[Elecraft] K1 linear power supply

[lhlousek]

I generally use my K1 for hotel/P ops or at home.  Since AC was always near at
hand I didn't want have to carry a charger and futz with charging the batteries.
I also wanted to run 5 W on all bands.  I tried a number of small switching
power supplies but they all put out hash under one condition or another so I put
together a little linear power supply.

The supply is based on an $8, 15V unregulated DC wallwart from Jameco.  A couple
of filter capacitors, a low dropout Vreg and a few associated components are
mounted in a small Hammond die cast box that fits into the K1 in place of the
battery pack.  It can also be left outside the K1. This setup provides 12.25 VDC
at 1 amp, barely gets warm to the touch during normal operation and provides
plenty of juice for 5 watts on 40 thru 15 meters.

If you'd like more info let me know.

Lou W7DZN