On 9/24/2012 1:59 PM, Bob Kay wrote:
I apologize if this is a bit off topic, but I could not think of a better
place to start. I noticed in the advanced transmit audio section there were
preconfigured choices for several microphones. I'd like to see what my Flex
5K can do with an original D-104. I can't imagine that the Flex's audio
input stage will do any justice to the extremely high impedance the D-104
offers.
Has anyone used one? Can you point me to any matching circuits or audio
settings that sound OK?
Something similar to this should work fine:
http://www.diyaudio.com/forums/blogs/rjm/attachments/591d1329177386-activator-2-fet-preamp-guitars-basses-aplocalypse.png
Just make sure that the load resistor on the crystal element is 10
Megohms or more for best fidelity. When loaded properly, an intact
original D-104 will have the low end response of a studio microphone
but with a distinct rising "presence" characteristic maxing out
around 4 kHz.
Happy experimenting,
Kevin, WB4AIO.
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