[Elecraft] Headphone socket

[G3SJJ]

That's what I needed Don, the pin positions on the jack I have is very 
different. I'll order one from Elecraft. Thanks for that.

73 Chris G3SJJ

Don Wilhelm wrote:
> Chris,
>
> I do not believe it is a direct replacement, and will not work without some
> re-wiring.
> If you look at the schematic you will find that the K2 headphone jack has an
> extra switch that is not connected directly to either the tip or the ring
> circuits.  That allows the switch to interrupt the path from the audio amp
> to the speaker connector while permitting R35, R36, C105 and C106 to be
> connected in the headphone circuit without affecting the speaker audio.
>
> The only headphone jack that I have been able to find that will replace the
> jack from Elecraft is a Kobiconn jack - Mouser www.mouser.com has it as PN
> 161-3503-EX.
>
> 73,
> Don W3FPR
>
>   
>> -----Original Message-----
>>
>> Just visited our local component store to buy some bits for the N0SS
>> noise generator, signal genny as in K2 manual, G3PJT decoder interface,
>> sidetone mod and tx agc power control mod, so that should keep me quiet
>> for a few days!!
>>
>> Anyway they had a 3.5mm headphone jacket which looked as though it might
>> replace the faulty one on my K2, assuming the pinouts and footprint are
>> the same, so I bought one. The isolating switch works and is not
>> connected to ground.
>>
>> This is the item and I wondered if anyone could tell me if it likely to
>> work. If so it would save me requesting one from Elecraft.
>>
>> http://www.maplin.co.uk/Search.aspx?criteria=FK20W&doy=18m1&source=15
>>
>> Chris  G3SJJ
>>
>>     
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