[Elecraft] K3 audio speaker jack

[Joe Subich, W4TV]

>> Shorting the outputs of the audio channels together MAY not blow
>> anything up,

*May* is the operative word.  If one has the sub RX on with audio
balance fully to one side and audio turned toward the maximum
driving relatively high impedance speakers, the amplifier *can*
be damaged.  Since the amplifier is fragile enough and it is
located on the DSP board (difficult to access and replace),
connecting the left/right channels in parallel is an extremely
bad idea.

73,

    ... Joe, W4TV

On 10/27/2010 3:28 PM, Guy Olinger K2AV wrote:
> Shorting the outputs of the audio channels together MAY not blow
> anything up, but it puts the output of one channel as the load of
> another.  Translate: distortion.  Do NOT use the RS adapter.  73, Guy.
>
> On Wed, Oct 27, 2010 at 3:22 PM, Joe Subich, W4TV<lists at subich.com>  wrote:
>>
>>   >  Incorrect. The adapter combines both channels into one.
>>
>> No, the Radio Shack adapter shorts the outputs of the audio
>> amplifier to each other with no "build out" resistor.  That
>> can damage for the amplifier chip - the LM4950 is not spec'd
>> for parallel operation.
>>
>> As Wayne has already stated, do not connect the tip/ring
>> together.
>>
>> 73,
>>
>>     ... Joe, W4TV
>>
>> On 10/27/2010 2:31 PM, k.igor at comcast.net wrote:
>>>
>>>
>>> Incorrect. The adapter combines both channels into one. Nothing is shorted to ground.
>>>
>>>
>>> ----- Original Message -----
>>> From: "Ken Kopp"<k0pp at rfwave.net>
>>> To: "k igor"<k.igor at comcast.net>, elecraft at mailman.qth.net
>>> Sent: Wednesday, October 27, 2010 12:48:57 PM
>>> Subject: Re: [Elecraft] K3 audio speaker jack
>>>
>>> The RS adapter will merely move the point
>>> where the short occurs. The one channel of
>>> the stereo adapter will still be shorted by the
>>> mono plugs on the speaker/s.
>>>
>>> 73! Ken Kopp - K0PP
>>>          ElecraftCovers at rfwave.net
>>>
>>>
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>