Bill of Materials
Capacitor & Resistor Lookup Guide
Eurorack COMBINE-OR Module Assembly Instructions
If you’ve received your parts and ready to build, the first thing you should do is to check to make sure you have all the parts. Check your kit against the COMBINE-OR BOM. If you’re missing anything we’ll send it to you free of charge.
Soldering the Components
Attention: Changes may occur after the Assembly Instructions are created and the photos may not reflect those changes. Always use the BOM to verify the placement of components.
Resistors and Diodes:
First solder all the resistors and diodes into place. Ensure that the line on the diode matches with the line on the PCB silkscreen. Resistors are not polar sensitive so you may install them in any orientation.
After placing and soldering your resistors and diodes please place all of the jacks as seen in the above photo. DO NOT SOLDER THE JACKS AT THIS POINT! The front panel will need to be placed on the jacks (for proper alignment) before soldering.
Now carefully place the front panel over the exposed (and unsoldered) jacks.
Now add all of the nuts onto the jack threads.
Now GENTLY tighten (just a touch) the nuts all-the-way into place.
Continue by turning the module over and begin soldering all jack connectors on the PCB (there are four per jack).
SUCCESS! After the jacks are soldered you are done and your module is ready for testing and use. If you are interested in making an 8 Channel Passive Mult., just REPLACE all of the diodes with resistor / diode lead clippings and leave the resistor spots empty. If you are making a passive mult., please do not combine voltage signals as this can damage modules. Instead, just plug ONE voltage source into any one of the jacks for FOUR multiple outs of that one voltage source per channel.
—TESTING OR LOGIC—
TESTING WITH GATES / TRIGGERS:
Plug in a Gate or Trigger into Input A on Channel 1. Plug in another Gate or Trigger into Input B on Channel 1. Plug in another Gate or Trigger into Input C on Channel 1. Plug in another Gate or Trigger into Input D on Channel 1. Take the Output from Channel 1 and plug it into the input of a 1V/Oct Oscillator. Whichever Gate or Trigger is high will be passed through the Combine-OR Output and will modulate the Oscillators frequency.
Repeat the above steps for Channels 2 – 8.
TESTING WITH ENVELOPES / LFOS:
Plug in a Envelope or LFO into Input A on Channel 1. Plug in another Envelope or LFO into Input B on Channel 1. Plug in another Envelope or LFO into Input C on Channel 1. Plug in another Envelope or LFO into Input D on Channel 1. Take the Output from Channel 1 and plug it into the input of a 1V/Oct Oscillator. Whichever Envelope or LFO is high will be passed through the Combine-OR Output and will modulate the Oscillators frequency.
By now you should be able to confirm that your Either-OR module is working correctly. Thank you for choosing Synthrotek!
The webpage says you can use this kit to make a passive mult, but it doesn’t say how. Do you just use jumpers instead of the diodes? I’m thinking about making one that is half OR and half mults.
Yeah, just replace your diodes with jumpers, and leave the resistors off. This should do the trick, just keep in mind, like it says at the bottom of the assembly instructions, don’t combine any CV voltages that could possibly damage something else.