Burkhard Kainka
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Diode Radio for Low Impedance Headphones

If you ever look at construction notes for building old detector type radios the type of headphones specified always have an impedance of 2 × 2000 ?. Nowadays the most commonly available headphones have an impedance of 2 × 32 ?, this relatively low value makes them unsuitable for such a design. However, with a bit of crafty transformation these headphones can be used in just such a design.
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