Re: White noise generator


"John Larkin" <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:t6k0r1lbkip5hbs72jtdllmv00kad3ifc6@xxxxxxxxxx
> On Tue, 27 Dec 2005 09:03:21 +1300, "Roger Dewhurst"
> <dewhurst@xxxxxxxxxx> wrote:
>
> >I would be grateful for suggestions on constructing a simple random noise
> >generator. Most of the noise should be within the audio spectrum.
> >
> >R
> >
>
> Radio Shack sells a little amplified-speaker box, $9 or something.
> It's very noisy, and should output a reasonable amount of noise via
> the headphone jack. I can't vouch for its statistics.
>
> The more formal way to do this would be to bias a low-power 10-volt
> zener to maybe 1 mA current, and amplify that. Figure the zener will
> make roughly 300 nV/rootHz noise density, or about 40 microvolts RMS
> in the audio KHz range.
>
> You can also make noise digitally, with a pseudo-random shift
> register. See AoE.
>
>
> John

Thanks. Radioshack stuff is unavailable for me. The second option is more
in line with what I anticipated. Will one operational amplifier be
sufficient? I am not interested in the quality of the noise but merely
getting sufficient to drive a small speaker fairly hard.

Roger.
>


.

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