[hpsdr] Hermes audio noise

[FRANCIS CARCIA]

Happy Thanksgiving all,
I just finished my Hermes enclosure and hope to power it up after I recover from the Thursday feast.
Sounds to me like a low frequency oscillation in the audio ampifier. It may be load dependant or power supply bypass issue. Try a small cap or reisitor in series with a cap across the audio output. A couple other options add more C at the power input of the audio amp and last try some high frequency negative feedback around the amp. Frank WA1GFZ
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