enigma1406

I'm building a circuit to turn a momentary switch into a latching switch. That part I think I have down pretty well. My problem now is where I'll be getting the power from. I need a 12v line and it will use close to, but less than 1A.

I'll be powering some LEDs, so will I have to worry about regulating the voltage? I've read that the voltage on some car lines gets up to 100v. Is this true?

Also, can I just tap off of a fuse in the fuse box and not have to worry about regulating the voltage or using an inline fuse? Thanks for the help.

If you have any suggestions on what line to tap that would be appreciated. This is a switch that I bought from nsxjr, so it will be going next to the passenger airbag light and I'll have access to all of the center console wiring.

Thanks.

MacSub

Depends on whether you need permanent live or ignition on live, but there are plenty of fuses that provide one or the other. It's always wise to put in an inline fuse regardless of where you're getting the power.

broke90

and will be in the usual 12-14V range.

LEDs need current limiting - not voltage so much. You will need to know the current draw of the LED and match a resistor to it (in line). Google current and LED for calculation details.

enigma1406

Thanks. The LEDs already have resistors in place. I've tested them with a 12V battery and everything works, so my main concern now is getting the switch to latch and getting power.

I was pretty much set to try everything out and then a couple people mentioned that I would need voltage regulation and they got me scared! Maybe they thought I was getting power from the alternator/battery directly?

I'll definitely have a fuse in place to limit current. Thanks.

enigma1406

I'm going for live on ignition I think. I doubt I'll want to turn on the LEDs when the key isn't in the ignition, plus that'll prevent me from leaving them on.

The fuse will definitely be done. Thanks for the reply.