How much damage did I do?

[Flecko]

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

[Captain_Hastings]

Erm... didn't you use a bridge rectifier or diode in front of the 7805?

[Flecko]

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

[Guest analouge]

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

[Flecko]

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