Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again

[Jerry Weiss]

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
> 
>