Mix it up

Next Kosmodrome module is a mixer. Three inputs, DC coupled, with regular and inverted outputs and a bias control. It’s intended mainly for mixing CV signals. I looked at some designs online but ended up coming up with my own. The MFOS Quad DC Mixer was my starting point but I made lots of changes […]

VCA VCA

Not much to say about this one — the Music From Outer Space Dual VCA. I built it, I didn’t change anything (except to add a Euro/Kosmo power breakout), it works. It’s 75 mm wide, which isn’t on the list of official Kosmo module widths, but so what? I thought 100 mm would be too […]

Lots of noise

My next few Kosmodrome modules will be ones based on Music From Outer Space designs, because the boards are available from SynthCube and SynthCube had a 20% off sale Thanksgiving weekend, so I bought them then. It’s been a long time since Thanksgiving, I’ve not been doing much building, but the first one’s done now. […]

Modules from Outer Space

Three days, three packages. Wednesday, Tayda: Miscellaneous capacitors, resistors, diodes, transistors. Some panel pots and a bunch of trimmers. Ripple counters, TL07xs. Screws and spacers. Thursday — Thursday! Thanksgiving Day! USPS! I Know! — DigiKey: MIDI sockets, JFETs, resistor arrays, 7555s, DACs, pricey op amps, optoisolators, still more trimmers. Friday, SynthCube: Transistor arrays, tempco resistors, […]

Multiple multiples

The multiples module is the only module I’ve planned for Kosmodrome that’s designed by someone else in Kosmo format. Everything else is more or less based upon something designed for Eurorack or other format and konverted to Kosmo by me. But this is the Buffered and Passive Multiples by Cory Torpin, a.k.a. CTorp, of the […]

Twofer

Two new modules in one day! Well, one of them hardly counts. Still. Back to Kosmo format. Here’s the Sallen-Key VCF from Barton Musical Circuits. The board was designed with Eurorack in mind. It’s small, and rather densely packed. Still, no problems assembling it and it went together quickly. As designed the pots are all […]

Case two part two b: VCO

I’m now thinking about whether to change my plan for the (first) Kosmodrome VCO. What’s prompted this is Sam saying he’s going to consider a Mark 2 LMNC VCO. Sounds like it would address the output levels, add a sine output, maybe ditch the 3340 pulse wave in favor of creating one from the triangle […]

Case two part two a: MIDI-CV

I’m kind of surprised how few DIY MIDI/CV modules are out there. Befaco has one… LMNC has one, but it’s too powerful! It offers a lot of functionality I currently would not use, and its 100 mm width would be wasted on me. There’s not much else, but there’s the Erica Synths one. I believe […]

Case two part two

I’ve been doing more thinking, planning, designing. If this new case is going to be, conceptually anyway, a synth capable of standing alone and not just more modules added to the ones I’ve got, then maybe that synth needs a name. Kosmodrome? Maybe. In deciding what to put in it I looked to the old […]

Case two

My new synth case was planned in mid spring as a replacement for and expansion upon my temporary Eurorack case, but making it was delayed in the futile hope the pandemic would abate more and sooner than it has. During said pandemic I’ve done a lot of building, so by the time I finally made […]