[Elecraft] KX3 PC Headset Stereo mike

[Peter Eijlander (PA0PJE)]

Thanks George, I was looking for that schematic but probably didn't look 
hard enough:-)

72/73,
Peter - PA0PJE


GDanner schreef:
> Peter,
> Bias is "added" to the tip via menu.
>
> The voltage you read on the 1st ring is the pull-up for the PTT & UP/Down
> buttons.
>
> See the schematic for the MH3 microphone (
> http://www.elecraft.com/manual/MH3%20Rev%20A.pdf ).
> It does show the connections to the mic plug.
> I can not find the Mic jack on the KX3 schematics.
>
> I used the MH3 schematic to make an adapter to interface my K3 microphones
> in case I need my KX3 to back-up my K3 & KPA500.
>
> 73
> George
> AI4VZ
>
>
>
> -----Original Message-----
> From: Peter Eijlander (PA0PJE)
> Hi Dom,
>
> When I measure the mic connection with a standard 3.5 mm. stereo cable
> with two RCA plugs at the other end, I end up having no voltage on the
> tip of the 3.5 mm plug and 2.4 volts on the middle ring. That is the
> situation I'd expect it to be: These mics are usually wired for mic
> inputs of soundcards and they carry the bias supply voltage on the
> middle ring and the AF output comes from the tip.
>
> . . .
>
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