[Elecraft] Power Supply short protection

[Dave G4AON]

You need plastic covers over those transistors. A cover over the output 
connections wouldn't be a bad idea either.

On the subject of power supplies, I run a Racal 115-12-35CD linear power 
supply and it's a nice bit of kit. They were manufactured by NewMar of 
Newport Beach, CA. Several appeared here as "new old stock" in unopened 
packaging on the UK surplus market a few weeks ago, but I've not seen 
any since. They are rated at 35 Amps continuous up to an ambient temp of 
50 deg C, and have thermal shut down, current limiting, over voltage 
protection (crowbar and fuse) and are built like a tank. The only 
downside is the weight - 30 lbs... at least it doesn't produce birdies 
all over HF!

73 Dave, G4AON
K3/100 #80
----------------

I am running my K3 from an Astron 35M. I experienced an accidental short
circuit on the power supply and I am wondering what everyone else does about
the possibility of accidental shorts from exposed 12V wire lugs or the
exposed pass transistors on the back of power supplies (hot transistor
collectors).

In my case the PS is on the floor and you guessed it close to my shack
ground braid. While fiddling the ground braid touched one of the pass
transistor collectors and everything shut down, no damage done than
goodness. I would like a more permanent solution.

Mike Scott - AE6WA