problem creating noise source

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Discussion in 'General Electronics Chat' started by mpradhan, Feb 25, 2009.

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  1. Feb 25, 2009 #1
    mpradhan

    Thread Starter New Member

    Feb 25, 2009
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    Hi I am trying to create or produce noise in my circuit which deals with the design of a lock in detection system. I have already tried using a zener diode in reverse biase mode but did not get any results. Is there any other way of producing noise ? Thanks
     
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  2. Feb 25, 2009 #2
    Wendy

    Moderator

    Mar 24, 2008
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    What was the circuit diagram, and what is the low and high frequency cutoffs?

    I've always heard you need a lot of gain after a low level noise source, so I have to ask what kind of amplification you used.
     
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  3. Feb 26, 2009 #3
    KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    It's better to use a dedicated noise diode
    http://www.noisecom.com/products_noise_diodes.asp

    I've usually been able to get a couple of free samples from these guys.


    Eric
     
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  4. Feb 26, 2009 #4
    KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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  5. Feb 26, 2009 #5
    bertus

    Administrator

    Apr 5, 2008
    18,129
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    Hello,

    What is the frequency range of the noise ?
    Is it in audio range or do you need RF noise ?
    Do you need "pink" or "white" noise ?

    Greetings,
    Bertus
     
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