SetonixSynth Doug Manuale utente
Doug ADSR Envelope Assembly Assembly - 4U
Copyright 2023 SetonixSynth. All rights reserved
Hello and thank you for building the Doug ADSR for 4U modular. We hope you will find its mix most
pleasing!
Assembly Instructions:
1. Install surface mount components on the rear of the PCB. We recommend using No-Clean liquid flux
on the board before applying quality solder paste such as Chip-Quik SMD291SNL, tweezing components
onto the board, and reflowing with a hot air station or oven. However, the size of these components
(0805) means they can also be hand-soldered by anyone with reasonable soldering experience.
2. Solder rear through-hole parts: Gain trimmer and MTA-156 power header.
3. Prepare the panel: banana jacks and M3 spacers should be fastened securely to the panel.
4. Insert all frontal hardware and the LED into the other side of the PCB (make sure the short leg/cathode
matches the square pad), but do not solder these parts yet. Double check minor details, such as that
proper potentiometer values (B100k for every footprint on Doug) are used for each footprint. If your
potentiometers have solder tabs, be sure to break them off with edgecutters.
5. Place the panel over the hardware and hand-tighten the appropriate nuts over the potentiometers and
switch. Use M3 screws to fasten the PCB to the panel via the three corner spacers.
6. With the PCB facing up and panel facing down, double check that all hardware is properly seated in the
appropriate PCB holes. If it is, position the front LED so it sits in the front panel hole and solder one leg.
Double check its position, then solder the other leg. Once the LED is set up, solder the potentiometers
and switches in place.
7. Fill each pad labeled for use with banana jacks with solder, then insert a resistor leg or wire so proper
connection is made. Solder the other ends to each corresponding banana jack.
8. Double check your work. Make sure all components have properly flowed and that all hardware is
properly soldered to the PCB. If everything looks good…
9. Plug in your Doug. Patch a repetitive Gate signal of decent length (about 1 second is good, or at least
enough to trigger a slow Attack) into the Gate input and adjust the A, D, S, R and Shape parameters while
monitoring the output. Then, patch the Gate signal (or any Trigger sequencer, etc) to the Trigger input, set
Attack, Decay, and Sustain controls fully CCW, and continue to monitor the output. This should create a
Release-style envelope with variable Shape.
If everything appears to be working:
10. Calibrate your Doug.
Doug has one trimpot on the back which sets the envelope’s maximum output level. Since no real
standard exists, it is possible to calibrate the envelope output to either the typical 0-5V used in Serge
Modular or 0-8V used in Eurorack. We recommend you consult the manuals of your other modules to
determine the Doug’s ideal output range in your system.
Calibration using a multimeter: continue sending a repetitive Gate signal of decent length to the Gate
input. Turn the Attack and Release controls to minimum (CCW) and turn the Sustain control to maximum
(fully CW). On the Voltmeter setting, monitor the envelope’s output and adjust RV6 (Out Level) so that the
peak voltage is at the desired level.
Using an oscilloscope: Use the same settings as above, though the Sustain level can be any setting here.
Monitor the output waveform and adjust RV6 so that the peak level of the Attack is at your desired level.
This is also a good tool for learning about the behavior of Doug’s various controls, and we suggest you
spend a little time playing around with various envelope shapes, inputs, etc.
11. Enjoy your new envelope!
Thank you for building the Doug!
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