[Elecraft] Powr supplies for "K" kits.

[Ron ZL1TW]

Greetings all,
                     There has been a bit of discussion on and off about 
suitable power supplies for the K1 and K2 tranceivers. Most appear to be 
opting for the switchmode supplies which must be tiny units, but still 
apparently can supply a bit of noise as well as voltage.
I decided some time ago to try and make a supply for the rigs I have here 
that would be safe and relatively easy to cart around without giving myself 
a hernia. I do have a 30 amp supply (real rupture material to cart around) 
and a supply I made up with two 12 amp/hr gell cells and trickle charger. 
(Mild hernia material)
However a supply mentioned in the 1996 CDROM version of the ARRL caught my 
eye and today I just finished it, and it appears to work well on both the 
K1 and K2 .
It is a 5 amp 13.8v supply that uses a LM338K regulator, and  3423 IC in a 
crowbar circuit to cater for any "nasties" that resulted in 
overvoltage.   The circuit is easy to make and setup, and works well. I 
have mine mounted in a computer power supply carcase that I have put a 
decent front panel on.
I have this one set to supply 14.4V and the crowbar come into action at 15.25v
Cheap to make, has good regulation , and supplies a nice clean DC output. 
What more could an Elecraft owner want?
I quite like the "Pass transistor" type of supplies...even if they are a 
bit inefficient compared with their switchmode brothers, but I also insist 
on having that crowbar circuit .........
Possibly worth a look at????.......especially for those suffering from 
solder fume withdrawal after finishing their kits???
Cheers......Ron ZL1TW