Pump up the charge: Getting -5V from a 5V power supply

Re:Pump up the charge: Getting -5V from a 5V power supply by bombela on Sunday October 10, 2021 @07:12PM (#28822806)

First you charge the capacitor like so from the 5v supply.

   +5v -> +
          Cap
    0v -> -

Then you disconnect the capacitor and reconnect it this way:

    +5v ------> +5v
    0v -> + --> 0v
          Cap
          - --> -5v

Compared to 0v you now have -5v. Consequently you get 10v between the two extremes. The capacitor will deplete fast. So you would repeat the cycle quickly. And add some more circuitry to smooth the output.

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Re:Pump up the charge: Getting -5V from a 5V power supply by dTal on Monday October 11, 2021 @04:39AM (#28826142)

This comment deserves some kind of award for such a clear and succinct explanation.

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