[sdiy] Noise Engine Progress

[Tim Parkhurst]

On 9/26/05, Michael Ruberto <frankentron at hotmail.com> wrote:
>
> White noise and plenty of it. After experimenting with a handful of
> different transistors I found the all-time king monster of noise makers -
> ECG128. This TO-39 brute just pumps out the noise. Initially I was using
> 2n3904 and the loudest of the batch still required a 1st stage gain of 136
> +
> 2nd stage gain of 3 which got me almost 1V PP. I stuck the ECG128 in and
> nearly blew my speakers out! Now 1st stage gain is only 9.2 and 2nd stage
> gain 3 for a output of over 5V PP. It's great, less gain more noise with
> that same refreshing taste.
>
> I could not find a pink noise filter I liked out of all my schematics. So
> I
> started playing with comparators for digital noise. Best sounding I got
> here
> is to send WN to comparator 1 and inverted WN to comparator 2. Setup a
> divider for each so they trigger about .75V apart. Then AND the outputs
> together with diodes. It sounds VERY crunchy. I think I'm calling it Dirty
> Noise. It will convert to a nice sounding pink noise with one .022uF cap
> from the output to ground.
>
> I'll get some schematics drawn tomorrow.
>
> M. A. Ruberto
>
>
>
Hey Michael,
 You definitely should check out Ray Wilson's "Multi Noise and Random
Gate/Trigger Generator." Uses some of the same tricks you mentioned for
'digital' noise. Also features "grainy noise" and "roaring noise."
 http://www.musicfromouterspace.com/analogsynth/multinoisemodule_exp.html
 Have fun, and let us know what you come up with!
 Tim (having way too much fun at work) Servo
--
"Imagination is more important than knowledge." - Albert Einstein
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