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If you need high current, you are going to have to use a more complex approach. You will need to use a switched mode power supply using an inductor or transformer. You will have to convert the +5v to AC, boost the voltage to account for circuit losses, then regulate it back to -5vdc. If you need high current, how much do you need? Your requirements will dictate the best approach.
i don't know what your application is, but i think in many cases a negative voltage could be avoided by a good design with only positive supply. if it's possible, this should be the simplest way.
It depends on how much current you need. For low current applications, there are many ways to invert the voltage with switched capacitors:
https://www.aaroncake.net/circuits/vinvertr.htm **broken link removed** **broken link removed**
If you need high current, you are going to have to use a more complex approach. You will need to use a switched mode power supply using an inductor or transformer. You will have to convert the +5v to AC, boost the voltage to account for circuit losses, then regulate it back to -5vdc. If you need high current, how much do you need? Your requirements will dictate the best approach.
I have built the https://www.aaroncake.net/circuits/vinvertr.htm
circuit and there is a small error in there. Pin 7 needs to be connected to the common connection of R2 & R1 and current R2 end connected to pin 7 needs to go to pin 8.
I don't need a high-current components, 20 mA would be enough for me.
Unfortunately, I can't get not LM828 nor ICL7660 or MAX660 in my local stores.
The 555 circuit seems to be nice, but does it give stable output voltage?
Are there any other options?
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