L5rEAosd The new 13.8 V PS worked great.
Yeah, lab bench supplies have good regulation and low noise.
Power bricks are a crap shoot. Like the one you used earlier that can't even hold regulation. For low power (3A), I like to use the "medical" power supplies. Again, good regulation and really low noise (and "medical" ones have good isolation from the power line). I just measured the noise of this one (not available on Amazon, of course; you need to go to real electronics distributors like Mouser ot DigiKey :-) and it shows less than 5 mV RMS AC noise (most bench supplies don't come anywhere close -- even the one I use for my telescope setup [PowerWerx] is rated at < 100mV p-p [35 mV RMS] noise). The noisy power supplies that some people use to feed their sensitive cameras is just sad.
They make higher powered bricks and much higher powered wall mounted ones for hospitals.
Chen
