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Registered Member #55086
Joined: Sun May 24 2015, 03:18PM
Location: Ukraine, Kyiv
Posts: 7
Greetings, folks! We're HV enthusiasts from Ukraine and have already made lots of stuff 4HV community might find at least interesting.
In this thread I'm going to tell about SimpleInterrupter. It's a board which can be embedded in your HV designs to get a lot of cool features: starting from wireless control, advanced MIDI synthesis and finishing with QCW coils driving and ability to build complex orchestras, controlled directly with software like FL Studio or Steinberg Nuendo.
Ok, pretty napoleonic already, but let's take a look at SI's practical side. How do you use it? Since it has Bluetooth module, the main ways of control are wireless, with Android device or PC. Control software for Android called SimpleTesla and can be downloaded directly from Google Play(aka Android Market): https://play.google.com/store/apps/details?id=org.tqfp.simpletesla2&hl=uk
The other way is physical, via optical link. This way allows to control your TC directly from any MIDI-compatible device: keyboards, drums, etc.
Now a bit about software features. SI does: 1. Standard burst-mode interruption; In this mode application emulates calssic bursted-mode interrupter, usually build with 555 timers.
2. MIDI playback features. This mode allows to play MIDI files directly from SD card. The player has tons of fancy features, such as synthesis effects(ADRS, Portamento, LFO), time and volume control, track selection, etc.
3. Safety and limitation settings. In this mode you can set limits of output frequency, output pulse width, select TC type, input mode, etc.
4. Dynamic pulse width. With it you can play notes as high as 2000 Hz without any damage to your DRSSTC. The pulse width depends on playing note and limiting settings. The graph below shows the dependance:
And in conclusion, here's a little video which shows SI-based design playing Nyan Cat with violin-like sysnthesis effects.
Registered Member #55086
Joined: Sun May 24 2015, 03:18PM
Location: Ukraine, Kyiv
Posts: 7
Testing multicoil playback. Feature is quite unfinished, but it works.
Standard Bluetooth wasn't designed to be a real-time link, but it works great due to constant "keep alive" NOPs. Also, looks like BT host can communicate with up to 7 recievers at the same time, which mean we can play quite complicated MIDI tracks.
PC software looks spartan right now, there's no ADSR/LFO/Portamento or other settings, but we're working on it.
Here's how setup looks at this moment. Freaking mess.
Registered Member #1637
Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83
We'v put a lot of effort in this little thing, so it's for sale and not OSS/OHW yet. We sell those for moderate 50$ a pop, you can buy them in our shop -
You can also see SimpleInterrutper in action in old threads such as this -
Registered Member #55086
Joined: Sun May 24 2015, 03:18PM
Location: Ukraine, Kyiv
Posts: 7
Mads Barnkob wrote ...
I like your little tool, I would already want to own one ;)
Great features in a small package, looking forward to further development.
Is this a open source /open hardware project or are you planning on selling these?
Thanks for kind words. Yup, all the stuff was open source at the beginning, but then projects went really complicated and people started buying our stuff. Eventually, it turned out to be a bit more than hobby. Right now we're mostly known among post-Soviet coilers and I thought... Well, that our designs could also be interesting for western audience.
Other stuff is mostly SI-based, but also interesting. Briefly, we also made phase-shifted QCW driver and several DRSSTC kits. I'll make a few mini-articles in separate threads.
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Bluetooth MIDI Interrupter (TQFP)
