Another Crystal Radio Variant

Discussion in 'Wireless & RF Design' started by vu2nan, Oct 4, 2015.

  1. vu2nan

    Thread Starter Member

    Sep 11, 2014
    A 7" long, 2" diameter PVC pipe doubles as coil former and enclosure for this crystal radio. A couple of white plastic cosmetic jar covers serve as the end caps.


    Another Crystal Radio Variant
    The coil is (280 + 40) turns of 30 SWG enamelled copper wire close-wound as shown. The PVC variable capacitor is mounted on one of the end caps.


    Another Crystal Radio Variant - Schematic
    The OA79 diode feeds a pair of sensitive balanced-armature phones.

    Reception, with a wire antenna 60' long, is quite good. Headphone current, measured using a 1mA FSD 60 Ω meter, is 300 μA.