> btw: you aren't going to drive a boost directly off an IO pin of a
> device pic that is being powered by the boost so your going to
> need at least a buffer stage

Good point. I did suggest a FET as a switch, although I actually
had current in mind rather than voltage. That would also be a
buffer. If the switching is done on the source B+ rather than Vcc
then it shouldn't make a difference if gate drive is 3V3 or 5V

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