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Flip the switch and watch 9VDC get boosted to 18.5VDC.
I threw an LED on the end to show it being useful.
You could actually get away with using just the relay as a switch to ground, but E.C. doesn't calculate direct shorts so I threw in the Si transistor as the switch to ground. Honestly, it would probably be okay to leave in since I'd rather blow up a cheap transistor than my expensive power supply. Anyway, you would want to provide proper current limits and safeties to the base of that transistor, in real life, but maybe a 3904 npn could handle rapid pulses of 9VDC at about 40A or so. You can try it, if you want. I doubt I'll ever build this thing, neat as it seems.
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