At 10:45 AM 10/25/2006, slippyr4 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? Yes. Do note that the schematic as presented is missing a current limit resistor in series with the input capacitor (I normally draw mine in series with the bottom AC input line, underneath C1). The PIC supply can simply be another zener supply: input resistor of about 470R feeding a 5.1V zener diode. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 22 years of Engineering Innovation (1984 - 2006) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist