[sdiy] White noise

[Scott Gravenhorst]

Sounds like a job for CMOS:

Here is a 24 bit psuedo noise generator:
http://home1.gte.net/res0658s/fatman/vcngfig3.gif

Here is a list of tap points for shift registers up to 168 bits.
http://home1.gte.net/res0658s/electronics/LFSRtaps.html

These things are simple and can be made with 4xxx series parts and will run
on any voltage from 3 to 15.  The clock input is just that, it can come
from a VCO (square or pulse output) as it does in my case or it can be a
simple fixed frequency clock that you can make from 2 inverters, 2
resistors and a cap.


Rafael_Cohen at prusec.com wrote:
>
>Hey y'all,
>
>I am looking for simple white noise generating circuits that can run off a
>9V battery.  Dave Wright suggested the Old Crows PIC noise source, but I
>have no PIC burner, and I don't need one that is partiularly loud.  Also,
>he mentioned the Thomas Henry "Noise Generator Cookbook" but since Midwest
>Analog disappeared, I don't know of a source for those books anymore.
>Anyone know of any interesting schematics or a source for the TH book?
>
>Thanks,
>
>Rafael
>

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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