Search found 215 matches

by ricko
Sat May 23, 2020 2:17 am
Forum: Modular Synth General Discussion
Topic: Donald Tillman "Palette of Static Waveforms"
Replies: 33
Views: 676

Re: Donald Tillman "Palette of Static Waveforms"

One thing sorely lacking in most synthesizers is a simple, preferably voltage controlled crossfade between waveforms instead of the manual mix. Sergio Franco designed this for the (1960s) SalMar Construction, calling it a SeeSaw. IIRC using a CA3054 diode array. It is a good name. There are also ot...
by ricko
Fri May 22, 2020 9:46 am
Forum: Modular Synth General Discussion
Topic: Donald Tillman "Palette of Static Waveforms"
Replies: 33
Views: 676

Re: Donald Tillman "Palette of Static Waveforms"

I don't want to discredit Don. I think he does good work. I wouldn't want him to stop publishing articles. but I think he fills the role that Steven Hawking did. Gosh Don, you are only a popularizer like that simplistic hack Steven Hawking! I am trying to remember a post where the writer was simult...
by ricko
Fri May 22, 2020 8:28 am
Forum: Modular Synth General Discussion
Topic: Donald Tillman "Palette of Static Waveforms"
Replies: 33
Views: 676

Re: Donald Tillman "Palette of Static Waveforms"

If you look closely you'll see that the eventooth waveform has four zero-crossings per cycle. That said, I don't see how it's an issue as our sense of hearing cannot actually detect zero-crossings. "Aligned phases" is a very nice feature for audio signals. It means that when you mix waveforms toget...
by ricko
Tue May 19, 2020 11:16 pm
Forum: Modular Synth General Discussion
Topic: Donald Tillman "Palette of Static Waveforms"
Replies: 33
Views: 676

Re: Donald Tillman "Palette of Static Waveforms"

Eventooth is a doubly frequency saw plus a sine. So you can construct thus as something like sine + saw - square You can construct the even angle from sine + parabola - tri But note that the phases of the waves need to be as the diagram shows. So the only new primary shape you need is the parabola. ...
by ricko
Wed May 13, 2020 5:54 pm
Forum: Music Tech DIY
Topic: Perfboards, Veroboards, Breadboards, Oh My
Replies: 33
Views: 563

Re: Perfboards, Veroboards, Breadboards, Oh My

I pretty much gave up on perfboard and veroboard etc. I dont see that prototyping is very effective or efficient, nowadays. I simulate the circuit first (in a SPICE system, namely TI-TINA) if novel then I get a PCB made, and jiggle the values if necessary in that. (If it is an established design, no...
by ricko
Wed May 13, 2020 10:24 am
Forum: Modular Synth General Discussion
Topic: What module will add a specified voltage at each trigger?
Replies: 12
Views: 352

Re: What module will add a specified voltage at each trigger?

Or an AR EG going through a clocked S&H, timed to give the appropriate division.
by ricko
Wed May 13, 2020 10:22 am
Forum: Modular Synth General Discussion
Topic: What module will add a specified voltage at each trigger?
Replies: 12
Views: 352

Re: What module will add a specified voltage at each trigger?

Two sequencers? An16-step one A where each step is tuned 1V above the previous, (e.g -7 to +8) and a second 16 step one B that also increments by 1V.

The main click triggers A. The reset pulse of A triggers B as well as resetting A. The outputs are scaled and summed (.08 A + 1.28 B)
by ricko
Wed May 13, 2020 10:05 am
Forum: Modular Synth General Discussion
Topic: Finite state machine module - FSM?
Replies: 16
Views: 412

Re: Finite state machine module - FSM?

You can create flip-flops from the logic gates, and counters from flip-flips, etc.

https://www.electronics-tutorials.ws/se ... flops.html

But yes, you could also provide counters and various kinds of multivibrators durectly, to save on patching complexity.
by ricko
Wed May 13, 2020 9:58 am
Forum: Modular Synth General Discussion
Topic: Strings and saw waves
Replies: 55
Views: 866

Re: Strings and saw waves: resonance tuned to arpeggio

To simulate that, ideally you might mix the outputs of several typical synth filters at different frequencies with significant resonance. Another idea might be to use a fixed filter bank or graphic equalizer; and a third, to try to do "waveguide" synthesis with a few short delay lines and feedback ...
by ricko
Wed May 13, 2020 3:38 am
Forum: Modular Synth General Discussion
Topic: Finite state machine module - FSM?
Replies: 16
Views: 412

Re: Finite state machine module - FSM?

There is indeed a long history of patch-configurable state machines: it is called a "logic lab" or "logic trainer". Gates, clocks, switches. https://www.smecc.org/video/logic_5.gif https://i.pinimg.com/originals/4c/93/4e/4c934e8d463f10a4bd23910b7d181576.jpg (The reason that these are generally not a...
by ricko
Wed May 13, 2020 3:25 am
Forum: Modular Synth General Discussion
Topic: Function generator
Replies: 33
Views: 1127

Re: Function generator

For Function Generator, there are three quite different usages: * Analog Computers used Function Generator to mean some transformation module (transfer function): e.g. a Log generator, a diode function generator (squaring, for example). See http://www.bitsavers.org/pdf/eai/tr-48/EAI_TR-48_Analog_Com...
by ricko
Tue May 12, 2020 10:39 am
Forum: Modular Synth General Discussion
Topic: waveshaper
Replies: 18
Views: 599

Re: waveshaper

MindMachine wrote:
Fri May 08, 2020 11:42 pm
Nice info. I thought the OP was asking about wave shapers?
Yes, waveshapers not Waveshapers (Triple) as such. OP mentioned a rectifier as a possibility in the initial post, so clearly she or he is interested in things that shape waves rather than the Serge rehashes only.

Regards
Rick
by ricko
Tue May 12, 2020 10:16 am
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Rotational Phase CV

Well, representing *much* more than 360 degrees is kinda the point: rotational phase rather than merely angular phase (where 1V = 45 degrees would certainly be feasible.) We need to be able to go beyond 360 without too much worry that we will run out of phase. If we had 1V = 45 degrees then it would...
by ricko
Tue May 12, 2020 9:52 am
Forum: Modular Synth General Discussion
Topic: Strings and saw waves
Replies: 55
Views: 866

Re: Strings and saw waves

Whilst it’s useful to visualise the process of horsehair gripping string etc etc, that isn’t really relevant to the wave shape, and isn’t a process that repeats x100 times a second through the course of the note. Interestingly, as well as this saw/tri motion from the bow, there is also a rotational...
by ricko
Thu May 07, 2020 8:37 pm
Forum: Modular Synth General Discussion
Topic: waveshaper
Replies: 18
Views: 599

Re: waveshaper

If you use guitar pedals and an adapter for send/receive, then you can use a spare VCA + AR EG as a noise gate (fastest attack, slow release) on the returned signal. On the topic of Wavefolders, John Schussler has made a couple of nice YouTube videos demonstrating lots of different wavefolder module...
by ricko
Thu May 07, 2020 8:19 pm
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Rotational Phase CV

An lm3914 implementation would be in bar mpde, not dot mode, so the overlap should not be an issue. However, the sharpness of the on/off transition is important: you need as clean a break as possible.

Maybe a 3bit audio DAC with fast settling might be a better implementation.

Ricko
by ricko
Thu May 07, 2020 11:03 am
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Phase CV

Yes, Rasp (which was designed as a waveshaper, not a general phase converter) does have a pot for bias (to take the input into 0 to +ve range where the sawtooth doublers operate) and a pot for level going into the chain of sawtooth doublers. Where this is deficient for rotational phase conversion is...
by ricko
Wed May 06, 2020 11:33 pm
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Phase CV

I get that most people ard not analytical: we want to plug things in a hear the sounds they make. And I get that people have never even considered the idea of CVs for rotational phase rather than angular phase: so most of the comments are about angular phase. And I get that it is goid enough if ever...
by ricko
Tue May 05, 2020 8:10 pm
Forum: Modular Synth General Discussion
Topic: waveshaper
Replies: 18
Views: 599

Re: waveshaper

I think there are two kinds of waveshapers: those designed based on abstract engineering/geometric considerations, and those designed based on actual musical/physical considerations. A neat technical manipulation does not necessarily make a module with much musical aptitude. The Wavolver (I have and...
by ricko
Tue May 05, 2020 10:19 am
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Phase CV

I guess I am not still making myself remotely clearly. Let me try to express it another way. VCOs provide inputs with unstandardized DIY scaling (mod inputs, mod knobs) AND standardized inputs (1V / 8ve). They provide the latter, even though it is refundant, because of the benefits: convenience, pre...
by ricko
Tue Apr 28, 2020 11:33 am
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Phase CV

I must be explaining myself really badly: I don't see how you could read that in my opening post. Sorry. 1) There a variation in VCO sawtooth output levels between modules. 2) This is a noticeable problem for me, because I have waveshapers that operate on saws in a level sensitive way. 3) I realized...
by ricko
Tue Apr 28, 2020 11:01 am
Forum: Music Tech DIY
Topic: How does this ADSR circuit work?
Replies: 10
Views: 306

Re: How does this ADSR circuit work?

I agree that you are better off finding an existing circuit: this one is too complex. I think you are seeking the integrator capacitor. I believe that is C1, which is in the feedback loop of U2 on the far right. Like most envelope generators have four parts: 1) a logic sequencer that switches 2) var...
by ricko
Mon Apr 27, 2020 4:08 am
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Phase CV

Some more datapoints, for anyone interested. I went to ModularGrid, Oscillator, most popular, then the analog (as dar as I coukd see) VCO modules with saw out. By popularity: #1 STO DPO. Sawtooth 9V pp, according to their manual. #2 Intellijell Dixie 2+. No info #3 Intellijel Dixie no info (see http...
by ricko
Mon Apr 27, 2020 3:20 am
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Phase CV

Now you have really lost me. First you say my premise is in error because everyone who is anyone uses 10V pp. Now you say my premise is flawed no matter if there is a good deal of variation in signal levels. I don't see how you can say A being false proves B which relied on A being true.
by ricko
Mon Apr 27, 2020 12:21 am
Forum: Modular Synth General Discussion
Topic: Towards a "standard" convention for Rotational Phase CV
Replies: 35
Views: 827

Re: Towards a "standard" convention for Phase CV

(I disagree that 10V pp is a reliably ubiquitous or exact output level for saw waves on arbitrary Eurorack VCOs.I dont think you can just dismiss Doepfer like that.) While I get it that +/-5V would be convenient, it has the shortcoming that for Eurorack it only gives you -252 to +612 degrees range a...

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