S-180 8-step sequencer (4HP)

DSCN6051_s-180 DSCN6055_s-180rev.2: DSCN6276_S-180_rev2

S-180 8-step trigger sequencer for Eurorack / Doepfer A100.

(for longer sequences in 4HP see  S-161 16/32 step trig sequencer or wider  S-332 32-step trig sequencer or S-316 16-step CV/gate sequencer too)

Jacks: clock input, reset input, trig output
buttons: on/off steps, selectable seq length (2-8 steps), 3 modes: down, up/down, random
LEDs: dimmed light = sequence setting, full bright=actual step

to change seq mode (cycling in modes) – push and hold button no.1 for about 1s, LEDs will show selected mode
to on/off steps – push appropriate button shortly
to change seq length – push and hold appropriate button for about 1s

Long press of button 2 works as “manual reset” or “sequence length=2”.
Function of button 2 (its long press) can be swapped by holding button 2 at power up. This selection is memorized.
Seq length is selectable from 2 (or 3 – depends of selected button 2 function) to 8 steps

Button function table:


NEW FIRMWARE (rev. f, since 26/04/15, changes in red):


NEW FIRMWARE (rev. h, since 31/08/15, changes in red):

If you already have S-180 and do you want new firmware, I´ll add IC with new firmware to pack with an newly ordered module for free. Kindly email me your PCB revision (rev.1 or rev.2)



Can be used as clock divider too (up to divide-by-eight):
to “divide-by-three” for example set sequence length to three with first step active only. Incoming clock pulses no. 1., 4., 7… appears on S-180 output…

S-180 family Extensions/Add-ons:
S-181 Outs-8 – Breakout board (individual trigger outputs for every step, 4HP).
S-182 CV-8 outputs (8x step CV + overall CV output range, 4HP)
S-183 CV-8/2 outputs (8x step CV + overall CV output range, shift/transpose knob & input jack, internal jumper for 5V/10V range, 8HP)

S-184 CV-8/3 outputs w. sliders (8x step CV + overall CV output range, 2 shift/transpose knobs & switch, internal jumper for 5V/10V range, 8HP)
P-110 Switchable trig/gate combiner (switchable “dual 3-to-1” or “7-to1 combiner” = logic “or” = max signal selector, 4HP)
Q-010 Easy quantizer (16 scales, VC octave and VC halftone transpose)
S-187 voltage controlled clock/trig/gate modifier (pulse delay and width)
S-188 Voltage controlled clock shuffler (manual or external CV swing setting, 4HP)
S-190 Clock distributor (to chain up to 8 S-180, up to 64 steps, 16 clock distribution modes, 8HP)

S-210 4ch Switch (to switch output CVs to get up to 32 steps, 8HP), can be used for switching audio too

Width: 4TE/ 4HP/ 20mm.
Depth: 55mm /2,2″ max. – rev.2 is shortened to 47mm to fit into US racks
Current: 20mA (from +12V rail, no need for 5V power)
Handy 20cm (8″) power cable included.

Double check power connection before powering your system please.
“Red strip” means -12V connector side in Eurorack standards.
In some power distribution systems connector key can be reverted.
In this case cut connector key and plug power connector right way (with respect to red strip) or use different power cable appropriate to your power system.

Order 8-step sequencer