[Elecraft] [K3] Shorting K3 PHONE jack outputs (WAS OT: Stereo to mono adapters)

[James Sarte (K2QI)]

BTW, one thing I noticed is that both stereo to mono adapters I
purchased short ring and tip together rather than ring to sleeve.
Since both hot signals are combined, isn't there still a load being
presented to the right channel amp?

I know some adapters will short ring to sleeve, thereby presenting a 0
ohm load to the amp.  In this case, that isn't happening.

My ohm meter shows when using a stereo to mono adapter while connected
to the mono DSP, ring and sleeve show a 22 ohm load; tip and sleeve
show a 22 ohm load, and ring and tip have a 1 ohm load as they're
shorted.

Seems safe to me?

Tnx,
James K2QI



On Fri, Dec 3, 2010 at 6:14 PM, Paul Christensen <w9ac at arrl.net> wrote:
> Jim (K9YC) is right.  When looking at the K3 schematic, realize that the
> headphone amp's 8-ohm build-out resistors are not on the same schematic page
> as the headphone amp.  At least it wasn't the last time I looked.
>
> Paul, W9AC