Gray mean envelopes

The Behringer 2600 (in its various versions, I have the Gray Meanie) is based on the ARP 2600 but with some changes, including some having to do with the envelope generators. Of which there are two, an AR and an ADSR. And there’s a problem with the ADSR that took me a long time to […]

IR Input

I’ve built my modification of the Barton Infrared Input. It’s pretty much as I breadboarded it with a couple of trivial exceptions. One is that I wanted to change the direction of the gate sensitivity/threshold pot… but I managed only to mirror it along with its inputs in the schematic, so it came out the […]

ATTENUɅƎɹꞱƎɹS

This is a Kosmo format attenuverters module. Not much to say beyond that! There are three attenuverters. One has a switch to select 10 V input instead of the input jack. There are jacks for output of the sum and inverted sum of the three channels. Response to slider position is nonlinear, giving you finer […]

Gerbers video

Here’s a walkthrough of the process of getting Gerber files (and the rest of a GitHub repo) off the web and uploading them for fabrication:

All in a week’s work

I built two modules this week: I haven’t installed these in the case yet, but when I do, that will be Kosmodrome Phase I complete. The envelope generator is a duplicate of the Kassutronics Precision ADSR I made previously. The VCO is a new design, part of a larger project which I’ll write up when […]

Ribbon controller video

Reribbon

Some time ago (quite a while really) I discovered my ribbon controller seemed to have stopped working. I opened it up, poked around, decided the SoftPot had somehow become damaged, decided I didn’t want to shell out for a new one right away, put it aside for some time (quite a while really), took it […]

Mod checker

With the number of synth module designs and modifications I’ve been doing, with the number of times I’ve needed an oscillator or a clock or a CV on the bench, with a VCO coming up that’ll need calibrating — I decided it was time to go ahead with a version of the Mutable Instruments Module […]

Playing with fire

The Barton BMC78 Infrared Input is one of those modules that realistically you probably would not use much, but it’s fun enough to want to build it anyway. It’s just an infrared phototransistor, AC or DC coupled to a buffer, with a CV to gate function. Check out the demo. I built the circuit on […]

Bissell envelope follower part 2

I tried replacing (in the simulation) the 2N3904s with MOSFETs. Not that I know anything about using MOSFETs. But the result looked a lot better: Here the gray trace is the EF output. Very fast rise, though it rounds off the sharp peak. One thing you might notice is the cap doesn’t discharge all the […]