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calibrating gain cell tweak https://modwiggler.com/forum/viewtopic.php?t=214159

R&S schematic https://modwiggler.com/forum/viewtopic.php?p=3102345&sid=66a66805734ad245573be84d43d28e06#p3102345

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and https://modwiggler.com/forum/viewtopic.php?t=164575

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DTG ou DUSG

op-amp upgrade https://modwiggler.com/forum/viewtopic.php?f=17&t=165806

STS values https://modwiggler.com/forum/viewtopic.php?p=1561757#p1561757

and some extra build info http://www.loudestwarning.co.uk/portfolio/dusg/

From Charlie himself, 2021 : I would use Ken's suggestion of 100K / 1N on the trigger input, I use a 10N timing cap where the PCB says 22N so you get faster operation. I also use 68K or 75K where he says 68K but bear in mind the lower the resistor the greater the range, so it can get hard to set accurate frequencies etc, ie the knob will cover a greater range from slow to fast! the LF353 / OPA2134 chip choices are good, but the resistor connected to E doesn't matter (ie 82K or 75K) unless you want to start fiddling around with tracking trimmers, which is a pain in the arse! The 220R I don't know why he suggests that so I use 100R as per PCB, but I always socket the LED resistor, that's the 1K at the bottom of each slope, that way you can choose to suit your LEDs.

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- CGS59 for the 4 rows

- CGS28 for vertical sequence (source)

- homemade cv adress

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THEORY

Allen Strange. Electronic Music Systems, Techniques, and Controls : second edition (1983)  [ link 1 ] [ link 2 (HQ) ]

Daphne Oram. An individual Note (1972) [ link 1 ]

Rich Gold. An Introduction to the Serge Modular Music System (19??) [ link 1 ]

Jean-Paul Verpeaux. Technique complète des Synthétiseurs : Volume 1 (2011) [ link 1 ]

http://www.synthe-modulaire.com/t682-lexique-de-la-synthese-analogique-modulaire

     more serge here

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PARTS

Wire

25 cond / 24 AWG : http://abra-electronics.com/wirecable/round-communication-cable/cc25-round-communication-cable-24awg-25-conductors-cc25.html Open the cable by pulling out the cord inside, staying close to 90°, and you will end up with a lot of 24 AWG wire in different colors, for a good price .

Bananas

Plugs (more info) http://www.ebay.com/itm/151160777893 alternative seller : http://www.ebay.com/itm/140968659808

Cable x

Jacks

Mouser has usually the best prices when you want a lot.

White : 108-0901-001 Red : 108-0902-001 Orange : 108-0906-001 Yellow : 108-0907-001 Blue : 108-0910-001 Grey : 108-0913-001

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WITH INKSCAPE

Here is how I setup Inkscape for designing front panels.

1 - Preferences

First, you need to make sure of the following, so Inkscape won’t round coordinates values :

Edit > Preferences > Tools

And this (so Inkscape will be precise) :

Edit > Preferences > Input/Output > SVG output

2 - Document properties

Designing modular panels can have the particularity that designs may contains inches AND millimeters.

In this case, I will use the standard LoudestWarning suggests (here). The size of the panel is in millimeters, the distance from the fixation holes to the border of the panel is in millimeters, but the hardware (jacks, pots, ...) is on a 0.75″ grid (serge standard, north america). It can look complicated but I will show you how to make it simple.

File > Document Properties > Page

In (A) we choose the units of the page. We choose inches because the Serge grids is in inches.

In (B) we enter the dimension. Refer to the standard I talked about earlier. Unit is millimeters. Height is 175 mm. Width is 25mm for a 1″ panel, 50.5mm for 2″, 75.5mm for 3″, etc.

Now let’s set up the grid!

File > Document Properties > Grids > Rectangular Grid : [ New ]

grid unit : inch (because we need a 1/16 inch grid) spacing X : 0,0625 (=1/16) spacing Y : 0,0625 (=1/16)

We want the grid centered to the panel, so in Origin X and Origin Y we are going to put half of, respectively, the width and the length. The size of the panel being in millimeters, we need to switch to millimeters before entering the values.

grid unit : mm origin X : (width) / 2 origin Y  : (height) / 2 = 87.5

2 - Front panel document setup

We will need to setup guides.

Note : You need to understand well the snapping tool!

It is useful to have one centered guide on X and one on Y. This way you can verify your grid is well set up. But this will also be our reference for setting up the other guides.

It is easy to place guides by snapping them to an object you just created with the desired size. For example, to place those 2 centered guides, create an horizontal line (hold Ctrl while drawing it so it stays horizontal perfectly, or snap to the grid), whatever length. Using the “Align and Distribute” window (in the “Object” menu), center it relatively to the page. Then create a guide by clicking on the horizontal ruler (hold click and drag down) and snap it to the line! Same idea for the vertical guide.

Also, when you want guides spaced 1″ apart, create a 1″x1″ square(create a square and edit the dimensions), snap it to the first guide, drag a new guide and snap it on the opposite side of the square. Repeat as necessary!

You may ask :

“Why bother creating squares if I just setup a grid?”

“Because it happened that I setup the grid but the grid doesn’t set up the way I say. Using squares to lay down guides relatively to each other can show you the grid is not what you asked it to be, but it is also useful when you want to put something off-grid.”

Refer to Loudest Warning explanations to know where to put the guides.

I put the lines from the 8 lines grid every 0.75″. And the lines from the 6 lines grid every 1.05″. This way, top and bottom lines for 6 and 8 lines grid are aligned.

3 - Additional info

General fonts thread : https://www.muffwiggler.com/forum/viewtopic.php?t=47734

Loudest Warning designs thread : http://www.muffwiggler.com/forum/viewtopic.php?t=97747

The font I use is Eng_UniversLine. Unlike a regular font, it needs a “stroke” and “no fill”. It’s a perfect font for engraving (single stroke). Last time I saw it here.

More engraving fonts here : http://imajeenyus.com/computer/20150110_single_line_fonts/index.shtml

Title : 11pt (7.2pt futura extended) Labels : 7pt (6.4pt futura extended) Creator name : 7pt (6.4pt futura extended)

Stroke (all): 0.3mm

Fixation holes are 1/8″ and are 3mm from top and bottom.

The top black line is 10mm from top (2pt width). The bottom one is 7,5mm from bottom (2pt width).