Can you run enough LED's in series to not need a resistor?

[Frank]

I just copied and pasted, found out it was Russian, as I suspected. Then searched for a Russian to English translation.

The reference to the ladder was the intriguing part of the mystery.

I learn something new every day: https://en.wikipedia.org/wiki/Resistor_ladder .
I doubt that it's applicable to this particular problem. But, it is kind of interesting.

 

[MikeGTW]

might help a little http://led.linear1.org/led.wiz

 

[KB02]

The ladder reference make more sense now, after looking at those links - the reference, not the concept. I'm a lot like Bob:

I can wire a house, but electronics is something I have to do research on before I do anything physical.

I just can't seem to wrap my head around basic electrical theory... but I'm getting better.

http://led.linear1.org/led.wiz

That's a handy link. Thanks for sharing, Mike!

 

[Frank]

The ladder reference make more sense now, after looking at those links - the reference, not the concept. I'm a lot like Bob:

I just can't seem to wrap my head around basic electrical theory... but I'm getting better.

http://led.linear1.org/led.wiz

That's a handy link. Thanks for sharing, Mike!

Basic electrical theory isn't that bad for this stuff. This is mostly DC circuits with resistors, diodes, batteries and the like. There may be the occasional capacitor, but usually not. And if you don't need to worry about partially charged capacitors, they're not to bad either.

The usual analogies involve water flow. You can build your own simulator out of tubes, jars and pumps that goes a long way towards understanding it. That won't help with more advanced systems like AC or induction, but you're probably not going to need that for railroads.