Joined: Jan 17, 2010 Posts: 193 Location: ithaca, new york
Posted: Wed Mar 09, 2011 6:44 am Post subject:
Boogdish wrote:
It's two chips, a 16F913 PIC and a quad op amp being used as an output buffer and voltage summer/limiter of the time CV. I'm sure it could be done using standard CMOS chips, but for me, it's easier to figure it out with a PIC.
I'm thinking about starting over with it and have the PIC read the values of the pots then output with the PWM or a standalone DAC. That way the PIC could do the filtering of between step voltages and have smoother transitions. I think I'd also have try having separate time controls for A/S/R.
Thanks for the explanation. You could easily do most of that stuff with a 4017, but some of the cooler functions, like being able to pingpong back and forth between two points defined by switches would be trickier and probably not doable with only two chips, so it seems like a great use of a microcontroller. It would make a pretty cool "standard" sequencer as well, it has some features that seem useful which are uncommon to see in the 10 and 16 step analog sequencer designs i am used to. I want one!
Joined: Jan 14, 2010 Posts: 5825 Location: Moon Base
Audio files: 709
Posted: Wed Mar 09, 2011 12:00 pm Post subject:
Purle Star 555 Subject description: Dr Steve's 555 Circuit modded by PHOBoS
I finally got the last parts to finish this thing, the knobs!
It's a noise/sound generator with 2 NE555 chips, original design by
Dr. Steve with some modifications by me.
Joined: Jan 14, 2010 Posts: 5825 Location: Moon Base
Audio files: 709
Posted: Wed Mar 09, 2011 12:08 pm Post subject:
jordroid wrote:
You could easily do most of that stuff with a 4017, but some of the cooler functions, like being able to pingpong back and forth between two points defined by switches would be trickier and probably not doable with only two chips
actually that might not be that hard. I just happened to come across this video today.
Using 2 4017 chips to create a bounce effect (one chip for each direction)
so that might be a start. Though microcontrollers are of course an 'easier'
way and more versatile.
And Boogdish, really like your work. That looks like a great functional piece of kit. _________________ There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
Hunter S. Thompson movies noise
Joined: Jan 17, 2010 Posts: 193 Location: ithaca, new york
Posted: Sat Mar 12, 2011 7:10 am Post subject:
PHOBoS wrote:
jordroid wrote:
You could easily do most of that stuff with a 4017, but some of the cooler functions, like being able to pingpong back and forth between two points defined by switches would be trickier and probably not doable with only two chips
actually that might not be that hard. I just happened to come across this video today.
Using 2 4017 chips to create a bounce effect (one chip for each direction)
so that might be a start. Though microcontrollers are of course an 'easier'
way and more versatile.
I really like that envelope generator btw, and the LEDs in the slidepots look
great!
Ah, but the trick of pingponging back and forth between any two steps as selected by switches is still going to be tricky, i don't know a way to make a 4017 reset to anything but output 0? Nice 555 machine btw!
Joined: Jan 17, 2010 Posts: 193 Location: ithaca, new york
Posted: Thu Mar 17, 2011 6:07 am Post subject:
Not quite "finished" finished, but i reached a milestone on a pre-patched synth i am working on, panel wiring is finished as of last night! All that is left is to chase any remaining gremlins out (shouldn't be too bad, most everything is tested and calibrated), make a proper panel and box it up.
Contains one Ian Fritz saw core VCO as described in an EM thread, with standard tri, sine and pulse shapers, plus a Fritz 5 pulser and two Scott Stites "wave things". Your basic three octave 11 waveform VCO
One Ian Fritz Teezer through zero VCO, holey moley is that thing amazing.
Four Thomas Henry VCAs.
One Ian Fritz Threeler multi mode VCF.
One transformer/diode ring modulator, Ken Stone style.
Four simple LFOs, one Tom Wiltshire/Electric Druid tap LFO.
Three Tom Wiltshire ADSRs.
Two 4017 sequencers, one 4013 divide by 2 and one 4017 divide by 1-8. Sequencers can be mixed together with one running off a divided clock (divided by 1-16) or run independently.
The sequencer clock is a falling ramp/comparator set up with VC gate width, thanks for the great idea Fonik!
Two Boogdish pic quantizers.
Two simple glide circuits, portamento can be applied before or after quantization.
A single buss 1v/oct keyboard controller.
Circuits are from Ian Fritz, Thomas Henry, Scott Stites, Ken Stone, Tom Wiltshire, Ray Wilson, Michael Barton and Bernie Hutchins/electronotes contributers, thanks guys, i promise to have way too much fun
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Hi, I completed this morning the troubleshooting of my Toppobrillo Dual 281 FG module. The problem was caused by mounting the lm7810 backwards. I think it caused the failure of 1 cd4001 (the one for section A, section B worked from the very beginning). I like troubleshooting! Especially when it makes something work!
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I have recently finished my first modular synth. It is only Yusynth modules + one ACX Midi 2 CV interface, one Formant Intrument Interface and a Deepsea active multiple (those ones are on the upper and lower left side).
PSU is a CGS66 heavily modded and built on perfboard.
Thanks a lot to Yves Usson and all the people who helped me to finish this build.
Thanks also to AndrewF for helping me finding those big colored knobs
Joined: Mar 28, 2006 Posts: 1430 Location: Kansas City, Mo USA
Audio files: 45
Posted: Fri Mar 18, 2011 11:41 am Post subject:
mph wrote:
I have recently finished my first modular synth. It is only Yusynth modules + one ACX Midi 2 CV interface, one Formant Intrument Interface and a Deepsea active multiple (those ones are on the upper and lower left side).
Congratulations. Nice looking synthesizer with a nice set of modules. Enjoy! _________________ -- Kevin http://kevinkissinger.com
Not quite "finished" finished, but i reached a milestone on a pre-patched synth i am working on, panel wiring is finished as of last night! All that is left is to chase any remaining gremlins out (shouldn't be too bad, most everything is tested and calibrated), make a proper panel and box it up.
Contains one Ian Fritz saw core VCO as described in an EM thread, with standard tri, sine and pulse shapers, plus a Fritz 5 pulser and two Scott Stites "wave things". Your basic three octave 11 waveform VCO
One Ian Fritz Teezer through zero VCO, holey moley is that thing amazing.
Four Thomas Henry VCAs.
One Ian Fritz Threeler multi mode VCF.
One transformer/diode ring modulator, Ken Stone style.
Four simple LFOs, one Tom Wiltshire/Electric Druid tap LFO.
Three Tom Wiltshire ADSRs.
Two 4017 sequencers, one 4013 divide by 2 and one 4017 divide by 1-8. Sequencers can be mixed together with one running off a divided clock (divided by 1-16) or run independently.
The sequencer clock is a falling ramp/comparator set up with VC gate width, thanks for the great idea Fonik!
Two Boogdish pic quantizers.
Two simple glide circuits, portamento can be applied before or after quantization.
A single buss 1v/oct keyboard controller.
Circuits are from Ian Fritz, Thomas Henry, Scott Stites, Ken Stone, Tom Wiltshire, Ray Wilson, Michael Barton and Bernie Hutchins/electronotes contributers, thanks guys, i promise to have way too much fun
Joined: Mar 28, 2006 Posts: 1430 Location: Kansas City, Mo USA
Audio files: 45
Posted: Thu Mar 31, 2011 9:30 pm Post subject:
A redesign and new functions for a double-width module
While I liked my Modulo Magic module, I was never satisfied with my initial panel layout -- it was overly cluttered with inputs and controls that proved to be redundant.
Through experimentation I discovered that to add a VCA input section and a bias shifter increases the Modulo Magic's capabilities.
The VCA accepts both a/c and d/c inputs and can be used stand-alone. It sends it's output to a self-designed bias shifter circuit that I defaulted to a +5v bias -- the bias level can be shifted by an external voltage.
The modulo magic accepts that shifted signal as well as an auxiliary signal. I renamed the functions to: Threshold, Range, and Step Size -- these all can be voltage controlled.
I originally built Modulo Magic as a control voltage processor however I really like it as an audio signal processor. Thus, I optimized the front panel control ranges and the functions for audio (though it works fine as a control voltage processor, too).
This redesign required 1 1/2 module spaces so I added a Yusynth Dual Gated Slew which takes up the other 1/2 module space.
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The redesigned and expanded panel.
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View of the PCBs. The three PCBs are the CGS Modulo Magic, a board that contains the Yusynth VCA and my own bias shifter, and the Yusynth Dual Gated Slew PCB.
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Joined: Feb 11, 2011 Posts: 113 Location: Bulgaria
Posted: Thu Mar 31, 2011 10:52 pm Post subject:
Your builds make me sad, people. I don't think I'll ever have the time and resources to build something like this, even if I had the skills and knowledge.
Any chance of a schematic for the Polyrhythm generator? That's something relatively simple and definitely usable.
mph, any info on that "Formant Instrument Interface"? Google gives nothing.
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