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  1. D

    LED vs Diodes

    I bought some new diodes. They only work in one direction, the old one was blown. Thanks to all.
  2. D

    LED vs Diodes

    Thanks for the replies. For some reason, when the lights were shipped from China, they left out the data sheet! The diode may in fact be shorted. I was experimenting around and "something smelled hot". It sounds like I may want to get new ones and put them in series to protect the LED...
  3. D

    LED vs Diodes

    It is my understanding a LED needs direct current to work. I have small LEDs which came from a 3v Walmart Christmas light string. I have a resistor in series and was going to put a small diode in series to protect the LED. I am using a 13v AC transformer. It doesn't make any...
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    Simple LED help please

    Thanks for the replies and the values shown in the suggestions. I think I'm getting closer to my target.
  5. D

    Simple LED help please

    By saying "across the LED" Is the diode in parallel with the LED and current going in the same direction? Will this limit some of the current and affect the resistor size?
  6. D

    Simple LED help please

    I'm about to my witts end on a simple project. I'm trying to install Radio Shack red blinking LEDs on my Lionel layout. They are rated at 20ma, 5 volts and I have a 13 volt AC power supply. From what I have learned, I need a 400ohm resistor and a DC power supply. Correct? Here...
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