MyCo Posted November 16, 2008 Report Share Posted November 16, 2008 I've been working on my version of an AVR Synth. Now it looks like this:The only addition to get it running is a power supply, I've built my own:Total investment: 16 Euro and ~100 hours til nowThe AVR is an Atmega644 running at 20MHz (the crystal and its caps are under the chip), so now I've 64kB of Flash memory and I use 16kB of it for a wavetable. At the moment it sounds like nothing. I'll come back when I've got something to listen to it ;) Quote Link to comment Share on other sites More sharing options...
jimh54 Posted November 17, 2008 Report Share Posted November 17, 2008 Very cool!! I've been thinking of building one of these but don't want to spend the $ for the kit from Elby Designs. Are you planning on posting schematics, code etc? If so I'd really be pleased. Elby doesn't provide the schematics to my knowledge. What are you using to program the processor? Quote Link to comment Share on other sites More sharing options...
MyCo Posted November 17, 2008 Author Report Share Posted November 17, 2008 Yes, I make it open source. But at the moment I don't have a schematic, because it is so simple, that I draw the connections directly in a PCB-Layout programm before I built it :)To program the AVR, I use an In-System-Programmer (Flat cable on the left) with PonyProg, and AVR Studio 4 to write/compile the Assembler. All of this parts are Open Source / Freeware, too. Quote Link to comment Share on other sites More sharing options...
MyCo Posted November 20, 2008 Author Report Share Posted November 20, 2008 So, here is the first preview. I've finished my first attempt to build in a filter...http://yedey.com/other/filtertest.mp3It demonstrates the filter (cutoff & resonance) and wave morphing from saw to square. It already has 7 different waveforms and it can morph between all major waveforms (sine, saw,square triangle). The filter introduces a lot of noise, which I tried to kill in the DAW. Quote Link to comment Share on other sites More sharing options...
curve Posted November 20, 2008 Report Share Posted November 20, 2008 Sounds very cool!! :DWould be nice to have such a thing.. :) Quote Link to comment Share on other sites More sharing options...
bugfight Posted November 20, 2008 Report Share Posted November 20, 2008 nice. esp with the saw Quote Link to comment Share on other sites More sharing options...
Twin-X Posted November 20, 2008 Report Share Posted November 20, 2008 Wow that sounds great. I will be following this.Keep it up!!! 8) Quote Link to comment Share on other sites More sharing options...
stryd_one Posted November 21, 2008 Report Share Posted November 21, 2008 The filter introduces a lot of noise, which I tried to kill in the DAW.Can we hear it minus the PC? Not all of us use a DAW for audio processing ;) Quote Link to comment Share on other sites More sharing options...
MyCo Posted November 21, 2008 Author Report Share Posted November 21, 2008 ok, here is the version without postprocessing (except normalization):http://yedey.com/other/filtertest_org.mp320% of the noise in there is from my PC (I use the soundcard from the mainboard, which is noisy)the other 80% are from the synth.I found out, that most of the synth noise comes from the midi input, that means, as soon as I send a midi message, I can hear a noise. The clip above uses 3 automations, so there are a lot of midi messages which generate a lot of the noise. I think I've to put some more capacitors on the board to filter the voltage drops of midi in optocoupler... Quote Link to comment Share on other sites More sharing options...
stryd_one Posted November 22, 2008 Report Share Posted November 22, 2008 Had a listen, still way too much going on there to analyse the filter's behaviour :(Sounds fun tho... Quote Link to comment Share on other sites More sharing options...
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