ProtoTypo PT1 – WOTI

Yay it’s a firstie, my soft landing to the world of Eurorack: A DIY version of Xaoc DevicesPOTI expander for Batumi (a quad LFO module). “What is ProtoTypo?” you might wonder? Then check my previous post.

The Build

Simple one yeah: three toggle switches mounted on a 3HP euro panel and connected to a 6-pin ribbon cable. Haven’t done anything this straightforward in ages, but still it’s a good crash course into eurorack mechanical specs and the like. As for Poti, there’s a good set of pictures of it at the Schneidersladen webshop, from which it’s easy to interpret wire connections.

Heatshrink stress relief for the cable solder joint

Heatshrink stress relief for the cable solder joint

Here’s a good generic build tip: As switches are connected to Batumi using flat cable (see photo below), it’s very much recommended to add some heat shrink tubing to cover solder joints. This is because flat cable is thin and flexible, and soldering any of its wires creates a sharp stiff-to-flexible transition point. If the cable is moved or flexed repeatedly then the wires will easily break off at this spot. So adding heat shrink over the joint will distribute the weight of cable to a wider area and thus lessen the risk of broken wires.

Cabling overview

Cabling overview

...and how it connects to Batumi.

…and how it connects to Batumi.

I have quite a neat leftover piece of this 4cm thick oak kitchen tabletop (from Ikea), so I figured I might just as well use some for building Euro panels. After all 4cm = 8HP (in Euro spec 1HP = 5.08mm / 1/5″) so it’s a perfect match size-wise. Once the oak is cut to 4HP slices 2mm thick, it’s very easy to trim down to required width. Simply running a sharp carpet knife along a ruler repeatedly will eventually create a straight groove deep enough to slice the thin wood panel in half. Minimal sanding required, yay \o/

So with panel cut & drilled, I treated it with white wood stain and then designed and printed a panel decal to a leftover Lazertran sheet (from my x0xb0x build btw!).

Now I have no clue if ‘Poti’ means anything, but I’m a big fan of abbreviations so I chose to call this build ‘WOTI’. That’s short for Wooden Output Toggle Interface. You know, oak panel and all! ;)

The finished module, fancy innit?!

The finished module, fancy innit?!

So there it is, ProtoTypo PT1. Of course I added it to Modulargrid.net too :). You can download the panel decal here for your own build. Poti manual is available from Xaoc Devices’ website.

The design of this module could be squeezed to 2HP too, provided that the switches were of sub-miniature type and/or oriented vertically. However I wanted a design to match Poti, so it was 3HP for me.

That’s that. Next up a ProtoTypo build with even some electronics in it!

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  1. ProtoTypo PT2 – GRAM | My Diy Blog - 08/02/2017

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