Passengers talk about the Pennsylvanian, an Amtrak passenger train that runs between Pittsburgh and Philadelphia. It was announced that the line may cease in October of 2013. (Video by Michael Henninger; 2/17/2013). think it would be worth it for Amtrak and PennDOT to see if more schedule diversity might make it a more popular travel option, Ms. Katchmar says. â¢ Go to post-gazette.com for a slideshow of photos taken aboard the Pennsylvanian and a video report. Jon Schmitz: jschmitz@post-gazette.com or 412-263-1868.
A light-emitting diode (LED) is a semiconductor device that creates light using solid-state electronics. A diode is composed of a layer of electron rich material separated by a layer of electron deficient material which forms a junction.
How to Build an LED flasher circuit. In this project, we will show how to build a simple LED flasher circuit using a 555 timer chip. An LED flasher circuit is a circuit which flashes the LED-meaning turns it ON-OFF, ON-OFF, ON-OFF.e can slightly modify the circuit above so that it flashes 2 LEDs. The LEDs will flash alternatively. As one flashes on, the other flashes off. This happens pretty quickly but it still can be seen with the human eye. Additional Parts. 1  1Kâ¦ Resistor. 2  Red LED.