[sdiy] single 9 volt battery white noise source

[Dave Leith]

Hi Sam

yes, very cool. Thanks. It will be worth trying.

What I ended up doing was a bit of a kludge. I used aero's
recommendation, added an extra gain stage then added 3 AA cells (they
were thin enough to fit in box space) to bring the voltage up to 12.5V
for only the noise section. I just used parts I had on hand which were
2N3904's. The 3904s had stopped making enough noise somewhere around 8
volts.

Dave

On 7/18/09, HOSHUYAMA <houshu at muj.biglobe.ne.jp> wrote:
> Hello Dave,
>
>  If you are not strict on the spectrum of the noise,
>  my very simple noise source can be used.
>
>  Simple Noise Generator Using TL431
>  http://houshu.at.webry.info/200901/article_1.html
>
>  The blog is in japanese, but, the schematic will be understandable.
>  When the voltage swing of 50mVpp is not large enough for your application,
>  you have only to add another amplifier, which can be used for filtering.
>
>  Sam HOSHUYAMA
>  Saitama, JAPAN
>
>
>  Dave Leith wrote:
>  > The noise is driving either the distortion or FM input of the XR2206
>  > VCO so probably something very simple/passive.
>  >
>