Re:Pump up the charge: Getting -5V from a 5V power supply
by jacquesm on Sunday October 10, 2021 @09:43PM
(#28823737)
Maxim pioneered the charge-pump-on-a-chip concept with their groundbreaking MAX232, the first time you could get a single chip RS232 interface going without having three power supplies. Fantastic little device.
[ Parent
| on HN ]
Re:Pump up the charge: Getting -5V from a 5V power supply
by raverbashing on Monday October 11, 2021 @03:34AM
(#28825785)
Came here to say exactly that. The MAX232 is a staple of RS232 connections to microcontrollers. +5v/-5v (maybe it goes higher?) with a couple of electrolytic caps and that's it