Tom,
I would suggest if you do that, to use the cathode of D12 for the source
of your voltage. That is turned on/OFF with the K2 power switch.
The K2 maximum current (CAL CUR) is normally set to 3.50, and the
internal fuse is rated at 5 Amps.
The difference is 150 ma, but I would suggest limiting the draw to 100
ma or less. The W1 is spec'ed at 30 ma with 10 LEDs lighted, so no problem.
73,
Don W3FPR
On 7/9/2012 7:43 PM, Tom McCulloch wrote:
> Hi gang,
> I have a W1 watt meter, which I probably purchased just before the W2
> was released, and I'm finally fed up with changing the 9 volt battery
> every time I forget to turn the W1 off. So I'm thinking of pulling the
> voltage from my K2 to power the W1.
>
> In the back of my mind I'm remembering a thread from a good number of
> years ago which advised "Don't pull any voltage from the K2 for external
> uses". Does anyone know if it would be OK to take 9 to 13 volts from
> the K2 to power my W1 (which really doesn't draw much current). If so,
> has any one tapped into the K2 to set up a voltage out jack? I'd be
> interested in knowing where you took the voltage. I'm looking at P3 or
> perhaps F1 (I have the the battery installed in the K2).
>
> OK and thanks for any help you may provide.
>
> Tom, WB2QDG
> K2 #1103
>
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