This regulator seems to be the answer .5v dropout and the drop curve shows 12v @ 12v after that it drops as voltage drops and 2amp output. And they have a on/off pin so it can be turned on remotely. http://www.digikey.ca/product-search...on=on&x=13&y=9 I have some on order, I will let you know how they work out. SNO
Last edited by SNOtwistR; 09-27-2013 at 10:07 PM.
Sno That one looks far superior..good find...forgot to say I'm running dual batterys in a 4x4 so i dont have to deal with voltage drop and a flat starter battery..so my setup may differ from everyone's else's...
Good size heatsink to people if your trimming a few volts the regulator will heat up and you don't want this..see pic.
The heat sink is too small.
In addition, you have to use 2 capacitors 100nF multilayer and two electrolytic capacitors to filter correctly dirt ...
+12\14v --- 1000uF/25v---100nF---7805--100nF--470uF\16v
Good idea use a VDR 17v after +12\14v
Yeah, trying to drop 7-9VDC with that 7805 at 1.5 to 2A causes power dissipation on the 7805 to be roughly 10 to 19 Watts. The fairchild datasheet does say anything about max power dissipation. However, the device suggested by SNO says an unheatsinked power dissipation of 1.4 watts, and 15 Watts with an infinite heatsink (That would be HUGE, by my guess). Since the case size is the same, TO220, I would not imagine that the 7805 can't dissipate that 10-19Watts without a large heatsink, hence the black circuit board in the pic.