[Elecraft] WJST and the K3

[Pete Smith]

My recent K3 has Bournes transformers on the KIO3A board.

73, Pete N4ZR

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On 7/3/2010 7:48 AM, Paul Christensen wrote:
>> So the K3 has a fully floating ground on the line audio input, isolated
>> from
>> the chassis??? Is that correct? 73 Tom
>>      
> The K3's line input transformer primary is connected to the 1/8" TRS jack
> using tip and sleeve where the sleeve floats above chassis ground.
>
> The on-line schematic of the KIO3 board was revised a few weeks ago and it
> looks like the Bourns LM-NP-1001 transformer may now be an alternative from
> Elecraft although I haven't looked at pin compatibility with the existing
> Tamura TTC-108 transformers.
>
> According to Jack Smith's measurements, the Bourns transformers have very
> good frequency response and THD characteristics as long as input levels
> remain at typical -10 dBV from consumer-grade PC sound cards.  At just USD
> $1.75 ea. from Mouser, they look like a good value.
>
> Paul, W9AC
>
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