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OT: Does anyone have a good, simple random noise generator?

autodeskguest

Does anyone have a schematic for a good, simple random white noise generator.  I

want to use this for audio with a bandwidth up to 25KHz.  I am not particularly

interested in perfect statistical randomness.

 

Thanks in advance.

 

Steve

 

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  • On Tue, 05 Aug 2008 23:20:16 -0400, Steve Jacobson

    <stevelists@jjworld.com> wrote:

     

    I will be running the thing at 9V.  Should I be using a current limiting

    resistor?  Also, what would be a good NPN transistor?

     

    I would not use a transistor at all.  Reverse biasing a base-emitter

    junction may simply destroy the junction.  You never really know.  It

    may work OK for a hand-built hobby project, but I would not use it in

    anything that I was going to sell.

     

    Instead, use a reversed-biased Zener diode.  They are designed to be

    reverse-biased.  Here is an app note from Maxim (although you can

    probably ignore the use of special low-noise Maxim op amps):

     

      http://www.maxim-ic.com/appnotes.cfm/an_pk/3469

     

     

    Robert Scott

    Real-Time Specialties

    Ypsilanti, Michigan

     

Reply

  • On Tue, 05 Aug 2008 23:20:16 -0400, Steve Jacobson

    <stevelists@jjworld.com> wrote:

     

    I will be running the thing at 9V.  Should I be using a current limiting

    resistor?  Also, what would be a good NPN transistor?

     

    I would not use a transistor at all.  Reverse biasing a base-emitter

    junction may simply destroy the junction.  You never really know.  It

    may work OK for a hand-built hobby project, but I would not use it in

    anything that I was going to sell.

     

    Instead, use a reversed-biased Zener diode.  They are designed to be

    reverse-biased.  Here is an app note from Maxim (although you can

    probably ignore the use of special low-noise Maxim op amps):

     

      http://www.maxim-ic.com/appnotes.cfm/an_pk/3469

     

     

    Robert Scott

    Real-Time Specialties

    Ypsilanti, Michigan

     

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