Voltage Inverter / Doubler - September 2023 - Silicon Chip Online
This simple and low-cost circuit can produce a voltage around twice its DC input, or instead, a negative voltage of similar magnitude to the input. That can be handy in many situations, such as running op amps from a battery or DC supply, driving Mosfet gates, or providing a wider output range for adjustable regulators. by John Clarke
Source: siliconchip.com.au