26 Oct
2015
26 Oct
'15
7:45 a.m.
Water in the dummy load? Water cooled - sure. Water immersed? Even though I see it
posted on the web, i have may doubts it would be a stable method.
Oil is the usual medium here. Excluding of course the pre-1980 transformer oils that
were notorious for having contaminated PCB?s within or anything with flammability at
working temperatures.
Jerry Weiss
WB9MRI
On Oct 26, 2015, at 9:27 AM, Paul Koning
<paulkoning at comcast.net> wrote:
On Oct 26, 2015, at 9:43 AM, Toby Thain <toby
at telegraphics.com.au> wrote:
On 2015-10-26 1:02 AM, Brian Archer wrote:
> Even a 10W resistor will get really hot. I embed two 5W resistors into a
> pentium class CPU cooler for a good compromise on space/thermal concerns.
My favorite low tech dummy load is the one my father came up with: a couple of resistors
(carbon composite is best, carbon film or metal film will do), 1-2 watt size, in a jar
filled with water. Works just fine for 100 watts or so, and is useable not just for power
supplies but for HF transmitter testing.
paul