7805's Fried on FC Twin

Billybb347 · Post by **Billybb347** » Thu Mar 29, 2007 5:21 pm

Which one of the 7805s is the one to the SNES part of the board?
I only have one extra 7805 and both of the 7805's have fried (I think) from an accidental placement of the batteries backwards.

vskid · Post by **vskid** » Thu Mar 29, 2007 5:25 pm

One 7805 should be able to power the whole thing, heat displacement might be a problem though.

Post by **CronoTriggerfan** » Thu Mar 29, 2007 5:34 pm

vskid wrote:One 7805 should be able to power the whole thing, heat displacement might be a problem though.

Yeah, make sure you have an efficient heatsink; it wouldn't hurt to throw in a small fan either, plus it'd look pretty cool.

CTFan

Billybb347 · Post by **Billybb347** » Fri Mar 30, 2007 6:17 am

vskid wrote:One 7805 should be able to power the whole thing, heat displacement might be a problem though.

Yeah but there's two I don't know which one is hoked up to the SNES part of the baord and which is hooked up to the NES part of the board.

ATOMICMAN · Post by **ATOMICMAN** » Fri Mar 30, 2007 7:10 am

they are pretty easy to trace. follow them all the way back on it.

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Fri Mar 30, 2007 12:23 pm

the one on the left is used for the snes portion

the one on the left when you can read the writing on it t5hat is

Billybb347 · Post by **Billybb347** » Fri Mar 30, 2007 2:23 pm

Turbo Tax 1.0 wrote:the one on the left is used for the snes portion

the one on the left when you can read the writing on it t5hat is

Let me make sure: Left meaning when I'm looking at the Heatsink not the Chips (and the A/V outputs)?

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Fri Mar 30, 2007 9:14 pm

left when the heatsink is on and you can ee the actual 7805s

Billybb347 · Post by **Billybb347** » Sat Mar 31, 2007 10:21 am

k cool thx

Epicenter · Post by **Epicenter** » Tue Apr 03, 2007 9:18 pm

If you try to run it all off one 7805, I wouldn't recommend a fan, just a decent heatsink. Those parts can run very very hot without a problem, and a fan introduces EMI that might cause instability.

Kurt_ · Post by **Kurt_** » Wed Apr 04, 2007 4:24 pm

For my portable, I am using a PSOne screen. One of the regulators broke, so both are connected to each other in parallel. I also am running a SNES and seperate audio amp off of it, and The PSOne screen's thin sheet of copper and a piece of cardboard with 22 gauge wire threaded through it is plenty to keep to heat at bay.

Felino · Post by **Felino** » Sat Apr 07, 2007 12:58 am

But, 7805's are reverse protected, thermal protected, and bash protected! I havn't been able to kill one yet.

Kurt_ · Post by **Kurt_** » Sat Apr 07, 2007 10:03 am

You are quite right. He probably DIDN'T fry them at all. He either blew a fuse, or worse!

Billybb347 · Post by **Billybb347** » Sat Apr 07, 2007 12:09 pm

Kurt_ wrote:You are quite right. He probably DIDN'T fry them at all. He either blew a fuse, or worse!

/sarcasm

Your right I don't know if its the 7805's that fried but since I didn't hear anything snap crackle or pop, I thought replacing them would be a good place to start.

XBrav · Post by **XBrav** » Mon Apr 09, 2007 4:22 pm

Well if the SNES is not working... quote me if I'm wrong but that little black guy close to power labelled 1.5A is a 1.5A fuse?

Just remember the heatsink used in SNES revision 1 for the regulator was seriously a casing covering half the board...