=  NOW 5 WPM  =  TEXT IS FROM DECEMBER 2022 QST PAGE 32  =

THE DETECTED AUDIO OUTPUT IS CONNECTED TO THE INPUT OF THE AUDIO
PREAMPLIFER, THEN TO A VOLUME CONTROL.  THE RETURN FROM THE VOLUME CONTROL
PASSES THROUGH A LOW PASS FILTER TO ATTENUATE UPPER AUDIO RESPONSE ABOVE 3
<  QST DE W1AW  =
KHZ, THEN INTO AN LM386 AUDIO IC, WHICH DRIVES THE SPEAKER.  AUDIO IS
SAMPLED AT THE OUTPUT OF THE AUDIO PREAMP AND USED BY THE AGC CIRCUITRY TO
=  END OF 5 WPM TEXT  =  QST DE W1AW  <