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Steve Conner

Mon Jul 14 2008, 02:55PM

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

My audio modulator has the same volume-to-ON-time function. It works with all kinds of audio signals, not just a specially made waveform. Having said that, it doesn't seem to do much beyond letting me use the volume knob on my guitar to control spark length

I used some fairly simple analog circuitry. A precision rectifier to detect the envelope of the audio signal, feeding the control voltage pin of a 555 triggered by the audio waveform's zero crossings. If I remember right, I used a 555, a TL074, a 4011, and a couple of transistors, all running off a 9v battery and connected to the DRSSTC's interrupter input with a fibre optic link.

I think Dan's Xenosonic has the same function, although I haven't looked to see how he implemented it.

So yeah, basically I think it's a good idea :) Especially the idea of using a custom waveform to "program" the spark display, it's almost like the Youscope.

Reaching

Tue Jul 15 2008, 11:56AM

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

Finished the modulator.

it is really worth the effort 3 days of development. i added a smal additional pcb to limit the on time to a maximum adjustable value. so even when a pulse with a full range voltage is applied, the on time can be limited to whatever you want. so you can adjust the peak on time for maximum voltage. it works really good.. fibre optic output is onboard and of course a analog out and a connector for some sort of earplug to check the behaviour before connecting t a drsstc or so.

now its time to put it in a nice case with some bright leds and switches etc :)

Ken M.

Wed Jul 16 2008, 01:01AM

Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628

Very nice And I was even gonna start trying to figure out how to limit on time for my Tc also, you wouldn't happen to mind sharing the Audio and Limiter schematic would you?

Reaching

Sat Jul 19 2008, 07:24PM

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

Okay,.

Finished the modulator today and added some extra stuff.

the modulator has some nice specs, such as

active on time limit, adjustable from 100 to 520ÂµS
active off time limit for a minimum of 1mS between each pulse
full voltage controlled
on time is controlled via input signal voltage. resolution of 128 steps/1V a4ÂµS
signal compatible to square, saw, sine and some other waveforms.
on time controllable via computer, such as any other control value
compatible to hall, delay, distort phase, flanger vocoder and reeverb effects
microfone compatible. (Yes, with a mic preamp you are able to control your drsstc with a microfone!)
compatible to any musical equipment, such as e guitar or keyboard.
able to modulate from a whole lot of audiosignals
internal test oscillator to use it as a "normal" interrupter
optical output
analog output
3,5mm output for headphone
chinch input

what do you want more?

im not sure, if i should add the shematic here, but people who are interested can pm me and i can send them the shematic. but be aware, its not a simple circuit.

its easy to adjust though. just one precision pot to adjust the amplifiing factor of the preamp to adjust the moulator for your needs..

if a frequency is applied, that is higher than the maximum of 1khz, then the modulator divides this frequency by2 to reach the lower octave. if this is not enough and the frequency gets even higher, then the signal is divided by 4 if the divide by 2 signal has a off time smaller then 1ms in between each pulse. the pot on the front is for the maximum on time. since the on time is voltage controlled, this pot is for the limiter. you can adjust it for the maximum on time you want to from 100 to 520ÂµS. even when a signal with full voltage is applied to the input, the on time cant get higher than the maximum you adjusted it for. Its totally bulletproof. you cannot wreck your drsstc even if you are trying to apply 10khz.. you can plug your ipod in and play metallica friom realsound! hrhr, thats all possible. E-Guitar sounds are perfect with this modulator

Ken M.

Sun Jul 20 2008, 05:33PM

Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628

Very impressive, looking forward to a video of the Drsstc with the audio mod.

Reaching

Sat Jul 26 2008, 06:54PM

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

Heres a small documentation i wrote for those, who want to rebuild the mod or order pcbs from me. its in german though, but the scopeshots speak for themselves.

i can say, that this is the safest modulator ever build, cause it has some serious protection circuits on board.
you can modulate most everything with it from normal music to midi. the new feature and by far the best, is the active ocatve detection. the max modulate able frequency is 1khz. every signal or part of signal which is higher than 1khz in frequency will be divided by 2 or by 4 to reach the lower octave. the sound and thus the song sounds not "wrong" in this case, but is lowered 1 octave or 2 or whatever. this feature is very useful to protect your drsstc from overcurrent and trippin breakers. its a great noise filter too. if the input frequency is getting above 5 khz, the output shuts down

the next version of this modulator will be suited with a 2 stage parametric eq where you can set the "lower" and "upper" frequency spectrum, to point out the frequency range within a normal wav song to be modulated. with this feature, the modulator will be able to filter a guitar or keyboard melody out of a normal song, or even the voice, and use it as the source.

the docu shows some very basic waveforms. i dont have a digital scope to make good shots from realsound modulation, but the drsstc is on its way and will show the capabilities of the new modulator.
interesting shots in the pdf are showing the octave feature-

Reaching

Sun Aug 03 2008, 05:44PM

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

Some new infos.

Finished the primary today, made with 8mm copper tubing. inductance of 23,1ÂµH.

Bridge is neraly finished, so everything comes together

The 12 led ocd display is finished and tested and works great. now theres only some wiring to do and some other small things, and of course, winding the secondary coil and building the toroid.

Reaching

Wed Aug 06 2008, 05:03PM

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

Started wiring and assembly today. oh man, this project takes months to finish and huge amounts of money too. that will be the first and last drsstc with complete optical connections.

Tom540

Wed Aug 06 2008, 05:36PM

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

Reaching wrote ...

Started wiring and assembly today. oh man, this project takes months to finish and huge amounts of money too. that will be the first and last drsstc with complete optical connections.

Yeah I don't blame you look at how fat those fiber cables are, sheesh. This is why I'm going to be cramming everything on one PCB from now on. No more modular designs.

Ken M.

Thu Aug 07 2008, 12:39AM

Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628

Wow very impressive! I like the layout, plus the well lined wires. Very Nice, now we just need sparks. Kepp it up.

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