I also had low mic input on both bitx40 that i built.
I added a mic preamp and it made the ssb transmissions have lots of audio with good clean audio.
I just used some cheap china module. A couple of dollars.
No more yelling in the mic.
Joe
VE1BWV
On Tue, Jun 6, 2017, 10:35 PM Jerry Gaffke via Groups.Io <jgaffke=
[email protected]> wrote:
The microphone amp is driving a very low impedance load, won't see much voltage gain?
across the microphone amp unless you remove C106.
See this post and the thread around it: ??/g/BITX20/message/22836
On Tue, Jun 6, 2017 at 06:23 pm, Arv Evans wrote:
The electret microphone should put out around 45 mv at normal voice levels.? The microphone
amplification stage has to make up the difference between that and what the BFO mixer needs
for full output.
?
