I got a question and I really need answer

[Kgb424]

I'm going to build a DNA30 mod my self, and I was looking at the DNA30 chip spec's and it says


Minimum/ Recommended/ Maximum


Battery 22G 20G 20G

Output 24G 20G 20G

Switches 28G 24G 20G

20 Gauge wire is rated 9 amps

18 Gauge wire is rated 13 amps

Is the reason that they say to use 20 gauge is, because 20 gauge its 9 amp load is closer to the 10 amps the DNA30 chip is rated for ?????????

Can I use 18 gauge or will it create too much heat, cause the load is higher at 13 amps or is it resistance that creates heat. I don't so I thought I asked

and should buy some fuses to prevent a overload or battery put in backwards

 

[Kgb424]

Cause I got my two DNA30 chips, fire buttons, tactical buttons, 18650 battery holders, sealed base type 510 connectors are coming, need to order the display holders, and too figure out what to use as a epoxy, and I found a Altoids tin, So I will see if I can get firing once I figure out what gauge of wire to use.

 

[p7willm]

The lower the gauge the bigger the wire. The bigger the wire the more current it will carry.

I think copper wire ampacity is 11 or 18 gauge and 16 for 20 gauge. The resistance is only about 30 ohms in a kilometer. Your problem is that if you push too many amps through a wire it will get hot.

Using a lower gauge, larger, wire will work just fine and, in fact, will be cooler. The problem is that it is thicker and sometimes harder to stuff in your mod.

Fuses are always a nice thing. They will blow on an overload, you should not have one but murphy's law. A fuse does nothing for you if you put the battery in backwards. The dna chip does not have reverse polarity protection because if it had it it could not do all the battery sensing it does. Provari puts a ring of insulation around the positive terminal and requires a button top to touch it.

 

[edyle]

like you said, its the resistance that creates the heat

 

[Kgb424]

Thanks for the input, I can not find stranded 20 gauge any where locally, I got some stranded 18 gauge wire, I use for my R/C's, but its black and red, but I do have different colored shrink tubing, for example the switch wires for the up button, use green shrink tubing on both ends, and the down button use yellow, and make a color code so you know what wires go where.

 

[Kgb424]

Ok I took a piece of 18 gauge, and it is too thick to fit in the wire mounting holes on the DNA chip, the wire on the battery holders fits loosely, its supposed to until you tin the wire and solder it to the chip. I think the wires on the battery holders are 20 gauge and now I know why there using 20 gauge. so I got to order some online some where, cause the Radio Shack close too me is a joke, there more into selling phones than electronic components like when they first open, they were competitive, now they don't give a #### , won't even order it for you. So screw them.

 

[dice57]

yeah, um, sure there's something to do about size and limitations, round holes and square pegs type of thing.

 

[Nomoreash]

18 gauge probably won't fit the holes on the board, even 20ga is snug. Other than that you can use 18 or even bigger if you want, have the room and can get it to fit.

I order mine here, good pricing, shipping is kinda high but I order several rolls at a time so it's not that bad.

http://www.allelectronics.com/make-a-store/category/825/wire/cable/1.html

 

[Kgb424]

I ordered some 20 gauge, I got five different colors. the 18 gauge would run a lot cooler cause it handles more amps, but I got heavy duty 18 gauge, its too rigid and stiff to fold neatly into a small mod space. 20 is more flexible.