Moon Modular M569
Quad Sequential Voltage Source

I purchased a Moon Modular M569 sequencer which is my first Moog/Dotcom format module.  I built new wood side cabinets which has one row for Dotcom format modules.




I use a MOTM-990 power distribution board and built a MOTM-to-Dotcom power cable.



I replaced the 16ESB T5 slide base lamp with a 28ESB (Mouser 606-CM28ESB) to decrease the brightness and covered it with a red plastic cover - much less obnoxious!




This is my first M569 sequence in 4x8 mode.  Channels 1-3 drive the Living VCO and channel 4 drives the 566 VCO modulated by noise through a resonant low pass gate which is modulated by a sequencer gate.




While I like this sequencer a lot, I really want to be able to either slave other devices to it or slave it to another device.  It really needs a Clock In and Clock Out interface.  I emailed Moon Modular to see if they would help me with a schematic of the clock circuitry but they never replied.  I took my unit apart and there is a separate PCB for the clock generation circuitry with a 14 pin interface.  I mapped out the pins and I think it would be easy enough to multiplex these signals so they could be driven from an external source.

Connector top view - key to left

I designed a 1U Companion module that intercepts three signals from the clock PCB via an interconnect cable.  A 1MU module allows these signals to be brought out to jacks or or to use instead external signals.  I like the Moog Sequencer style with a separate Start and Stop jack and switch so I designed a glitchless clock multiplexor controlled by these inputs.  The Start and Stop jacks and switches form a new Start/Stop and Run signal that gate the external clock input on the rising edge of the clock so there are no truncated cycles.  The Start and Run outputs are selected by the switch to be from the M569 or the Companion.  The Reset and Clock Out are always from the M569.  This photo shows my prototype test cable to intercept the signals.  It works quite well.

M569 Companion Schematics  unverified


Finishing Touches

I had 4 MU of panel space left in my cabinet so I made a blank panel from a piece of the rear panel.  It looked bare so I made a decal of the Moon Modular logo.  I finished the panel with two coats of polyurethane over the decal.