I accidentally hooked an AC power supply(13v, 200ma) up to my PIC project. It is running into a 7805. The system seemed to be getting power, and it wasn’t until I realized it wasn’t working that the power supply was AC.
I left my DC one at my moms house and so I grabbed one I had laying around here before realizing what an idiot I am.
What parts could this potentially ruin? i had a 30 dollar LCD hooked up? Anyone?
I guess I’ll find out when I get the DC supply.
Thanks all,
-Flecko
Erm… didn’t you use a bridge rectifier or diode in front of the 7805?
Nope, never needed to before. Its just the 7805 running power straight into my circuit.
I’m an idiot. Hopefully the negative side of the ac didn’t hurt my circuit. Otherwise, I was thinking this might not be so bad.
-Flecko
why not just a rectifier before the curcuit always in the projects - then it doesn’t matter if it’s AC or DC you feed it with? Am I right? Correct me if not… 
Do this especially when working with pretty expensive parts like the PIC and LCD… Good luck!
Ingebret
Well, the pic was unharmed. Not sure about my SID or my LCD yet, but at least the circuit works again, despite my stupidity.
I thnk from now on I’ll have some safety diodes in place.
Thanks everyone,
-Flecko