Two-LED Flasher Kit
The Two-LED Flasher kit is a very basic kit and it does nothing more (or _ less) than blink one LED and then the other. The back and forth flashing is reminiscent of a railroad cross signal light, and many times it is used by model railroaders for that purpose. Simple bi-stable oscillator circuit; operates on 3 VDC and two AA Cells will last for weeks. You can change out some of the components for faster and slower, details in the instructions. Two-LED Flasher