Recommended · for some experience
EEVBlog #473 - Microcontroller Voltage Doubler
Why people recommend it
Dave Jones shows how a microcontroller's square-wave output can drive a charge pump to double its supply voltage; suggested when a small higher-voltage rail is needed.
In their words
EEVBlog #473 – Microcontroller Voltage Doubler or the straight YouTube version.
MicroservicesOnDDD on electronics.stackexchange.com, Apr 2024. CC BY-SA.
For an idea on how this circuit works, see Dave Jone's excellent video explaining it.
tangrs on electronics.stackexchange.com, Jun 2015. CC BY-SA.