Comments on: AVR Synth Part 1

By: admin

admin — Mon, 04 Jan 2010 07:33:45 +0000

Hi acidblue,

the project is finished!
there are 5 parts in the series:
http://www.synthfrog.com/general/2008/avr-synth-part-1/
http://www.synthfrog.com/general/2008/avr-synth-part-2/
http://www.synthfrog.com/general/2008/avr-synth-part-3/
http://www.synthfrog.com/general/2008/avr-synth-part-4/
http://www.synthfrog.com/general/2008/avr-synth-part-5-final/

and it continues to:
http://www.synthfrog.com/general/2008/an-avrsynth-16-layout/
http://www.synthfrog.com/general/2008/avrsynth-16-panel/
http://www.synthfrog.com/general/2009/avr-synth-re-re-packaged/

And it does sound quite good actually!

By: acidblue

acidblue — Sun, 03 Jan 2010 17:34:41 +0000

Hey there;
Did you ever finish this project?
Would love to see more.
Is there going to be a part 2 or 3?

By: Aris

Aris — Sat, 01 Nov 2008 22:30:00 +0000

http://rapidshare.com/files/159763564/AVRSynthPCB.V0.2.zip

New pcb, has 6N138 for midi in, midi out and a bit of a jumper cut down..

By: Aris

Aris — Sat, 01 Nov 2008 21:23:00 +0000

The 40pin header is the place where the switches are mounted.. (Sorry, didn’t write any comments

it is like having a switch between each of the 20 couples of pins.

So, you can divide it as much as you want (horizontally). A bit later I will upload a new PCB with the 6n138 as the optocoupler (this is what I have handy and it is sunday), and the missing midi out.

You can always mail me at akorbeti [at] gmail [dot] com

By: Collin Mel

Collin Mel — Sat, 01 Nov 2008 20:41:00 +0000

def does not “suck big time”! looks good – def usable as is.

yeah these repetitious connections are a freakin pain to lay out.

Hmmms, i may try breaking up the 40-pin header into 4 10-pin chunks. that might help avoid some of those jumpers – of course I’ll have to seee what it does first

By: Aris

Aris — Fri, 31 Oct 2008 22:30:00 +0000

Oh, and by the way, I forgot to put MIDI out.. (Will-do-tomorrow…..zzzZZZZ)

By: Aris

Aris — Fri, 31 Oct 2008 22:28:00 +0000

Okay, just remember that my PCB design skills SUCK BIG TIME!

In http://rapidshare.com/users/O5MTP0 there is a file called CPU.zip. It is a first version of the avrsynth (16/32) with lots of jumper wires (seen as TOP side wires (the red ones)). Collin, take a look if you like, I will etch it tomorrow. (And will post some photos too

By: Aris

Aris — Fri, 31 Oct 2008 19:32:00 +0000

Hmm I don’t think so. If you put the chips side by side you still have a problem Maybe editing the code to output the bits in the reverse order.. But hey, I’m gonna give it a shot with lots of jump wires

By: Collin Mel

Collin Mel — Fri, 31 Oct 2008 16:02:00 +0000

wait, could this be solved by editing the part layout in eagle?

By: Aris

Aris — Fri, 31 Oct 2008 12:41:00 +0000

It could be done I think but because the multiplexer’s pins were in the reverse order from the chip’s outputs I would have to make at least 16 + 2 jump wires on top.

I will try it today I think and post the board on the file repository.

You are most welcome to make any changes you may like..

(by repository, I mean http://sites.google.com/site/diysynth/)