The idea of this project is set-up a microphone preamplifier
with input for both dynamic and ECM (electret condenser microphone).
There are two different options. One preamp with only one BC549, a second one with two transistors.
The circuits below are very simple and include choke and by-pass capacitors to avoid RF interferences.
Also, both circuits provide optional R=10K to feed the ECM cartridge.
Both options will use the 8V output from the radio.
Soon we will show the PC board and enclosure.
Any comments or questions?
