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Originally Posted by Jimbo Mahoney
Hmm, bad news from me re: PSU:
The PSU I bought says not to use it with motors, lightbulbs or charging batteries!!!
I assume this means it uses PWM or something to give the 13.8v DC?
I assume also that this also means I can't use it with my AQX pumps?
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Jim;
2200uf would be an excellent choice. Not knowing why the company that makes that power supply would caution against using it with certain appliances is an enigma, but you're probably correct in assuming they skimped on the filtering capacitance. Many "wall warts" fall into that category, but usually the capacitance they provide only falls short if you draw near the maximum rated current. Nevertheless, I'd bet a 2200uf capacitor would suffice. You may have to parallel a couple of small values with the 2200 to cover any high frequency components in the output waveform, like a .01uf, .1uf, and 1uf. Maybe not. You're lucky to have access to an oscilloscope. They're great tools.
Hoot