[ARC5] BC-230 mic

[Ben Hall]

Hi Neil and list,

I plan to do something similar for my BC-230: Use a Motorola microphone 
with a built-in transistor pre-amp fed from the 12.6 VDC line as you 
note below.

I've not tried it on the BC-230, but looked good on the scope with my 
9-year old son singing into it...  ;)

thanks much and 73,
ben, kd5byb

On 11/6/2014 7:25 PM, AKLDGUY . wrote:
> 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?