Grrrr... 5v 3amp Regulator with control pin

[JayTheVapingGuy]

So,

I'm midway through my third mod... figure, hey, might as well try doing a 5V mod... all i have so far is stuff that runs at just over 3.7v...

So i head out to the store, pick up all my supplies, including a 5v 1amp Regulator...

get home and i spent the first hour or so mentally placing everything, then i carefully carve holes (i don't have fancy tools) for all the pieces... now i have my batteries in place, i have my 510 connector in place, and i have my horn momentary push button in place... start connecting things and noted... HRRRMMM>>> why do all the diagrams have 4 poles coming from the regulator...

whoops... apparently i didn't get a 5V 3amp Regulator with a control pin that all the diagrams i can find are calling for

is this fixable tonight... do i need to have the control pin variant or can i run this a different way??

help???

Jay

 

[emus]

Can you download a spec sheet for your 3? amp regulator?

 

[WillyB]

So i head out to the store, pick up all my supplies, including a 5v 1amp Regulator..

1A... useless. Toss it.

and i have my horn momentary push button in place...

With a switch like that you don't need a 4th pin/control pin. Switching the main Vin with your horn will make for an easier to build and more efficient mod.

Here's the basic layout (can't remember who drew up the original) for a linear reg.

The blue X's are where you could place a master/kill switch (pick one). Throw a heat sink on the reg, it don't have to be fancy. Do check out the datasheet on the reg you choose for the correct pin-out.

 

[JayTheVapingGuy]

why is 1a useless?

 

[CBB]

At 5v with a 3 ohm atty you will draw 1.7 amps even more with a lower resistance atty it will over heat the regulator and shut it off or burn it out.

 

[breaktru]

1A... useless. Toss it.

I concur............

 

[emus]

I concur....

 

[JayTheVapingGuy]

Roger! Will promptly throw it out( or turn it into an ornament for the Christmas tree)

 

[Dalton63841]

1A will be fine if you intend to replace it with a properly sized reg soon. I successfully used a 1A 7805 reg for about 3 weeks in one of my first box mods. They do get pretty hot though, but if it's all you have, it will work till you can replace it.

 

[JayTheVapingGuy]

and work it has!!

my first 5v box mod is alive!!

yay me... does get hot though... might put some holes in the box to give it air

 

[emus]

and the biggest heat sink that will fit.

 

[JayTheVapingGuy]

ok... what do i use for the heatsink?

 

[emus]

I rob aluminum heat sinks off old computer power supplies.
You want as much surface area possible.
That's why heat sinks often have fins.
Copper works good also.
Should use heat sink paste like the paste used on CPUs.
Apply paste to regulator metal interface only.