Mike Harrison wrote:
> 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.
>
>
>
>   
I never saw the original post. Please contact me. You have to be careful 
with these, because power line spikes can cream your PS and PIC.
I have a commercial version of this with all the safeties needed to make 
use of it, supplying 10-15mA for an AC motor control using a PIC12C
device. Hundreds were made, been in the field working without a single 
failure after 3 years.

--Bob
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