Author Topic: MidiStick V2.0: Next gen tesla coil interrupter  (Read 22221 times)

Offline TMaxElectronics

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #80 on: May 15, 2021, 08:51:28 PM »
So after much more time than I initially though I finally got around to finishing this version. And since there are so many more features it it I decided to call it V2.0 :D
I already have some more things planned but since I have some exams coming up they will have to wait a little longer again I'm afraid.

But I also finally made the how to video :) :

Offline TMaxElectronics

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #81 on: July 10, 2021, 03:04:52 AM »
Finally had some more time to play with the interrupter. No new code (though I do have some things planned as always ::)), but I decided to test how the phaser effect I added in the last release sounds on a coil. And well, what can I say other than I think it sounds amazing :P

Here's a short demo video:

I played the lower two tracks with the phaser effect. Since it effectively doubles the OT of notes (by playing two pulses instead of one) it makes the low notes very pronounced. So unlike what TCs usually sound like :)

It might be that it is just a sort of equalizing effect that offsets the tendency of lower notes to be quieter though. I've been planning to add correction for this pretty much since I started the project, but I (still :P) haven't decided which way is best, since dutycycle chances change how things sound significantly. So maybe just play with a constant duty cycle...? Or just add a volume curve that kind of compensates but only a bit to make it less obvious? IDK I'd have to give this some more thought. The max OT idea from Max's code didn't quite sound the way I like when I gave it a try (but that might be my lazy implementation lol).
I can actually add a volume curve in VMS so maybe I'll play around with that first. Final goal of course would be current modulation, but that will have to wait until I finally port VMS to the UD3 :P

Offline TMaxElectronics

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #82 on: December 04, 2021, 11:02:35 PM »
Oh hey, finally some updates again. Sorry about the project seeming a little dead over the past few months, uni has just been taking up all of my time so not much was left for hobbies in general. But I did finally experiment with some more features again.

One thing that always annoyed me was how the sound wasn't very dynamic when the duty limiter was active. When the dutycycle exceeded the maximum by a lot, any volume effects would be effectively worthless, as any changes would be removed as the limiter increased its own gain to get back to the maximum duty cycle. That pretty much killed all adsr effects in some songs, especially when using hypervoice which doubles the amount of pulses the stick generates, increasing the duty cycle further even with low on times. To fix this I'm working on a new duty limiter that works more like an audio compressor. Instead of having a hard limit on the maximum duty cycle, and only doing anything above that, it adds what is effectively a low pass filter to the gain register. That filter has adjustable attack and decay rates, as well as an adjustable release delay. If adjusted properly, the limiter will reduce the overall volume of a passage that has too high of a duty cycle, without affecting the relative volumes of the loud vs quiet parts. I am thinking if it might even be a reasonable approach to allow a duty cycle significantly higher than the maximum for a short time, so short and loud notes won't cause unwanted dips in the volume.
Any thoughts on how smaller coils might behave in a situation where they suddenly play twice the calculated maximum duty cycle for half a second or so?

Then I fixed a bug in the firmware that resulted in a lot of dropped midi events when playing with ardour5 on linux. Interestingly enough the midi drivers there don't seem to care much for the standard which indicates that every USB packet can have a maximum of one midi message and instead package multiple messages into every packet. They Somehow also ignore the message length and pad messages with less than 4 bytes with zeros. The stick now checks for that and will execute every midi command that is sent in a packet instead of just the first.

Oh and I also found a space to record a few videos with my large coil again. They only have a 3ph 16A outlet with fuses I can't replace though, so I didn't push it too far. Anyhow, here's how it turned out :) Both songs are SIDs:

The comic bakery theme is my absolute favourite chiptunes by the way ;)



Offline dbach

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #83 on: December 05, 2021, 12:20:13 AM »
Awesome I’m glad to see this project is still active! I was messing around with a smaller coil today and was having some trouble playing songs, it seems that higher frequency notes got decreased in volume to the point where they were nearly 1/10th of the lower notes? Is this something silly that I’m missing in software? Thanks so much and I’m excited to see how this stick will develop even more in the future!

Thanks so much, Davis.

Offline TMaxElectronics

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #84 on: December 06, 2021, 03:32:15 PM »
That depends heavily on the settings of the duty limiter, the on time and your coil. If the limiter is set quite low, high notes will play with a very short on-time, and if your coil (I'm assuming DRSSTC?) has a high primary circuit impedance the primary current just won't get high enough to create an arc in that time. I've been thinking about adding compensation for slow current gain into the duty limiter, but decided not to since it can be compensated for by allowing for a higher duty cycle.
I suggest you check the coil config for allowable on-time and dutycycle.

There is of course also the chance that the music you are trying to play has a lower volume on those high notes, to go around that you can try using vmpk and setting the volume to maximum. And then there is of course the chance that the song you are playing uses a midi program that has a fast decay rate (the "Bells" one for example has that).

Offline dbach

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #85 on: December 06, 2021, 11:51:07 PM »
Ah that makes complete sense, this is running on my QCW prototype so the primary circuit has quite high impedance. Thanks for the help and sorry I didn’t think of that!

Offline TMaxElectronics

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #86 on: March 26, 2022, 11:16:21 PM »
Whoo finally some updates again :D

I have finally added the smarter duty limiter algorithm that doesn't remove sound dynamics to a point im ready to release it. I've settled on having an option to temporarily allow more than the maximum dutycycle until the smart limiter kicked in, but that is disabled by default.  I'll make a vid explaining how to use this feature and what exactly it does once I have my coil set up for testing again :)

I also added usb audio to the interface. That now allows you to listen to the output on your pc without needing an external cable (for preview/testing). The interface also has a usb audio input, which I think i might use for a zero-crossing detector style audio converter (Something that a few people have already used to play their coil with non-midi instruments before). Then you could just plug your guitar or whatever into the pc and play (SIMPLE) songs/solos live. But since I know the limitations of this sort of audio interrupter i'm not sure if it wouldn't leave more people dissapointed when they inevitably tried playing a song from spotify with it or whatever. I'll have to do some furtehr experimentation with this :)

And finally I also added some more features to the SID playback. One is the option to read data from an external interface, such as the one i made which actually plugs into the c64 itself so you can play live c64 audio on your coil 8)
And the other option was always kind of there but hidden as an advanced option: hypervoice. That makes the stick emulate the pulsewidth register of the sid chip with the phaser sound effect. I've been using it for long enough now to have full confidence in it and will make it a normal (not hidden ;)) option in the next release too.
Oh and i added a register explorer which allows you to see the SID register in real time and get flashy lights when they get changed because why not :)

Not sure if I'll implement anything else until I release this version but if I do ill make another post about it. And I'll make a proper changelog and explanation video of the new features aswell :)

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #87 on: August 06, 2022, 04:06:48 PM »
Finally had a location that would allow me to really turn up the volume, and made a little demo compilation. All played with the midistick. The reverb is from the room itself, not an audio effect ;)


Offline AstRii

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #88 on: August 06, 2022, 07:05:35 PM »
Very nice run, the reverb from the room is epic, it makes it sound less square-waveish and more sinusoidial, especially the bass. You have found the perfect room for this :D
Marek Novotny
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Offline davekni

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #89 on: August 06, 2022, 09:34:35 PM »
Great sound and nicely produced video too!  I like the chapter breaks and subtitles.
David Knierim

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #90 on: August 08, 2022, 09:42:37 PM »
Quote
...it makes it sound less square-waveish and more sinusoidial, especially the bass.
I think its the room improving things as much as the phaser in the midistick is. Instead of the normal one pulse per note I trigger two, while slowly increasing the phase angle of the second pulse. That gives it that brrooooaaaat sound if you know what I mean :P
Thats also what gives some of the lead melody the smoother sound; there I sine modulate the phase at a few hertz which makes it sound like an 80's synth.

It sounds almost as good outdoors ^^

If you guys are interested in what exactly the effects do I'd be happy to make a explainer video with scope traces. But I suspect only few would actually want watch it ;)

Quote
Great sound and nicely produced video too!  I like the chapter breaks and subtitles.
Thanks :D
I think only very few people would actually watch the entire video non stop, and most will instead just skip around. And the chapters make that a lot easier.

Offline davekni

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #91 on: August 09, 2022, 06:08:53 AM »
Quote
If you guys are interested in what exactly the effects do I'd be happy to make a explainer video with scope traces.
Don't know that a video is needed, but I do have a few questions:

Quote
Instead of the normal one pulse per note I trigger two, while slowly increasing the phase angle of the second pulse.
By "phase angle", do you mean the spacing between the two pulses as a fraction of the note period (1/note frequency)?  Presuming so, roughly what is the range (starting and ending separation)?

Are all notes double-pulsed as above, or only melody?

Quote
Thats also what gives some of the lead melody the smoother sound; there I sine modulate the phase at a few hertz which makes it sound like an 80's synth.
Roughly what is the amplitude and offset of this "few hertz" modulation?  In other words, what is the minimum and maximum pulse spacing (as a fraction of note period presuming that's what phase means)?

Finally, not directly about this post, what does your algorithm do with overlapping pulses from different notes?

Thank you in advance for the info!
David Knierim

Offline TMaxElectronics

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #92 on: September 19, 2022, 11:43:47 PM »
Whooo finally some news again! It's been a while but it is quite big news.

The new software features I've been promising for months now are finally in the testing and verification stage. One issue that has already popped up with the real time audio is a very noticeable delay when using windows 11. That makes any instrument really weird to play, so I'm still working on a fix for that.

But the real big new is a new Hardware revision thats in the works. Well two different versions to be specific. I've started cooperating with HiLabs (some actual musicians :D) by supplying midisticks for their shows and been getting some usablility as well as feature feedback. The biggest issue (predictably :P) is ruggedness of the bare PCB. So after some back and forth I decided to move the midistick away from a USB stick format towards a more rugged (though a little bit bigger) converter box style. The new version will be completely enclosed in an aluminium extrusion, making it about as rugged as it can be. It will likely also get a usb c port instead of the ugly usb type b :D



It will no longer be a midiSTICK but I think I'll still keep the name :D
The functionality will be all the same.

The second version I've started work on will be a version with more channels. For now I'm only planning two but with the cheapness of the effinix FPGAs the sky is the limit when it comes to outputs. That version will have a few more benefits, such as
  • a hardware audio input that has zero cross detection capability (including the adjustable bandpass) that will be latency free
  • a hardware midi port to allow effortless control from non-usb devices
  • a small builtin user interface to select presets, configurations etc

And finally as a bit of a roadmap I also have some more software improvements in the works
  • real time tone control (bass mid and treble controls)
  • full graphic equalizer
  • loudness compensation for higher notes (something I've been planning on for a while...)
  • more sound hardware emulaion (ym2149 for example)
  • rework of the software... make it much nicer to use :)
  • For the far future: frequency response measurement, loudness response measurement etc. to make the stick compensate any sound shortcomings automatically

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Re: MidiStick V2.0: Next gen tesla coil interrupter
« Reply #92 on: September 19, 2022, 11:43:47 PM »

 


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[Solid State Tesla Coils (SSTC)]
davekni
September 21, 2022, 05:50:15 AM
post Re: Musical interrupter problems
[Solid State Tesla Coils (SSTC)]
RoamingD
September 20, 2022, 10:29:41 PM
post Re: Musical interrupter problems
[Solid State Tesla Coils (SSTC)]
Mads Barnkob
September 20, 2022, 08:24:30 PM
post Re: Driverless Single Mosfet Relay interrupted SSTC? - [All kinds of problems]
[Solid State Tesla Coils (SSTC)]
TiagoBS
September 20, 2022, 06:23:54 PM
post Re: Some questions about my first drsstc.
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
September 20, 2022, 05:20:07 AM
post Re: TO247 mounting
[Beginners]
davekni
September 20, 2022, 05:15:35 AM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TMaxElectronics
September 19, 2022, 11:43:47 PM
post Re: TO247 mounting
[Beginners]
Weston
September 19, 2022, 09:58:56 PM
post Re: Some questions about my first drsstc.
[Dual Resonant Solid State Tesla coils (DRSSTC)]
mthome4
September 19, 2022, 09:05:35 PM
post Re: Musical interrupter problems
[Solid State Tesla Coils (SSTC)]
RoamingD
September 19, 2022, 12:58:35 PM
post Re: UD2.7 dual Purpose Use
[Dual Resonant Solid State Tesla coils (DRSSTC)]
FonziDaytona
September 19, 2022, 12:13:46 AM
post Re: MMC capacitor crash
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
September 19, 2022, 12:09:22 AM
post Re: UD2.7 dual Purpose Use
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
September 18, 2022, 11:38:51 PM
post Re: UD2.7 dual Purpose Use
[Dual Resonant Solid State Tesla coils (DRSSTC)]
FonziDaytona
September 18, 2022, 10:41:54 PM
post Re: Musical interrupter problems
[Solid State Tesla Coils (SSTC)]
davekni
September 18, 2022, 10:31:32 PM
post Re: Musical interrupter problems
[Solid State Tesla Coils (SSTC)]
RoamingD
September 18, 2022, 10:09:33 PM
post Re: UD2.7 dual Purpose Use
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
September 18, 2022, 09:58:34 PM
post Re: UD2.7 dual Purpose Use
[Dual Resonant Solid State Tesla coils (DRSSTC)]
FonziDaytona
September 18, 2022, 08:45:21 PM

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