step analog sequencer.Heart of SEKU is CMOS 4520 dual synchronous divide-by-16 counter. RESET-in-jack must be normalised to ground when not used (16-step mode). Length of the sequence can be set to N by patching PULSE OUT from N+1 step to RESET IN jack. When no clock is connected to CLK IN sequencer can be manually stepped from STEP button.

    CMOS 4067 1-of-16 analog switch is used for GATE, CV and PULSE outputs. Inhibit-pin of GATE OUT 4067-switch is clocked at the same frequency as the 4520 with 4001 nor-gate turning each GATE OUT off before turning the next GATE on. You can mute any one of the 1-16 steps with the STEP MUTE switch.

    I have used slider potentiometers for STEP CV adjusting so that it is easier to draw waveforms when SEKU is used as an oscillator. I havent buffered the CV and GATE outputs with op amps in order to keep the power supply simple, just +5V to ground. I have also an adjustable power supply so I can adjust the octave range of SEKU by adjusting the supply voltage (+3 to +5 V or from 3 to 5 octaves in 1V/oct systems)

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