[Elecraft] K2-Bias Resistor When Using Mic Connector Pin 1 for Soundcard Input

[Jim Campbell]

Don,
Thanks very much for your response. I made the mistake of sending my email
in MIME format. I'm impressed that you were able to intuit my question from
the subject! The DigiRig schematic shows a blocking capacitor of 10 uF, so
it looks like I'm OK

My original email body was:

"’I'd like to connect a sound card output to a K2 mic connection. I’m using
a Digirig Mobile, their support page,
https://forum.digirig.net/t/cables-for-elecraft-k2/1147 , suggests
connecting it to the mic connection pin 1. My K2 has a 5.6K resistor
between pins 1 and 6 (as I understand it, required for my MD-2 mic). Does
this bias resistor need to be removed when I connect the sound card
output?"

Jim-VE1KM

On Sun, Apr 2, 2023 at 9:13 PM W3FPR <w3fpr111 at gmail.com> wrote:
>
> Jim,
>
> If I understand your question in the subject line (but no text to detail
> your question) - then the answer is that it all depends on the
> soundcard.  If it has a DC blocking capacitor in the input, then all is
> well with the bias resistor in place.  If there is no DC blocking at the
> soundcard, the the bias resistor will have to be removed or a special
> cable with a DC blocking capacitor will have to be inserted between the
> mic input and the soundcard AF input.  A capacitor of 1 to 5 uF should
> do fine.
>
> If this does not answer your question, the respond with more text
> instead of us trying to guess from just a subject line.
>
> 73,
> Don W3FPR
>
> On 4/2/2023 6:31 PM, Jim Campbell wrote:
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