In this video I describe how I light my N-scale buildings with small LEDs (light-emitting diodes). The circuits are simple, using only the diode, one resistor, and connecting wire. They require small DC power supplies on the order of 5 to 18 volts. the higher the voltage used, the higher the resistance value is needed because current must be limited to less than 20 mA. I give suggested resistance values in the video.

In the video, I give references to eBay ads where you can buy the LEDs and resistors for a few cents each.

Here are the chapters of this video
00:00 Introduction
0:27 A Simple Circuit
1:06 Kinds of LEDs
1:33 Resistors
1:41 Soldering a Light-Stick
4:43 Small DC-DC Power Supply
4:58 DC Wall Wart
5:06 Facia Mounting
5:16 Circuit
5:43 Voltage Table
6:01 My Examples
6:30 End