While it’s impractical in real-world designs, is it possible to take a 1.5V AA battery and use some sort of circuit to boost to roughly 9V with around 10mA max output? There are so few chips that operate at below 3V and can do so efficiently. I’m assuming that this AA wouldn’t last as long as a more practical 9V battery, but this circuit is just for the heck of it..

  • \$\begingroup\$ A joule thief followed by a smoothing circuit could probably provide 10mA at 9V. \$\endgroup\$ Commented Jun 15, 2021 at 17:57
  • 2
    \$\begingroup\$ Asking what is best or if something is possible may not be very good questions. Best always depends on what you value most and we don't know much about it, so it is opinionated and most likely it is possble to do this, so could you be slightly more specfic what problem are you trying to solve instead? \$\endgroup\$
    – Justme
    Commented Jun 15, 2021 at 18:04
  • \$\begingroup\$ If this did ever go into a design I would favor efficiency thus longer lasting battery. (edited title) \$\endgroup\$
    – zvolk4
    Commented Jun 15, 2021 at 18:26
  • \$\begingroup\$ @zvolk4 This seems like you would be better off changing the consuming circuit. 9V seems an unusual value for the regulated voltage. \$\endgroup\$ Commented Jun 15, 2021 at 18:38
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    \$\begingroup\$ also citation needed on the 3V quote, 1.5V is a pretty common operating voltage. \$\endgroup\$ Commented Jun 15, 2021 at 18:44


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