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

[James Sarte (K2QI)]

Thank you Joe.  That really puts my mind at ease.

Vy 73,
James K2QI

On Fri, Dec 3, 2010 at 12:49 PM, Joe Subich, W4TV <lists at subich.com> wrote:

>
>  With that said, is it safe to bridge the L&R channels coming out of
>>> the K3'sphone jacks, front or rear panel without fear of damaging
>>>
>>> the amplifier? The ANEM presents a 22 ohm load to the K3.
>>>
>>
> Yes, it is safe to sum the *headphone* jacks since both the front and
> rear panel headphone jacks include 8.4 Ohm resistors in series with
> each (tip and ring) output.
>
> *WARNING* do not sum the Speaker output or use a mono cable in the
> speaker jack as the speaker output does not include any resistor and
> shorting an output (or driving power into an unused output) can
> destroy the speaker amplifier.
>
> 73,
>
>   ... Joe, W4TV
>
>