"Don Pearce"
Poopie Bear


Yes that is very similar. The great thing about using these discretes
as front ends is that the knee frequency for 1/f noise is way lower
than the transistors in the average op-amp. So not only don't they
hiss - they don't rumble either. Three of them in parallel is about
right for a mic at about 150 to 200 ohms.


** More totally asinine crapology from the Pommy RF Fool.

Audio band white noise is totally dominated by high frequency noise !!

Hence - there is no audible "rumble noise" from mic pres based on op-amps
or transistors.


But what about the current noise?


** With a FET ?

With a 200 ohms source ??

What drugs is this ****ING JERK taking ???

Or not taking ??



Hmmm, I wonder how that would go down with those who 'cheat' by using a
150 ohm source
instead of 200. I note that Mackie ( I think ) is now quoting noise with
the input
*shorted* too.


** Some condenser mics have very low output Zs - less than 20 ohms.

Not wrong to quite the noise for that case.




........... Phil