The circuit I built up on a breadboard produces 9V (well, something like 8.88V really) just fine, but my camera would not turn on! Naturally I went in to diagnostics mode (i.e. I started hunting for the cause by trial and error) and found that I was getting ... well, I'm not entirely sure what to call it. A glitch? Anyway, the voltage would occasionally pulse away from its steady state, anywhere from +/-200mV to over 1V!
After poking around a bit I finally tried hooking the scope up directly to the power output terminals of the BK Precision 1665 power supply I was using to drive my own power supply, and the same glitch was showing up even there, whether there was any load on the terminals or not. Here's the trace on my scope:
It looks absolutely terrible, however I don't think it's the root cause of the camera refusing to power on. I had tested the camera directly connected to the BK and was able to turn it on. It seems like the only remaining candidate is current, though I designed the power supply to be able to handle more than the 560mA that the camera pulls when powered on. More diagnostics are required.
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