[Elecraft] K2 audio output question

[Geert Jan de Groot]

On 04/01/2021 04:13, elecraft-request at mailman.qth.net wrote:
> Is there a way to have both headphones and external speaker active at the
> same time?  I'm thinking of being able to have audio for visitors while
> still using headphones to copy.

In addition to Don's response, you may want to look at this:
https://www.w8fgu.com/pics/k2faob/w3fpr_K2%20audio%20Fix.pdf
http://www.w3fpr.com/download_files/FP-CB%20mounting%20photos.pdf

I have done this, using a piece of perfboard.
To avoid shorts, in my case the PCB is in a piece of heat shrink tube.

If you want a kit, check out https://www.w8fgu.com/k2_fixedaudio.html

Instead of perfboarding it, I should have bought a kit from Dave, but 
sending a parcel by mail to PA0 would need me to mortgage my house, not 
to mention a lot of patience (another PCB ordered recently was stuck for 
*nine months* in Chicago).

The advantage is that the 2nd output is fixed audio volume, so you can 
adjust the speaker audio and the headset audio separately.

In my case (connecting multiple headsets on the speaker output) this 
approach has another advantage: I added audio sidetone to my K2 so that 
the people using headphones can hear eachother speak, yet the 
fixed-audio output doesn't have this, so there is no feedback from the 
speaker.

When you use a speaker, make sure you use one that works well for SSB 
audio. For visitors, I would consider making some headsets available 
instead. SSB-via-speaker is more difficult to decode, SSB-via-speaker 
for people without SSB ears will just result in "there was a guy playing 
radio noise" at the exhibition.

73,

Geert Jan PE1HZG