[sdiy] Truly white noise

[jeff brown]

> VC radio receiver would me a dream come true for me!  just the other day i
found this:
>
> http://www.aoc.nrao.edu/~pharden/hobby/Ahobby.html
>
> anybody ever done something along these lines?  even AM band would be
great--would this approach to voltage controlled capacitance work in a basic
am receiver?  should i start looking for my old crystal set?
>
A heterodyne type receiver using a VCO (albeit a high frequency one) will do
it. I'm sure there are schematics on the web...

An AM Short Wave receiver tuned to an unused band (somewhere between 20 and
21 MHz used to work, IIRC) is a good source of noise, but is also a good way
of detecting lightning strikes and periodic emissions from Jupiter (I'm NOT
making this up - it's been used by professional and amateur radio
astronomers),
not to mention sources of man-made noise.

Jeff Brown
www.guitarfool.com




>
> >----- ------- Original Message ------- -----
> >From: np at inverse-entertainment.de
> >To: synth-diy at dropmix.xs4all.nl
> >Sent: Fri, 25 Jun 2004 20:23:36
> >
> >synth at oldmail.charlielamm.com wrote:
> >
> >>I was wondering if any DIYer has used a FM tuner
> >or AM tuner as a noise
> >>source.  I believe there are fairly monolithic
> >IC's to do this so it could
> >>possibly be done with low parts count (or, you
> >could plug your home stereo
> >>into your synth, tuned between stations, but that
> >might be a bit
> >>inelegant?)
> >>
> >>
> >
> >Funny.. Half an hour ago I thought about a voltage
> >controlled shortwave
> >reciever myself. On shortwave you'll receive the
> >strangest stations, and
> >also the most interesting noise artifacts.,.. It
> >would be a one trick
> >pony of a module, but a very cool one..
> >
> >  Nils
>