[Elecraft] K1 backlight control

[hayden]

Rather than sacrifice the AGC control, I handled the on/off of the K1 
backlight by adding an internal on/off switch.  I used a very small 
Elecraft DPDT switch left over from the K1 Upgrade Kit I installed 
awhile back (I didn't need the ability to turn the tx mixer on during 
receive, so the switch was unused).

Looking at the the front panel's rear (where the MCU is located) I 
installed it on the upper right corner of the PC board. The switch is so 
small it is held in place with a tiny drop of medium thick CA glue. See 
picture at:

http://home.earthlink.net/~windependent/images/switch.jpg

I drilled two very small holes through the PC board with a pin vise and 
wired the switch in series with the anode of the backlight diode using 
kynar coated wire.

I leave the light on all the time when at home in the shack (95% of my 
operating). When portable or if current drain is an issue, all i need to 
do is back out the 4 screws holding the front panel in place and flip 
the switch.

Mike, AK3F
K1 #522