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Help with Diagram

MKPM

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First question is....what is the purpose of the LED?
 

MKPM

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If it is to be always on....then between the MOSFET and the switch....but make sure that the LED can handle the load. I have seen many LED fire buttons not handle the pulse load. I would test it under load before drilling your hole and permanently affixing it to the box. test using a pair of 35amp pulse freshly charged batteries.
 
If it is to be always on....then between the MOSFET and the switch....but make sure that the LED can handle the load. I have seen many LED fire buttons not handle the pulse load. I would test it under load before drilling your hole and permanently affixing it to the box. test using a pair of 35amp pulse freshly charged batteries.

I want it to only be on when i press the switch. How would I do that?
 

MKPM

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Between the switch and connector.....but no LED that I am aware of can handle that load. You would not be able to see it of course.
 

Jackson

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What if i used a 470 ohm resistor?
I'd go bigger ~500+Ω, but that will depend on the LED, I imagine you want a glow and not a flashlite.

Here's a diagram for you.

BM_LED.png


The resistor can go on either leg. The wires from the switch to the mosfet carry hardly any current, you can use thinner (and much easier to work with) wires, no reason to fumble around with 14AWG. Also avoid the temptation to cover the mosfet itself (a heat producing semiconductor) in an insulating layer of heat shrink. And do add a few holes in the bottom of the enclosure.
 

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