You're welcomed;? My first run with this (lower output audio than happy with, sans shouting) involved the pre-amp that was built into Midland land mobile radios back in the 1980's.? Having worked for ("as") an installer years ago, I found an organ donor in the pile and inserted that circuit into the uBitx. It worked fine and definitely ramped up the audio, though, for pocket change and three weeks shipping from the orient, I had 3 of these boards for playing with.? One had the magic smoke leak out (see "isolate original mike wire to board output") and the other 2 were used as previously posted.
The result has been similar or better audio gain, but with much wider forgiveness at the voice end of the mike. Whether I hold the mike 6" away or under my nose, I get full meter deflection on the antenna tuner's wattmeter, with my added output trimmer set maybe 70% of range (YMMV)..?
Ted