[sdiy] prob with noise circuit?

[Pete]

Ok its working now. I had tried the 741 and nothing came out until I used a 
TL071. Thanks Paul! Now I have a new prob though. I get a low frequency hum. 
Do you also have to ground the op amp? Are the offset null pins used for 
ground? Thanks for helping out guys with my basic questions.

pete

On 5/30/05, Roy J. Tellason <rtellason at blazenet.net> wrote:
> 
> On Monday 30 May 2005 04:33 pm, Pete wrote:
> 
> > > Also, transistors used like this usually need to be selected for noise
> > > output. Some 3904's will create a good noise level... some will be 
> quiet.
> > > Expect to have to swap in a few different transistors before you find 
> one
> > > that you like.
> 
> This is where a _transistor socket_ comes in handy...
> 
> When's the last tiem you saw one of those? Oh, and of course that won't 
> work
> for SMDs. :-)
> 
> 
> 
> 
> 
> 
> 


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