Post your noise!~

[WJS]

first off, my'g9' based pre, is very loosely based, (I started a thread in the lab on g9 mods with a link to the schematic) and there is no gain knob so zero is already out the window there... and what kind of impedence are we connecting to the input? nothing? short? there are too many variables in my humble opinion to make this usefull. I also dont really have a way to measure the noise other than hooking it up to my mixer and reading the channel meter. if you really want this i'll do it....

Bill

 

[Learner]

[quote author="WJS"]first off, my'g9' based pre, is very loosely based, (I started a thread in the lab on g9 mods with a link to the schematic) and there is no gain knob so zero is already out the window there... and what kind of impedence are we connecting to the input? nothing? short? there are too many variables in my humble opinion to make this usefull. I also dont really have a way to measure the noise other than hooking it up to my mixer and reading the channel meter. if you really want this i'll do it....

Bill[/quote]

Sounds like its not a G9 clone??? Which makes it ineffective for this purpose, simply because we won't get enough measurments to get a accurate average. However, since you have 6 channels built you can still try to see how consistant the noise is in your circuit.

You can try to measure the output of both shorted input and no input with output turned up half way, do you get a lot of difference in the noise figure between shorted input and no input??

Try it on all 6 channels and see what you get in terms of rms, and post the result if you can.

 

[adamasd]

If nothing else I think this post shows that the board needs to get some standards of measurement for itself. It would improve comunication and is alot easier then the standard of describing the volume of the noise. This probably would not help the more prolific of our bunch, but it would certainly help out the less experianced. A meta full of information on how to go about measureing, standards of measurement and the like seem like it would be quite helpful.

adam

 

[bcarso]

Excellent idea Adam.

Noise measurements are among the trickiest of any in electronics. Even just understanding what the term "noise" means is non-trivial.

It's a little like pornography---as someone quipped, "I can't define it but I know it when I see it."

 

[WJS]

[quote author="bcarso"]It's a little like pornography---as someone quipped, "I can't define it but I know it when I see it."[/quote]

if you know it when you see it... what do you make of this?

 

[WJS]

had an idea:
posting my own noise:

sssssssshhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

:guinness: