Thanks very much!

Tamas


On 10/08/06, Jinx <joecolquitt@clear.net.nz> wrote:
>
> > The question is what do you think if I just put a 4.7 zener in
> > between the Vdd and Vss?
>
> You'll need a series resistor too. It needs to be small enough to
> make the zener break down (otherwise the excessive Vin may
> get to the PIC and kill it), and large enough to limit current through
> the zener when/if it does break down
>
> Probably 5mA would be enough through the zener to keep it
> regulating, but you'd have to check its datasheet, and also have a
> think about how high the careless Vin might be to determine the
> resistor and zener wattage rating
>
> http://www.opamplabs.com/zenerreg.htm
>
> For example, enter 10 (volts in), 4.7 (zener voltage), 10 (mA load)
> and click Solve -> 265ohms 0.1W resistor, 0.1W zener
>
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