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Tag: electronics

DIY Audio: UNPLUGGED

by on Apr.11, 2012, under building, Craque

Probably around five years ago now, while much further in the depths of a thrice-laid-off financial hole the technology industry bestowed upon me, I became fixated with actually building my own electronic instruments. Ensuing the expertise to make music that way, I departed into the wide unknown universe of DIY audio.

The first time I encountered a small, personal modular synthesizer was during a long gallery installation and collaborative work by Achim Wollscheid in Chicago (I also happened to have given him a ride to where he was going his first night there, and had rich conversations for the short time we were all together). I had my motley collection of contact-mics and sampling objects and looping pedals and probably what could be called a portable John Cage concert, which I used to improvise alongside Achim as he did the same over enormous loudspeakers placed in the ceiling of the large public space in this gallery (yes, I recorded). Anyway, someone else coming in to collaborate set up next to me on the balcony overlooking the space, revealing a portable Doepfer A-100 suitcase model.

That’s when it was over. That’s the exact moment when a lot of things clicked, but apropos to our topic it was definitely the first time I felt the urging pang of modular desire, and barely realized it.

Fast forward ten years; as of 2012 I am the proud owner of a new disease known casually as idiomatic modularsynthacropy, or the addiction to building complex systems realized by modular synths. I think it’s genetic, because this is an occupation my wife lovingly calls “The Rocket” due to my studio resembling a half-built starship cockpit (or at least the bar in one), and my brother being an actual rocket scientist.

It first manifested itself after Chicago “event” in the form of electronic tinkering and eventually the building of my own simple devices, made specifically to be used alongside other analog/acoustic instruments of improvisation. As it happened certain events also related to my unlucky job streak in the Internet business ended up affording me a barebones entry-level one 3U rack half-full beginner outfit: 8 ‘eurorack’ style modules, the format Doepfer popularized, and in fact some are the very same kind I had first seen in that suitcase ten years ago.

Muffwigglers is the forum for this disease, and there’s even a forthcoming documentary. A lot of the musicians I admire the most are modular users, and I’m happy and fortunate to join their ranks along with a pretty decent wealth of electronic building knowledge under my belt in addition to the musicality. So I shared some of my accumulated knowledge recently on that forum, and wanted to post it here and add a bit of history.

 


Everything listed here except for the first book were published after I started into the DIY world of audio, and after spending literally DAYS of searching and reading electronics tutorials and articles online, they have become my ‘go-to’ stack for reference and inspiration.

1. If you aren’t familiar with Forrest Mims, get familiar with him. I just picked up Vol I. of his “Engineer’s Mini Notebook” series, which is titled: Timer, Op Amp & Optoelectronic Circuits & Projects. It should have been titled: The Building Blocks of Analog Modular Synthesis, and I wish I had discovered it five years ago when I first started into building this stuff, cause it is indispensable. All the “how do i build a 555 timer?” and “how do i correctly power an opamp?” or “what frequencies do i get if i change these resistors?” questions that you search for hours on the Internet? It’s all in here – there’s even a chapter on photocouplers – aka ‘varactors’ – which are used a lot for CV audio systems.

2. Another specific project-oriented book but much more glossy and full of awesome examples and a DVD (which I haven’t gotten around to watching yet, shame on me) is Handmade Electronic Music by Nicolas Collins. This one is specific to DIY audio hacking and electronic building, covering everything from building oscillators (different chips than the Mims books!) to circuit bending and experimental electronics.

3. Make has started releasing awesome print publications (I have two of the Maker’s Notebooks and love them). The one I’ve found the most applicable and helpful to audio DIY is by Charles Platt and is one of the first: Make: Electronics. Simple, easy to understand tutorials on the foundations of… well, making stuff. With Electronics.

4. Finally the most general of all of them but something that is a great learning resource for a wide range of electronic applications, by Michael Jay Geier, How to Diagnose and Fix Everything Electronic. The title doesn’t lie. Every chapter is basically a Cliff’s Notes on that particular subject or piece of equipment, summarizing how it works, what might go wrong with it or often does, and how to troubleshoot and fix it. It also includes quick introductions to fundamentals of physics and other things related to electronic parts and machines… and most importantly to us, a wonderful introduction to oscilloscopes and how to both choose and use them.

All these books together will probably cost you as much as a good VCO module! lol But they are worth it, I highly recommend any of these to the DIY audio muffer.


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Morton Subotnick Interviewed

by on Nov.29, 2011, under creativity, External, listening, Music Tech

This is a great interview of an awesome figure in electronic music, done just recently (2011) in Madrid by the Red Bull Music Academy:

Listen to a free stream of Silver Apples of the Moon on last.fm.

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“Booglitchoo” Synth Prototype

by on Jun.22, 2011, under building, Craque, Uncategorized

Here we go… I’ve optimized the way I’m using power, love the way the dual jfet opamps (TL082) sound, and have the mixing elements mostly decided.

To be done on this prototype:

  1. use either capacitor switching or a simple 4017 sequencer to change up the textural possibilities of the oscillator
  2. add switches to the voice modulator to allow for “skipping around” pitches instead of only up or down changes
  3. CV input

I went through quite a few opamps before finally deciding on the dual jfets, and now I really dig how they’re working with the complex waveform of the four NAND gates (NTE4093)… I use it first as a multipole low-pass filter to shape the sound of the chained oscillators.

Because of the nature of the sounds I don’t find much use for the vibrato section of the voice modulator (HT8950), but don’t mind at all because it reduces the component count and I’m finding an incredible amount of possibilities already. You’ll also notice I’m using my fingers on a couple of resistors to change the pitch… I discovered this by accident, but really like the gestural aspect of it so much that I’m planning on building a touch interface into the final design. 🙂

The whole thing is finally mixed into another dual opamp, with a follower/buffer and a high-gain resonant Q notch filter to add some harmonics and really cool sweep possibilities.

Excited to have this core design done, LOVE playing with it! Now it’s just a matter tweaking and expansion.

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