DNA 12 and LEDs

[MidniteMarauder]

Is it possible to wire an external led for the fire button with the dna? If it is I can't seem to figure it out lol. Any help is greatly appreciated.

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[MattBott]

I would assume you could put on in series with your switch. Putting a voltmeter on the posts of my switch, I get 1.95 volts. I haven't worked with LEDs in a long time (I'm not a fan of them in mods) so I can't remember if this is underpowered for them or not.

 

[MidniteMarauder]

Tried that and got a light when not pushed and no light when pushed. Reversed and was the same. Thanks though.

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[Lance_Wallen]

The switch on a dna mod doesn't pass the voltage, it triggers the mosfet on the board. If you check both poles of your switch when it's not triggered you'll see ~2v, push the switch and it goes to 0 because it's triggering the mosfet on the board and voltage is now going through that. That's why you can use any rating switch on a DNA board, because it doesn't pass line voltage at any point, it doesn't have to be rated.

The only place I can see you putting an LED would be on the atty line but that's going to have it's own set of issues, namely the fact that it's not a constant voltage and it'd effect the readings the board gets when it checks the resistance of your coil. I think you might be SOL on that one.

 

[MattBott]

You could get a switch with two +/- posts and one pair for the DNA and another for battery + LED

 

[Lance_Wallen]

yeah, matts right... you could technically add a small battery. An LED will fire off of pretty low voltage, a little watch battery would last a real long time. I don't know what effect it would have on the mosfet though if you triggered the switch and it dumped voltage into it from the watch battery/led circuit... I suppose if the switch fired two independant channels without cross over it'd be fine.

 

[MattBott]

I'm thinking single battery. Not 100% it will work, but here's a quick paint drawing:

The type of switch needed is DPST (double post / single throw). Check the wikipedia page for switches for a little more info.