Need some electrical help...

a reply to: Natas0114

To be safe, put an inline fuse holder with a 1 amp fuse in the lead between the battery and the pump. That way, if the pump develops a short, the fuse will blow instead of the wire going up in smoke!

a reply to: Natas0114

As an aside, the heat sink has to be on the outside of the box you put it in. If you want to waterproof the box and heatsink, use that stop leak spray stuff and spray everything. It makes a thin, but good seal against water and it still allows seams to be opened and boxes to be taken apart. The only problem is the potentiometer, not much you can do to seal that, but there are water resistant pots available with rubber o-rings on the control shaft.

ETA: Here's a simple schematic

LM117-12, LM317-12, LM7812, ua7812 are all basically the same. The LM317-12 and LM7812 in TO3 or T220 cases if I remember right have the same pinouts.

Cheers - Dave

a reply to: intrptr
#12 is good for 20 amps
# 16 is good for 10 amps
The pump pulls 1.2 amps use the leads that are on it. The 12 volt battery system should be fine for the pump that's rated 12 volts.

originally posted by: Nickn3
a reply to: intrptr
#12 is good for 20 amps
# 16 is good for 10 amps
The pump pulls 1.2 amps use the leads that are on it. The 12 volt battery system should be fine for the pump that's rated 12 volts.

Check, check