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

[Joe Subich, W4TV]

> I'm assuming however that a 2 circuit plug into a 3 circuit adapter
> should be fine; i.e. plugging a 3.5mm mono plug into 1/4" stereo to
> 3.5mm stereo adapter, which is then inserted into the 1/4" phone
> socket?

No!  Connecting a 2 circuit plug to a three circuit jack with tip
and ring used will short the ring to the sleeve (typically ground).

Plugging a 2 circuit cable into a mono (2 circuit plug) to stereo
(3 circuit jack) adapter will short all output since the mono to
stereo adapter simply connects the tip to tip and ring.

73,

    ... Joe, W4TV


On 12/3/2010 2:45 PM, James Sarte (K2QI) wrote:
> I'm assuming however that a 2 circuit plug into a 3 circuit adapter should
> be fine; i.e. plugging a 3.5mm mono plug into 1/4" stereo to 3.5mm stereo
> adapter, which is then inserted into the 1/4" phone socket?
>
> Tnx,
> James K2QI
>
> On Fri, Dec 3, 2010 at 2:14 PM, Jim Brown<jim at audiosystemsgroup.com>  wrote:
>
>> On 12/3/2010 8:29 AM, James Sarte (K2QI) wrote:
>>> Just wanted to get some advise before I continue with my experiment.
>>
>> Two-circuit 1/8-in plugs should NOT be used at the output of the K3. A
>> 3-circuit plug is needed. Nearly all pre-made patch cables are junk, and
>> many are wired wrong for our uses. We are hams. We can MAKE our own
>> patch cables, and we can study the schematics to see how to wire them.
>> Elecraft schematics are on line. Good quality 1/8-inch connectors are
>> made by Neutrik and Switchcraft, and are available on line from good pro
>> audio vendors like Full Compass Systems in WI.  I use miniature coax to
>> build them (like RG174, etc.)
>>
>> For part numbers, see http://audiosystemsgroup.com/HamInterfacing.pdf
>> There's a table on one of the slides.
>>
>> 73, Jim Brown K9YC
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