Post #2: "simply put a rectifier diode in"
Post #7: "add the diode OR a low value resistor"
Post #14: "It's either/or."
Post #18: "No, not both; just use a diode."
Post #20: "They limit the same thing...

 

Sorry for so many questions. So a diode only allows a certain amount of current to pass through? Don't you also need to take into account the voltage difference?

 

See my previous post. I've been editing it for a while.

 

Thanks for the help!

 

Sorry for so many questions. So a diode only allows a certain amount of current to pass through? Don't you also need to take into account the voltage difference?

Diodes are sort of magical in this regard. They'll sit their dropping 0.6-0.7V at almost any current level passing thru them, up to the rated current where they'll go poof. That's why a diode is a good "regulator" in your application; it'll drop the voltage in a predictable way (almost) no matter what your lights need.

The voltage drop across a resistor, on the other hand, depends on the current passing thru it (Ohm's law). No current = no voltage drop. So in your application, using the resistor requires a bit of knowledge on your part - the current drawn by your lights. You should be able to find a specification for your light string, but a measurement made with a meter is even better.

 

If it runs on 3AAs it is likely under 1A.

Bob