[sdiy] single 9 volt battery white noise source

Dave Leith dave.leith at gmail.com
Sat Jul 18 02:09:30 CEST 2009

This circuit looks good...except the IC's are powered by dual 9Volt
batteries. Looking for a single 9V battery as I'm wanting to add a
noise source to a thingamakit http://bleeplabs.com/thingamakit/

On 7/17/09, David G. Dixon <dixon at interchange.ubc.ca> wrote:
> > Reading thru the documentation for the Rainmaker seems that this would
>  > be the best solution. Is the following really the case?
>  >
>  > quote" Common designs use invariably Zener diodes or reverse-biased
>  > transistors base-emitter junctions as white noise generators. The main
>  > snag of these circuits is that a supply of at least 12V is required,
>  > therefore a big battery pack or (more commonly) mains supply is used
>  > as power source."
> Ray Wilson's Sound Lab uses the reverse-biased E-B junction method, on a 9V
>  supply, and it works just fine (presuming you choose a transistor which
>  actually makes noise!).

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