Page 43 - The Basics IA by ETron Circuit Labs

You will notice that LED 1 and LED 2 are on about the same amount of time. The speed of the blinking can be adjusted by changing values of R1, R2, and C1. As you change these values, you will also change the duty-cycle, unless you maintain a certain ratio between the values.The formula for changing these values is available on Lab 15 (Page 28-29).Procedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and you should see the LEDs lighting up, one after the other, like a railroad crossing.Check Your Work Here a b c d e 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 a b c d e f g h i j 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 f g h i j Here’s What You’ll Need...R3R4 hole 6iRESISTORhole 6ehole 19h220 Ohm - (Red, Red, Brown, Gold)hole 19chole 19j220 Ohm - (Red, Red, Brown, Gold)R1R2hole 20bhole 21b6.8K & (Blue, Gray, Red, Gold) C1ELECTROLYTIC CAPACITORS hole 21h10uF hole 20hAnode CathodeLIGHT EMITTING DIODE (LED)LED 1Cathode (flat side)LED 2Cathode (flat side)hole 7bhole 6b hole 6ihole 7iIC 1INTEGRATED CIRCUITB1red = hole 30e black = hole 30h8 7 6 5 holes21e-18e1234WIRESW1 = 21a & 30a W2 = 7c & 21c W3 = 21j & 30j W4 = 7i & 21i W5 = 18g & 21d W6 = 20g & 19bhole 20c33K $ (Orange, Orange, Orange, Gold) holes 21f - 18fREDBLACKSCAN HERE TO SEE MORE ONLINE41LAB 21Anode AnodeVisit us online at www.ETronCircuit.com for more exciting projectsLab Observations