[sdiy] Pseudo Random Noise Generator in an AVR?

[Needham, Alan]

Maybe the noise source on Electric Druid's website could be useful...
http://www.electricdruid.net/index.php?page=projects.noisegen
OK, it's a PIC rather than an Atmel, but for reference he runs at 90kHz.
I haven't tried it out yet but have heard good things of it.


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Jim Patchell
Sent: 09 January 2013 05:11
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] Pseudo Random Noise Generator in an AVR?

I am trying to elimnate parts in my current project.  I have every thing 
on the board, except the analog noise generator (you know, reversed 
biased e-b junction.  Gaining enough realestate may not be possible, and 
I don't want to add any more square inches.  So, I was thinking, why not 
move the noise generator into the ATmega that is also on the board.  
Making a 32 bit linear feedback shift register in the firmware should 
not be a problem.  Running it fast enough might be  I would want to run 
it at a minimum of 40K shifts per second.  Not even sure if that is fast 
enough.

Anybody else every try something like this, and how did it work. 
Otherwise, I am going to have to break out the old STK500/501 and write 
some code. ;^)

-Jim

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