Yes! Like a small kosmo?
3 Likes
I ordered some flexible filament and I’m aiming at this:
But this is cool too:
7 Likes
excellent @Jos, really cool !
you will still miss an arm like in the last video of Sam with the glove
2 Likes
Hmm, giving me ideas. I made these last year:
(based on these 3D printed Googly eyes) and I guess I could order some ultrasonic sensors from China. Or I’ll just keep it simple and use a PIR sensor and an FS90R and have it roll its eyes when it detects humans…
5 Likes
I ordered some foot pedals to be able to control e.g. a filter cut off frequency or resonance or whatever when I’m playing an both my hands are busy. But I’m also thinking of using one of these directional sensitive gyroscope thingies as a source for midi control data.
4 Likes
No, it uses 0…+5V.
See here:
and here:
Yeah I was interested in AEModular, I found it cool to be able to put it in a backpack along with some batteries and a bluetooth speaker with line-in. Then I had a chance to play a bit with an Eurorack synth, and I found it small-ish, so I just forgot about AEM and Eurorack and I decided to make a big format modular, first I thought MOTM compatible, then Sam started to sell PCBs… now everything is on it’s way from Asia (that is, everything but ONE component I must have forgotten, Murphy’s law…)
But if you have really small fingers, around 435Euros (or even 328Euros for the smallest system) for a complete real modular synth is a bargain.
I may still get one when my Kosmo one is “complete enough” (if that makes any sense for a modular 
)
[I’m digging deeper and deeper in this forum, always interesting stuff to find…]
5 Likes
Thank you for linking the document, I read it a while ago and it’s been greatly updated since then.
The single 5v thing has been puzzling me for some time as op amps for filters and vca’s normally need a negative voltage to handle AC signals (audio signals).
I imagine that there is some kind of inverter within those modules to take +5v and create a bipolar -/+5v supply.
I’m genuinely interested to find out how he does this!
1 Like
No there is no negative voltage, not even “local” to a module.
Like the DIY Info page says :
Audio signals are usually “centered” to +2.5V, the typical audio level is 3V overall (so the audio swings between +1V and +4V). Some outputs like pulsewaves on the oscillator modules use the full range of 0-5V.
There are single supply OpAmps working down to 5V, but this is quite a pain to adapt any “classic” analog DIY module.
1 Like
I think I get it, for example an ms20 filter in this format would have vref as half of 5v giving +/- 2.5 volts.
I just didn’t know that they could go that low and still work as they should but I guess the audio levels are much lower than normal modular levels.
2 Likes
It won’t work with TL072/4 OpAmps…
You need something like an LM358 (there are many others…)
I don’t know of a 13700 (OTA) equivalent for 0-5V, but they must certainly exist, too.
The audio level is about 3Vpp, vs more or less 10Vpp for Eurorack/Kosmo.
2 Likes
With a 5 V supply, an LM358 can only reliably handle 0-3 V in so might not be ideal. Haven’t looked at any of their designs, but it sounds like they expect you to use rail-to-rail amplifiers (which have more complex input stages to handle voltages close to the rails, and tend to be quite a bit more expensive).
3 Likes
I stopped looking for DIY when I decided AEM was to small for me…
Anyway, LM358 is the only one I remember… and it may not even work 
Do you know of any OTA for 0-5V use ?
1 Like
I’m super curious about the can as well!