ProtoTypo PT4 – Pairs

While working on my Monster Base (eurorack) case the thought occurred that maybe it would be nice to have some buses to route signals internally from one end of the case to the other, instead of running long patch cables (which can get messy in no time). And that’s this build, the ProtoTypo PT4 (models A and B) in all it’s simplicity.

For the panel artwork, the boring version would’ve been to use matching numbers on both panels. However I like my modular setup colorful, so I finished up the build with a twist on the Find The Pair / Memory game. Each of the bus pairs have similar images to label them:

PT4a panels

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Eurorack Monster Base, design

Shortly after completing my TTSH build I started longing for some added functionality, as in having more function modules to patch sounds with. I then got into eurorack modular synthesizers, cobbled together a small desktop case (photo below) to house some modules in, and ran out of space shortly after. I have heard this is a very common story among modular synthesizer hobbyists ;)..

Oh well, looks like I’m about to design & build a bigger eurorack case!!

My first 3U 84hp eurorack skiff..

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TTSH, miscellaneous mods

I started putting together a build post about the electronics side of my TTSH, but there really isn’t actually much to write about that. It’s a kit, and they just work straight-out-the-box when you learn even the details before starting and keep soldering sessions at reasonable lengths (don’t rush the build!).

That said, building mine was probably the first time ever in the ~20 years of electronics hobbies, that I managed to install a resistor of wrong value, in this case to VCO2 triangle-to-sine wave shaper circuit.. Live and learn; had some D’OH moments doing a part-by-part trace of the entire circuit :)

Anyway I thought I’d bundle some of the simple mods under this post. All these three were suggested by user Nordcore in the various TTSH build threads the Muffwiggler forum. Read More…

TTSH, spring reverb mods

Alritey let’s continue details of my TTSH with two spring reverb modifications. If you’re looking for other build / modification posts on the project, please visit the main page right here.

Opamp Upgrade

This modification is done to improve the noise floor of spring reverb, by upgrading the opamp in the output amplifier circuit (recovery amp). The mod was suggested by user Nordcore at Muffwiggler forum and looks like this:

TTSH reverb driver mod schematic by Nordcore.

TTSH reverb driver mod schematic by Nordcore.

I sort of failed with adding this mod in that I didn’t bother taking before and after audio recordings: So it’s rather impossible to say how much the noise floor was effectively reduced. On my TTSH the circuit was noisy before and is noisy after.. Yet I’d still say it’s better.

On to the build..:

The reverb driver circuit in its stock config

The reverb driver circuit in its stock config

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ProtoTypo PT3a – BUM

Time for the next ProtoTypo build! This is a quick one I’ve been working on during the past week, and for a change I thought I’ll just get the build documentation out of the way while I’m in the zone (noooot!).

Behringer VMX 100 Dj Mixer

It’s a Behringer VMX 100 Dj Mixer. Photo by internet.

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