|[AMRadio] D-104 modifications|
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
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