> Hi,
>
> I have a very small project on my desk: A tone generator which should
> produce a simple meldody, has to check a key press and light 2 LEDs. No
> deal
> at all BUT cost is a major factor. When checking the prices I found, that
> the voltage regulator's price is in about the same region as the PIC
> itself,
> which lead me to the question: Are there any micro controllers which can
> be
> operated directly at an unregulated 12V supply?
>
> Thanks for enlighten me and best regards
>
> Peter


There is the HV series of PICs, which, if I recall correctly, include a
shunt regulator (perhaps a zener). I recently did a project where the
device was VERY cost sensitive and had to be powered off an automotive
supply. After looking at various alternatives, I put in a 5V zener and a
couple series resistors. Also, a pretty large capacitor across the zener.
That provides reverse battery protection, load dump protection, etc. at a
pretty low cost.

Harold


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