Scott Dorsey wrote:
What are your thoughts on this?
http://sound.whsites.net/project66.htm
This circuit is pretty much what you will find in any transformerless mike
preamp with a couple exceptions.. everything from Millennia to Mackie. It is
as good as the front end is allowed to be.
The 2N4403 is not exactly a low noise transistor but if you're careful about
where you get them and cull out the occasional outlier, they can work pretty
well in this circuit.
** The 2n4403 is still one of the best available devices for low noise at microphone impedances. The measured noise figure of 1dB speaks for itself.
I disagree strongly about there being no problem with DC bias on modern
electrolytics,
** Disagree all you like, but there is no issue.
I might
also dramatically increase the values of C2 and C3 well beyond the values
needed to get good response.
** Using 10uF caps as shown gives a -3dB point under 1Hz.
..... Phil