For example, amplify the output of a crystal radio [[http://wiki.waggy.org/dokuwiki/electronics/crystalradio]]
For example, amplify the output of a crystal radio [[http://wiki.waggy.org/dokuwiki/electronics/crystalradio]]
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[[File:XO crystalradio.jpg]]
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This worked better on the XO1.5, presumably because of its higher processing speed. The headphones are omitted. A 0.1uF capacitor is connected between the radio output and the XO input to isolate the detector diode from the XO's DC bias. Theory predicts that a resistor to ground would be necessary at the radio output but practice indicates otherwise.