most receivers don't provide automatic volume control on code reception. thus a CW signal that blows your headphones off one moment might lie buried on the threshold of hearing the next. the headphone limiter chops those S9-100 signals down to size until they equalize with weaker signals, giving relatively constant headphone volume. because the clipping action produces some distortion, the limiter should feed a headphone Q-peaker (described in another circuit). the value of Rx should match the existing speaker impedance and power. in most cases this will be equal to 4 ohms at 2.5 watts.
PARTS LIST FOR HEADPHONE LIMITER
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D1,D2-1N60 diode. R1-5000-ohm audio taper potentiometer. Rx-see text
I feel a lot more people need to read this, very good info! . 10 naked links
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