I found a couple of schematics for voltage inverters using a 555 timer:
The first website says that the circuit only provides a limited amount of current. I need to convert +5V from my supply (a USB cable) to -5V and power three op-amp ICs in dual-supply mode: two LM324s and one LM339. All 12 op amps will be used. Will this draw too much negative current from the 555 circuit?
Are there better options for converting +5V to (roughly) -5V?