[sdiy] prob with noise circuit?

[yves usson]

Hi Pete

Yes you MUST apply +15v to pin 7 and -15v to pin4 of the 741. The 741 is 
an OPA and it needs some energy
to work.

Yves

Pete a écrit :

> Hey everybody. I have been trying to get this circuit to work but I 
> simply don't understand why I get no sound out of it. This is out of 
> Thomas Henry's "Noise Generator Cookbook" In the book he mentions to 
> use a, 2n2712 for the transistor or a 2n3904. I am using a 2n3904. I 
> built this basic circuit on a breadboard, and im using a 1/4" jack for 
> the output, and a 15v power supply. Do I have to apply power to the 
> pins of the 741? It does not specify to do so. I attached a pic of the 
> circuit. Im pretty much a beginner on this stuff and trying to teach 
> myself. I have rebuilt this thing a few times double checking 
> everything. According to the book there should be a good amount of 
> noise coming out of this thing. Is there something that I am not aware 
> of that im overlooking?
>
> Thanks
> pete
> -- 
> listen to my latest tunes,
>
> http://www.cubanpetemusic.com/p23%20Litmus.mp3
>
> www.cubanpetemusic.com <http://www.cubanpetemusic.com>
> ------------------------------------------------------------------------
>


-- 
Yves Usson

Lab. TIMC UMR5525 CNRS
Institut d'Ingenierie et de l'Information de Sante (IN3S)
Domaine de la Merci
38706 La Tronche cedex

email : yves.usson at imag.fr, yves.usson at ujf-grenoble.fr

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