[ARC5] BC-230 mic

[AKLDGUY .]

I'd like to use an electret microphone from a taxi radio with the BC-230.
If the filaments were run on 12.6 VDC and the DC feed to the mic via
the primary of the mic transformer was retained, there should be enough
power for the electret mic plus a small preamp to develop a volt or two
of audio in the primary.

It should be possible to use the same wire for the DC feed and audio by
using a dropper resistor to supply the mic and preamp. The audio would
be developed across the dropper resistor, which would need to be very
well decoupled on the mic/preamp supply side. Has anyone tried this?

73 de Neil ZL1ANM