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

[Steve Ellington]

How could a 2 circuit plug be mono since there is only 1 circuit?
N4LQ
Steve

----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: <elecraft at mailman.qth.net>
Sent: Friday, December 03, 2010 5:57 PM
Subject: Re: [Elecraft] [K3] Shorting K3 PHONE jack outputs (WAS OT: Stereo 
to mono adapters)


> 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
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