[sdiy] Vote for your favorite noise source

[René Schmitz]

My favourite is the pseudo random shift register. 
25bit (4015 + 4006) For a continuous output I have 
fed the eight taps from the 4015 into a weighted summing 
stage. A kind of digital filter, that derrives an output 
dependant of the number of ones in that portion of 
the shift register. 

There is also a nice circuit in the Art of Electronics,
(Laboratory noise generator) that implements a 32-order
low pass filter, which should give a good smooth 
gaussian distribution. 

I think the 3db/oct filtering for pink noise could also 
be implemented with digital filtering.

Cheers,
 René

At 01:25 13.05.02 -0700, Tim Ressel wrote:
>Okay boys and girls, Its time to throw caution to the
>wind and start a new holy war:
>
>Part 1:
>
>(*)-(*)-(*)-(*)-(*)-(*)-(*)-(*)
>Which Noise Source Is The Best?
>(*)-(*)-(*)-(*)-(*)-(*)-(*)-(*)
>
>
>Candidates:
>
>Reversed-biased PN junstion (2N2712)
>Above with constant-current source
>Reversed-biased zener
>Dual reversed-biased zener (MOTM??)
>Mondo shift register with feedback
>Small hungry infant
>Other?
>
>
>Part 2:
>
>(*)-(*)-(*)-(*)-(*)-(*)-(*)-(*)
>Which Pink Filter Is The Best ?
>(*)-(*)-(*)-(*)-(*)-(*)-(*)-(*)
>
>
>Have fun!
>
>--TR
>
>
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-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159