On Wed, 25 Oct 2006 17:45:32 +0100, you wrote:

>Hope this counts as PIC, not EE
>
>I've seen circuits for very simple, efficient, transformerless,
>non-isolated power supplies such as
>http://www.aaroncake.net/circuits/supply5.htm .
>
>Would I have a chance of running a very low frequency PIC16 on this
>type of supply? would i need to stick a 7805 in too? or is it simply
>too noisy?
>
>thanks
>
>jon

You can get a few mA out of circuits like this, so possible to run PICs at normal clock rates,
obviously you'd use a 5V1 zener instead of 11V. 
You'll want to add a little bit of series R (~100R fusible) to limit inrush current if it's plugged
in at the top of the cycle.



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