On 05/07/2011 07:10, IVP wrote:
> is it possible to make -10V from one or more PIC pins ? The graphic
> LCDs I need to use for a project require about -10V @ 5mA for Vee.
> The -10V is fairly specific. Even slightly less negative than that and th=
e
> contrast is no good
>
> I've looked around and found switched capacitor and capacitor-diode
> designs for positive doublers, positive triplers but not greater than uni=
ty
> inverters.

Actually see  3rd schematic here, just leave out the +ve multiplier.
http://en.wikipedia.org/wiki/Voltage_multiplier

Voltage is less number of diode drops and current is very limited.
--=20
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