[Elecraft] K3 line in, line out transformers.

[Don Wilhelm]

Larry,

Note that there are only 3 transformers physically on the KIO3 board 
(not 6).  So only one is used of each pair shown on the schematic. Note 
that one set is labeled as "ALT" meaning alternative.
For that application, the phase is not critical, except that the stereo 
channels must match.
Why it is represented that way on the schematic, only the designer can 
answer.  I am certain it has something to do with the schematic to board 
layout program that was used.

73,
Don W3FPR

On 4/8/2014 8:51 AM, Larry Lopez wrote:
> The K3 has isolation transformers for the line input (mono),
> and line output L and line output R (stereo).
>
> There are 3 sets of 2 transformers.
>
> In each set, the circuit diagrams shows the transformers
> in parallel with opposed phase.
>
> Please see the K3 Circuit diagram KIO3 Main Sheet 2,
> top left quadrant.
>
> one of each pair is labeled TTC-108 600 ohm line transformer 1.5 KV
> isolation,
> the other of each pair is labeled LM-NP-1001 600 ohm line transformer, 6.5
> KV isolation.
>
> I'm going to take a stab at explaining this.
> I bet only one transformer or the pair is actually used.
>
>
>
>
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