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 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
PIC-based fraktal synth
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State Machine
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PostPosted: Wed Mar 09, 2011 6:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Monokinetic said:

Quote:
Aha well there has been some interesting discussion that I almost missed out on. Bill the 2 PIC board with ICSP sounds super. I thought I could mention that I recently had a lot of fun sending 0-5v control signals from some basic Lunetta type LFOs into the PIC synth. Maybe your board could have patch points for the pot ins to accommodate also sending in such CVs?


Ahh, but of course, that is a fine idea and could easily "patch" over the potentiometers. Would just have to protect the MCU A/D inputs from anything above 5V but sounds like a nice idea.

Here is my list of things that are going to be sitting on top of this board:

(Fraktal 2x) Synthesizer PCB Ideas


(2) MCU's for Double the Fraktal FUn !

Prototype area

Line level pair (L/R) & standard modular 10V P-P pair (L/R) audio outputs.

(2) Onboard 1W audio amplifiers (left and right channel amplifiers).

(2) 6 pin ICSP programming male header for each PIC chip (For PICKit Programmers)

(2) 6 Pin RJ11 modular programming connectors for each PIC chip (For ICD 2 & 3 Programmers)

(2) analog 2 Pole State Variable Filters with electronically selectable Low Pass, Band Pass and High Pass mode with resonance control.

(2) Patchable "Multi Wave" LFO's

(2) Optionally installed PT2399 Delay processing chips for chorus and delay FX

MIX level between DRY, FILTERED, and optional PT2399 delay FX

PAN LEFT/RIGHT level for each synthesizer

Improved Output PWM filter by utilizing an active 2 pole, low pass filter with a 5 KHz cutoff to keep baseband PWM noise out of the audio chain. (original filter improvement in terms of placement of cutoff frequency and slope)

(*) Addition of BANK select logic for expansion to 16 banks of 16 patches for a total of 256 patches (currently there are 8 patches)

(*) SYNC OUTPUTS (5v or 10v output selectable)

(*) SYNC INPUTS (1.5v to 10v input level)

(*) For expansion

Here is one of the bread boards with the two main MCU chips on it.

Bill


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tazer



Joined: Oct 18, 2010
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PostPosted: Thu Mar 10, 2011 4:44 am    Post subject: Reply with quote  Mark this post and the followings unread

that is a serious bit of breadboarding there Bill!! Hail the Master
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monokinetic



Joined: Aug 01, 2006
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PostPosted: Fri Mar 11, 2011 1:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Bill, wow man you really have been busy I see Smile

I'm looking forward to this even more now. I guess we will need some firmware additions to cater for syncing two chips, is Yerpa working on that?

On another note, I got a reply from Catweazle and he very kindly said that he could provide all of the old fraktal synth demo files, we just need somewhere to host them....

Anyone have some server space? Maybe they could be linked to from Yerpa's fraktal synth page?

David
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State Machine
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PostPosted: Fri Mar 11, 2011 4:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi David

Quote:

Bill, wow man you really have been busy I see


Trying to be, yes ... Laughing I feel the need to be a productive citizen Wink

Quote:
I'm looking forward to this even more now. I guess we will need some firmware additions to cater for syncing two chips, is Yerpa working on that?


The hope is to release a schematic so that a standard "dual 18F processor version" hardware platform could be established so that folks could use if they wished to develop more patches. I specify the "18F" because I realize there has been talk of a DSPic version also.

I will also provide the Express PCB, PCB files if one wished to have them made but I will also have them available at low cost to anyone who wishes once completed.

I will probably break down and purchase the CCS Compiler (PCH52112-320, Command Line Version working under the MPLAB IDE) for $200.00 so that I could develop patches this board. To go the route of converting the syntax to the "C18" compiler is something I do not want to attempt nor have the time for.


Quote:
On another note, I got a reply from Catweazle and he very kindly said that he could provide all of the old fraktal synth demo files, we just need somewhere to host them....


Very nice, if anything, a simple BOX.NET area can be set up to DL them.

Bill
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JLS



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PostPosted: Sat Mar 12, 2011 11:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi all

This is my experiment and hardware modification Smile

- base is pic fraktal synth

- added delay PT2399

- and some analog modulation like semi-modular (all knobs and delay)

some sound examples soon !


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State Machine
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PostPosted: Sat Mar 12, 2011 12:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
This is my experiment and hardware modification Smile

- base is pic fraktal synth

- added delay PT2399

- and some analog modulation like semi-modular (all knobs and delay)


Oh NICE prototype example !!!! Would love to hear the PT2399 being fed by the synthesizer ! I have a few chips on the way. Cool

Can't wait for the samples.

Bill
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catweazle



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PostPosted: Wed Mar 16, 2011 4:37 pm    Post subject: Fraktalsynth for MaxMsp Reply with quote  Mark this post and the followings unread

cool stuff is going on here Smile
I'm working on a Fraktalsynth MaxMsp external.
It's working, same dirty sound as on PIC...

The NintendoDS Version is also available (if someone is interested mail me)


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catweazle



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PostPosted: Thu Mar 17, 2011 4:14 pm    Post subject: Fraktalsynth for NintendoDS Reply with quote  Mark this post and the followings unread

here is the NintendoDS Fraktalsynth (with Sourcecode)


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catweazle



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PostPosted: Thu Mar 17, 2011 7:03 pm    Post subject: Fraktalsynth Sample Reply with quote  Mark this post and the followings unread

some wired "melody" from the max-patch ... Smile


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Last edited by catweazle on Fri Mar 18, 2011 8:44 am; edited 1 time in total
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JLS



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PostPosted: Fri Mar 18, 2011 1:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Great work !

Many thanks your source code Smile

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yerpa58



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PostPosted: Fri Mar 18, 2011 1:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for posting again, catweazle! The source code for Nintendo looks interesting, especially the 12 db/oct filter. Any sound examples available to hear this filter?
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catweazle



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PostPosted: Fri Mar 18, 2011 4:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

@yerpa
the filter is "stolen" from a sourcecode for a C64 SID emulator for the NDS.
I have to look for my NDS and post some samples soon.

For those who haven't got a NintendoDS.
The .NDS file runs well in a emulator
http://www.nogba.com/no$gba-download.htm

Samples don't cover the whole range of possibilities ...
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JLS



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PostPosted: Sat Mar 26, 2011 7:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Little examples from my modification PIC Fraktal synth Smile

Base is basic chaos (Logistic equation) and PT2399 delay chip controlled from PIC

Pure sound - only normalize and fade !


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no modulation example

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modulation speed/pitch example

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Log-chaos-mod2.mp3
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delay modulation example

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delay and pitch modulation example

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some other modulation example

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_________________
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http://jlswbs.wordpress.com
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State Machine
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PostPosted: Sat Mar 26, 2011 12:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Little examples from my modification PIC Fraktal synth Smile

Base is basic chaos (Logistic equation) and PT2399 delay chip controlled from PIC

Pure sound - only normalize and fade !


I like these examples. The PT2399 really adds that "other worldly" dimension. Now I am really hyped to use these chip for my synthesizer.

Thanks for posting!
Bill
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yerpa58



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PostPosted: Mon Mar 28, 2011 12:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

@JLS: Nice samples, thanks for posting!
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MickSoFar



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PostPosted: Sun Aug 21, 2011 2:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

JLS wrote:
Little examples from my modification PIC Fraktal synth Smile

Base is basic chaos (Logistic equation) and PT2399 delay chip controlled from PIC

Pure sound - only normalize and fade !


Any details on how you do this?
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JLS



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PostPosted: Mon Aug 27, 2012 2:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi catweazle

Your nintendo fractal synth is very very interesting. Many thanks your source code. Very help me with my first teaching.

This is my first nintendo program about Chua oscillator with setting few parameters. This is first version my next teaching level is implementing sound.

Many thanks Kamil


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State Machine
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PostPosted: Sun Sep 02, 2012 7:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Here are a couple pictures of a dual Fractal Synthesizer on a vector board. The is will used as part of a DIY setup at this years electro-music 2012 electronic music festival. It will be a collaboration entitled "The Soldering Musician and the Personal Digital Assistants". The board contains the original speaker amplifier for stand alone operation when connected to speakers and also has an LM358 based , capacitive coupled, LINE amplifier/buffer to connect to an audio mixer.

The original dual version was on solderless breadboard and did not have the LINE amplifier. It appears earlier in this thread.

I particularly enjoy using the WSG and FM sequencer patches on this synthesizer. It's a fun synthesizer to play around with ! Cool

Next the PT delay chips shall be added.

Its been a LONG while since I revisited this but still have to purchase the CCS compiler to add patches.

Bill


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volare



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PostPosted: Fri Sep 07, 2012 3:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's a Picture of a fraktal synth I just breadboarded.The sounds are real cool.

Dave


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State Machine
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PostPosted: Sat Sep 22, 2012 7:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Here's a Picture of a fraktal synth I just breadboarded.The sounds are real cool.


Indeed ! Just very small amounts of input on the controls reveals some very unique changes in the sounds produced. You can experiment for hours ! Cool
I find that it's fun to play two of them and move each around in the stereo field.
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