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

[Jim Brown]

On 12/3/2010 2:31 PM, James Sarte (K2QI) wrote:
> Now what am I to believe here???  If I understand what was written in
> the manual, then it's ok to use a mono plug in those jacks as they're
> buffered by a series of resistors.
>

The manual is correct -- the HEADPHONE output is isolated with 
resistors. The SPEAKER output is NOT, and putting a two-circuit plug 
(mono plug) into it can cause the output chip to fail destructively.

Again, the SCHEMATICS are on line. Study them.  We're hams. We passed 
exams showing that we know this stuff.

73, Jim K9YC