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new drsstc based upon my new driver topology(Musical DRSSTC)

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Capper

Mon Jan 14 2008, 10:35PM

Registered Member #914 Joined: Fri Jul 20 2007, 06:22PM
Location: South Bend, IN
Posts: 85

I posted my code and schematics for my Atmel ATmega16 MIDI controller on the AVRfreaks and Geek Group sites over a year ago. There are no secrets there. The MIDI interface is rather simple. You read in MIDI data in three byte packets, then use a look-up table to determine the correct frequency for the MIDI note, then program a PWM output on the microprocessor for that frequency and output that on an optical fiber link to your coil driver board.

MIDI Coils Link

AVR Project link

Scott

Reaching

Mon Jan 14 2008, 11:20PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

theres simply no need to copy others work.

and really,,, and i want a true answer. would you start with such a controller for you very first microcontroller project??
the answer in 99% will be "no, lol, noo."
why go the complicated way? i found my way, you found yours. thats the simple relation. this discussion seems to go like "microcontroller, yes or no" and thats the last i wanted.

i found my way to realize what i wanted with the knowledge i have at the moment. whats wrong with that? there are pros and cons for both ways and in general both ways deliver the same results..

so can we stop this stupid discussion about "my circuit is much better than yours" ?? are we in a kindergarden or what??

i posted a way to get same results without this whole lot of microcontroller basics...

capper, why spending time in building a whole computer with keyboard and display... my laptop can do the same a lot simpler without spending months on learning ÂµC and program languages.. i simply used the things i had on hand.. nothing more......if someone has a problem with that, please, let me know

and to come to one point,. i dont use a real music signal to generate my pulses. its no zero crossing detector which makes shit out of shit. thats usable for much forgiving circuits in sstc use or so. all i have done is that what you do steve, but in a other way. i use midi signals to generate a squarewave wave file. it has some benefits just to work with the bare squarewave which includes the data needed to generate the right sound. this file is then fed into the circuit which converts the input signal to pulse data for the drsstc.
it is possible to play 2 notes at the same time and its sounds like 2 notes playing at the same time. its decoded in an other way, but the result is the same. with this methodic it is possible to decode some simple analogue music signals like a bellring or a speech into this data and fed the drsstc with it. thats one benefit, even when it sounds like shit, it is possible to feed the circuit with this data. funny indeed and really one thing you cant do with your way.

Steve Conner

Tue Jan 15 2008, 11:22AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

I made a secret of the musical DRSSTC because I was paid to build it and a condition of getting paid was that I kept the details secret. I'd probably never have bothered to build it otherwise, and I was blown away by how popular the concept turned out to be. The video that the Hacked Gadgets guy put on Youtube has about half a million views now.

You probably figured out by now that instead of reinventing the wheel with microcontrollers, I hacked into the guts of a Roland JX-8P synth and used it as a 6-channel interrupter that could be played from its keyboard or by MIDI. So yes, I like the method that Reaching used, basically moving all of the tricky bits into DSP on his laptop.

I know enough about uCs and synths to know that generating accurate note frequencies without jitter or aliasing is difficult, boring, and generally too much like my day job, and pointless when I knew my Roland already did it and could be bought used on Ebay for about 200 Euro. The JX-8P survived its ordeal fine :)

My tesla guitar @

used a zero crossing detector and envelope detector to produce one pulse per zero crossing, with the on-time set by the envelope magnitude. The envelope doesn't work as well as I thought it would, and complex chords sound much worse than on the JX, but it allows any audio source to be fed in.

Also, yes, we are in a kindergarten...

Tom540

Tue Jan 15 2008, 04:15PM

Banned on 3/17/2009.
Registered Member #487 Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617

Haha I'm not really sure why this became a "mines better than yours" discussion but some people like me just suck and programming. I do have a programmer that uses basic but I need to dig up some of the stuff for it. I haven't a clue how to decode midi anyway. I figure if I tried out the uC method and used midi I'd want to try some regular audio as well. Both circuits are cool and eventually I'd like to try them both.

Now please, no one has cured cancer with their interrupter so enough bickering

Reaching

Fri Jan 18 2008, 07:18PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

Finished my new modulator and played a bit to get the right sound etc. i think i found a good modulation to simulate an e guitar.
the sound is a bit noisy, dont know but i think my microfon distorted...

i think iÂ´ll give it a try in the garden if it stops raining.

Tom540

Thu Jan 24 2008, 05:51AM

Banned on 3/17/2009.
Registered Member #487 Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617

Ive came to the conclusion that both ways are cool I would just like something that isnt limited to one format. I have an idea.

cine

Mon Feb 04 2008, 02:49PM

Registered Member #1242 Joined: Fri Jan 18 2008, 10:41PM
Location:
Posts: 2

Hi Reaching
What application did you use to sample that midi? And btw what circuit did you use with the coil in this topic for the audio modulation. I have successfully reproduced the mhrdrsstc2 from your site and this circuit works quite well but I'd like to be able to modulate it with real audio, not just midis.
Thanks

Dr. Dark Current

Mon Feb 04 2008, 02:58PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

cine wrote ...

Hi Reaching
What application did you use to sample that midi? And btw what circuit did you use with the coil in this topic for the audio modulation. I have successfully reproduced the mhrdrsstc2 from your site and this circuit works quite well but I'd like to be able to modulate it with real audio, not just midis.
Thanks

DRSSTCs can not reproduce "real" sound, just pulses, because this is how they work.
If you want full sound then you will have to make a CW (continuous wave) SSTC with linear output power modulation.

Btw. Nice vid Reaching

cine

Mon Feb 04 2008, 05:29PM

Registered Member #1242 Joined: Fri Jan 18 2008, 10:41PM
Location:
Posts: 2

So what about modulating his 2 MHz Micro SSTC which I have made as well?

Reaching

Tue Feb 05 2008, 11:00PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

made a new vid with the starwars theme.. really nice. the drsstc plays up to 3 or 4 accords at the same time.

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