[AMRadio] D-104 modifications


Paul Christensen w9ac at arrl.net
Thu Aug 26 20:27:44 EDT 2010


>.........just a nice crystal mic element driving the first audio stage. 
>Terminate it properly.

Or rather, unterminate it properly and ensure the cartridge sees between 
5-10 megohm of load impedance.  For terminations into solid-state mic 
premaps where the input Z is of low or medium values, there are numerous 
D104 buffer circuits posted on the web - some are designed better, and 
worse, than others.  My rendition appears toward the bottom of my QRZ.com 
page:

http://www.qrz.com/db/W9AC/

Paul, W9AC 



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