Second batch of the old school VCA has landed. A few minor changes have been implemented in the design to get rid of the annoyances I encountered using them. And since I’m the C-level executive of S&C, whatever I say goes! I also empty the trash bin and mop the floor, comes with the perks of being a one-man company. But, more to the point:

  • It’s has a black front panel now.
  • An extra CV input has been added for all your tremolo or other CV shenanigans. One of the CV’s goes directly to the VCA while the other one has an attenuator. This makes much more sense.
  • The output has been boosted a little bit.
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For another project I’m working on I needed a multimode filter. For the uninitiated, its a single filter that has a HP/BP/LP function, and does it all simultaneously. An OTA design is fairly common for this type of filter, so that’s what I did. Now, there are a zillion different implementations to be found online, so why not adding one more to the confusion. After all, chaos reigns supreme.

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I accidentally, a filter. Who knew that could happen. Maybe I’m picking something up about that whole electronics stuff after all. One can dream. But here it is and I proudly call it VCF-2, quite original, I know. But I ran out of cool sounding names a while back so I’m going the descriptive route.

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There’s that saying that you’ll never have enough VCA’s in your modular system. IMHO you never have enough of anything in a modular, but let not digress. VCA’s are useful little buggers that you simply can’t do without. I’ve build a variety of them in the past, mostly incorporated into other more complex modules, but I thought I might as well just make a few standalone ones. I’ll probably post more approaches to the VCA issue in the future.

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You cannot build a modular without any mixer modules. I’ve made quite a few mixer modules by now and I noticed I hadn’t put anything up online. So, I’m rectifying this oversight with this post.

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One needs an LFO. How else could you go wob-wob-wob?

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I’ve been asked if I could do a workshop about synth building. While there are no solid plans to do so yet, I was thinking about what to build during such a workshop. It would be cool to have something to take home you’ve build yourself during the workshop, and even better if it was actually useful. While I was thinking more along the way of simple CMOS based noise-making machines, I was asked whether a filter would be possible. People like filters and if it could be CV controlled, it could be useful even for more advanced synth enthousiasts.

(edit: a workshop has been planned @ the pulse modular music festival in Opwijk, Belgium on 15/06/19)

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I found myself short of an ADSR in my system and it annoyed me to no end I hadn’t thought of buying a few more. Instead of hitting the favourite Eurorack module dealer for my fix I went googling to see if I could cook up one of my own. Couldn’t be that difficult. Right. Turns out, there are tons of useful ADSR schematics floating around on the internet.Read More

This is an envelop follower. Since I build an input module I kinda wished I had one of these so I made it a little project, fun for the whole family well, not really, but anyways..)Read More

Since Coolaudio started reissuing old IC’s used in various synths I always eyed the V3340, which is a reissue of the CEM3340 chip as used in many classic synths such as the Roland SH101, Prophet 5, Memory Moog and plenty of others. It’s, in essence, a fully featured 1V/oct oscillator on a single IC and thus takes away a lot of the headaches inherent to VCO design. Things like linearity and temperature compensating are taken care of for you. This takes away a lot of the pain of building VCO’s, in fact, since these IC’s are available again a DIY polysynth starts to become a possibility.

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