Ideal detector for a Shunt-fed Crystal Radio

Discussion in 'Wireless & RF Design' started by vu2nan, Feb 22, 2016.

  1. vu2nan

    Thread Starter Member

    Sep 11, 2014
    43
    10
    A diode with a forward voltage drop as low as 0.25 V may be configured by interconnecting the base and emitter of a Germanium transistor.

    [​IMG]
    Basic Shunt-fed Crystal Radio

    It's an ideal detector for a shunt-fed crystal radio.

    Regards,

    Nandu.
     
    Last edited: Feb 23, 2016
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    also, you can use schotkey diodes with a little bias, just enough so they just start conducting.
     
  3. vu2nan

    Thread Starter Member

    Sep 11, 2014
    43
    10
    Sure, Alfacliff.

    I've tried Schottky diodes from my junkbox, without bias.

    Relative performance (headphone current with the local 612 kHz, 200 kW AM broadcast station) is as follows:

    Germanium transistor with base/emitter interconnected - 500 µA
    MBR 1060 - 450 µA
    SB 810 - 350 µA
    SB 860 - 350 µA


    Many thanks.

    Regards,

    Nandu.
     
    Last edited: Feb 23, 2016
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