From: legg@nospam.magma.ca   
      
   On Thu, 11 Dec 2025 07:17:47 -0900, Christopher Howard   
    wrote:   
      
   >legg  writes:   
   >   
   >>>(1) a 47 uF capacitor from the signal input pin (pin 3) to ground.   
   >>>   
   >>   
   >> ?   
   >>   
   >> This doesn't load the input signal?   
   >   
   >I assumed it was causing the HF interference to get shunted to ground,   
   >instead of going into the input pin. But I'm open-minded to better   
   >explanations or ideas. In any case, it is the only thing that has worked   
   >so far.   
      
   And you're actually measure 100mV rms across the 47uF capacitor?   
      
   At 1KHz, 47uF looks like < 4ohms.   
      
   Audio signal sources normally look to work around a 600 ohm line.   
   The source impedance will normally be lower than the load.   
      
   RL   
      
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