what am i doing wrong with the power supply?

[What's_nitro?]

Originally Posted by BrianG

I don't know if I'd do that. For one thing, the combined PS units would make for a fairly large thing to tote around. For another, ANY difference in the actual voltage will cause the PS with the higher voltage to heat up for nothing. It would be far easier to find one that has the capability you need, or simply get an actual 12v PS made for this type of thing. Just my opinion of course...

You could always use a higher-wattage resistor and run all of the regulation leads through it to help cope with any difference in voltage between the PS's. I'd also put a small bipolar capacitor between all of the (+) regulation leads to further smooth any V ripple. Maybe some bipolar caps on the output leads, too.