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Electret Mic without power?

Discussion in 'CB Radio Forum' started by rabbiporkchop, Feb 28, 2017.

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  1. Feb 28, 2017 #1
    rabbiporkchop

    rabbiporkchop Road Train Member

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    I just cracked open my AT-6666 stock mic to cannibalize parts to build a better mic without the acoustic deficiencies of the Anytone mic case, plus having the option of adding a noise cancelling electret in the future,
    and noticed pin 6 with dc voltage is unused. I also noticed no capacitor inside the mic to prevent dc voltage from feeding back into the audio chain. How does this thing work?
    1488299381305.jpg 1488301735659.jpg
     
    rabbiporkchop, Feb 28, 2017
    rabbiporkchop, Feb 28, 2017
    #1
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  3. Feb 28, 2017 #2
    CW Spook

    CW Spook Light Load Member

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    Looks to me that the schematic is showing a dynamic mic, but that 13 volts is available on the radio connector side for power to an electret if it's equipped with a properly wired cable.
     
    CW Spook, Feb 28, 2017
    CW Spook, Feb 28, 2017
    #2
    rabbiporkchop Thanks this.
  4. Feb 28, 2017 #3
    Ridgeline

    Ridgeline Road Train Member

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    I sort of second that, the power is also used for a mic with tone buttons (lack of a better term), the radio is a universal radio, it covers a lot of different markets and could be used in commercial applications.
     
    Ridgeline, Feb 28, 2017
    Ridgeline, Feb 28, 2017
    #3
  5. Feb 28, 2017 #4
    rabbiporkchop

    rabbiporkchop Road Train Member

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    It is an electret soldered to the pcb.
    That's what confused me.
     
    rabbiporkchop, Feb 28, 2017
    rabbiporkchop, Feb 28, 2017
    #4
  7. Feb 28, 2017 #5
    CW Spook

    CW Spook Light Load Member

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    Well, if that's the case, I don't know for sure either. The wire marked RX on the schematic is actually for the up-down buttons. Maybe in TX it supplies power to the mic element.
     
    CW Spook, Feb 28, 2017
    CW Spook, Feb 28, 2017
    #5
    rabbiporkchop Thanks this.
  8. Feb 28, 2017 #6
    rabbiporkchop

    rabbiporkchop Road Train Member

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    Looks like I got a new project.
    If I'm lucky it will sound almost as good as the Heil PR40.
    [​IMG]
    [​IMG]
     
    Last edited: Feb 28, 2017
    rabbiporkchop, Feb 28, 2017
    rabbiporkchop, Feb 28, 2017
    #6
  9. Mar 1, 2017 #7
    Ridgeline

    Ridgeline Road Train Member

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    It's not an electret element.
     
    Ridgeline, Mar 1, 2017
    Ridgeline, Mar 1, 2017
    #7
  10. Mar 1, 2017 #8
    rabbiporkchop

    rabbiporkchop Road Train Member

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    What isn't?
     
    rabbiporkchop, Mar 1, 2017
    rabbiporkchop, Mar 1, 2017
    #8
  11. Mar 1, 2017 #9
    Ridgeline

    Ridgeline Road Train Member

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    That isn't
     
    Ridgeline, Mar 1, 2017
    Ridgeline, Mar 1, 2017
    #9
  12. Mar 1, 2017 #10
    rabbiporkchop

    rabbiporkchop Road Train Member

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    It sure looks like some sort of transducer. If it isn't an electret then what is it?
     
    rabbiporkchop, Mar 1, 2017
    rabbiporkchop, Mar 1, 2017
    #10
    Blaskowitz Thanks this.
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