Page 42 - The Basics IA by ETron Circuit Labs

ETron Circuit LabsLab 21 Railroad Crossing LightsObjective:In this Lab you will build a circuit that imitates lights that you would see at a Railroad Crossing.Step 1 – Take InventoryUsing the Parts Inventory as shown on the right under the “Here’s What You’ll Need” section, place each part needed for this experiment on its corresponding drawing. Observe the schematic symbol for each part. Make sure that you have all the parts ready before you begin Step 2.Step 2 – Build the CircuitUsing the Schematic Diagram and the picture of the completed lab, build the lab experiment with the electronic components. Use the “Check Your Work Here” Box to verify that your wiring is correct, and then proceed to Step 3.Step 3 – Do ExperimentTheory:Here you will will use the 555 Timer IC as a “clock” with a 50% duty-cycle. That means that the amount of time Pin 3 of the 555 Timer IC is HI is the same amount of time it is LO.40