Joe, If you aren't married to the original element you could change it out to an electret element wired directly to the K3 input with the bias turned on. I did that than trying to find a replacement crystal element. The electret element is available from many sources (including your local Radio Shack) for a couple of dollars. Make sure to get the 2 wire version. Otherwise you could create a "phantom" voltage source in the D104 using a blocking capacitor on the FET output and a diode to a pad-out resistor and filter capacitor. I get good reports on audio quality on my electret but suspect it is the K3 not the microphone! George AI4VZ --------------- That circuit won't work with the K3's bias on mic pin (Joe's intended use).
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