[AMRadio] Microphone recomendation

sbjohnston at aol.com sbjohnston at aol.com
Fri Sep 25 23:32:45 EDT 2009

I've been having some success replacing the preamp in the base of 
amplified D104 mics with an FET buffer stage to ensure the crystal 
element is working into a very high load impedance.  See...


The 4.7k resistor in the drawing can be changed to match other rig 
input impedances.

Steve WD8DAS

sbjohnston at aol.com
Radio is your best entertainment value.

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