- Joined Jun 12, 2019
I don't know the part number, what does a switched lug do? I just need it to run on 12v dc - I have the matching parts here, so no worries thereCenter is often positive, but not always. One of the other two lugs is probably switched.
If you know the part number, it is easy to look up. If not, use a diode tester/ohmmeter on the other two contacts.
Unfortunately, what you show do not appear to be a mating pair, as both have male threads.
Why should that be the negative lead? Center pin is not always positive. In most circuits, you can switch the negative or the positive. You can design it either way and some very big manufacturers make the center (not switched) lead negative. It is often easier or at least convention to switch positive.So as long as I find the prong that is connected/ shorted to a second one, that will be negative? The device I want to supply with power has no internal battery, if I wire the two shorted together it should (technically) work fine?
I don't have a schematic at the moment. Basically it is just 12v dc that will power a circuit board. I simply wanted a plug in the cable. I'm just confused because of the three prongs, I guess.Why should that be the negative lead? Center pin is not always positive. In most circuits, you can switch the negative or the positive. You can design it either way and some very big manufacturers make the center (not switched) lead negative. It is often easier or at least convention to switch positive.
What don't you understand? Please post a schematic of what you want to do.
Yes - that way gives you certainty. Plug in the power unit you are going to use and you will measure voltage between two pins and they are the ones to use - you will also see the actual polarity. Leave the third pin unconnected.Easiest would be to just plug it into a live cable and test with the multimeter which side is pos?
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by Jake Hertz
by Jake Hertz