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Topic: Red LEDs with reverse polarity! (and ?) (Read 688 times) previous topic - next topic

Peter_I

I scrounged some red LEDs from bike lights I've found (when the snow melts they are all over the place).

LEDs are cheap, but I'm cheaper and I like to "recycle" components.


But some of these LEDs are a bit annoying.
They look like normal clear plastic LEDs, but the leg connected to "the smaller piece of metal" inside it is not the positive, but the negative leg!
It has a flat side that correctly denotes the negative leg, but they have fooled me a couple of times anyway.

Do any of you know more about these? Is there a good reason or is it just a production error that has been sold to the bike light factory?
Bob Pease: "My favorite programming language is ... solder."

CrossRoads

Boffin1 purchased a batch of "reverse polarity" LEDs a while back.  Maybe yours are part of that same batch ;)
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

retrolefty

I always check the proper polarity of LEDs just before I solder them in with a multimeter, I just don't trust my memory or all manufactures.  ;)

Lefty

fungus


It has a flat side that correctly denotes the negative leg, but they have fooled me a couple of times anyway.


The flat side is what you're supposed to use to identify LEDs, not the metal inside.
No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

Zapro


I always check the proper polarity of LEDs just before I solder them in with a multimeter, I just don't trust my memory or all manufactures.  ;)


Good job soldering LED's with a Multimeter  :)

// Per.

retrolefty



I always check the proper polarity of LEDs just before I solder them in with a multimeter, I just don't trust my memory or all manufactures.  ;)


Good job soldering LED's with a Multimeter  :)

// Per.


Yea, I did butcher that one a little, didn't I?  ;)

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