[sdiy] Noisy white noise generator

[Ian Fritz]

At 03:04 AM 1/27/2007, Gorka Garcia wrote:
>I've built a soundlab minisynth from http://www.musicfromouterspace.com 
>and I am having some trouble with the white noise generator, I seem to be 
>getting low frequency noise from the LFO that lives in the same LF444. Do 
>you have any suggestions about what can I try to get rid of that LFO noise?


Gorka --

That's a fairly common problem with noise generator modules because of 
their high gain.  In my present unit I decouple the power for the 
transistor and first opamp using 3.3V Zeners and 22 uF caps.  I wouldn't 
share the high gain stage chip with any other circuit, i.e., use a single 
opamp.

   Ian