7805

[Argelfraster]

I'm using my 7.4V batteries and a 7805 regulator to power an NES. The NES didn't work the first time I turned it on so I checked the voltage coming out of the regulator to see if it was 5V.
It came out as 7.3 or so.
I tried another regulator; again it came out as 7.3-7.4.
Whats wrong?

 

[desmin88]

Do you have it hooked up right?

With the pins facing you, the left one is Unregulated, middle is Ground, right is regulated.

 

[Argelfraster]

Yes I have it hooked up right.

 

[seanmacdonn]

Take a picture because something is obviously wrong. (Unless you got two bad 7805's)

 

[muchalucha]

are they used 7805's? WHen you pull to many amps tyhrough them they die and this has heppend to me a few times.

 

[bassmasta]

are they used 7805's? WHen you pull to many amps tyhrough them they die and this has heppend to me a few times.

They have an automatic thermal shutdown mechanism. You have to heatsink them.

 

[Hrduncan]

Use three of them in a series and heatsink them keeps a constant voltage and amperage

 

[Argelfraster]

How do I wire them in series?

 

[Mako321]

You mean getting more amperage by wiring them together, by having them piggybacked on each other?(connecting the same pins to each other, like v in to v in)

 

[Hrduncan]

yah just wire it v in to v in to vin and v out to v out to v out and ground and they seem to work good i needed them for my portable n64 because i had to put 5v into a regulator that would increase the voltage to 10.8v to run the screen i was using

 

[Mako321]

You do know how efficient that is, right?