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 > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
