tiefpunkt's log

Making some noise with the two synths, the sequencer, and a guitar multieffects box I had a home. All through the matrix mixer. Got some really awesome sounds.

Also realized that I probably should have built a bigger mixer.

Got the PCBs for my sequencer this week, and finally managed to put them together. Still a few issues with the boards. I missed the mounting holes for the pots, and also forgot to connect two pins. That was easy to fix. Now, there still seem to be some other issues, but we’ll figure those out eventually. But still, quite surprised the whole thing works at all \o/

Spinach is starting to grow in the fogponics setup.

Built a 3x5 Matrix Mixer for the synthesizers. Just som 100k log pots, 10k mixing resistors, a few jacks and a bunch of wire. Probabl about 2 hours of soldering, glueing, and fixing design errors in my laser cut case. Works like a charm now.

Built a new hydroponics box today. This time, instead of a straight Deep Water Culture, I chose to give fogponics a try. Bought a small fogger, and placed it in one of the shallower IKEA boxes. Also added a small airstone, and connected it to the new bigger airpump I bought.

I used 50mm net cups filled with hydroton, and placed the seeds in small pieces of hand towel paper.

The fog looks amazing, and I’m really exited to see how this turns out.

Testing the fogger for my new hydroponics setup.

Did some more work on the Atari Punk Console in a telephone last week. I decided to use the circuit in the phone and mix it together with the synth, so you can now make sounds on the synth and lay some DTMF sounds onto it by pressing the buttons on the phone. Works fairly well. I’ll call it the “Atari Punk Phone”

I also added a power jack, unfortunately the wrong size, and found a spot in the circuit that adds a lot of noise when you touch it. So I’ll probably add some kind of metal knob to the case to trigger that from the outside.

Built an Atari Punk Console today, and put it inside this phone we found in the dumpster. Looks funny, but I don’t really like the sound of it.

Still a good addition to the Synth family for Make Munich this year.

Built a small speaker cabinet yesterday, for a little nicer testing of my synths. Not sure if it sounds any good, didn’t do any calculations on it, and the speaker was one I had lying around somewhere.

Might still add a speaker grill to it, with a nice custom logo up front.

Design files are up on YouMagine, if you want to build one, too.

Last night, I put a prototype of the Auduino Synth onto perfboard, and into a case I made the day before at the FabLab.

I used an Arduino Pro Mini, because it’s much smaller than the Uno oder Duemillanove (Leonardo won’t work with the Auduino Firmware), but due to the weird placement of the analog inputs 4 and 5, I had to put one of the potentiometers on A6. No big deal, just  something to worry about.

There’s 5 3.5mm jacks in the back, for CV inputs. They are connected with all 5 potentiometers, and will disconnect them when you insert a plug there. They take 0-5V, and I was planning to add Zener diodes for over-voltage protection, but forgot about it when putting this together.

On the right, there’s the audio output. It outputs a mono signal, but I was planning on adding a jumper so you can at least get a stereo signal, if you want to. There’s a filter connected between the PWM output of the Arduino, and the jack, to clean up the signal, and bring the amplitude down to line-level.

For the case, I used some lasercut 3mm MDF on the back and the front, as well as 2mm acrylic for the front, to make the dials sit flush, and let the whole thing look a little nicer.

I didn’t add a power jack yer, because I didn’t have any. So for now, it gets powered via the FTDI connector of the Arduino. Need do fix that.

Other planned additions: A switch to switch between the default pentatonic scale, chromatic scale, and no scale at all. Also might add some sort of gate functionality on the synth for my yet-to-be-build sequencer.

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