Page 35 - The Basics IA by ETron Circuit Labs

The more current passing through the transistor, the more current running through the LEDs. The more current through the LEDs, the brighter they shine.Procedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and observe the two LEDs. This circuit causes the LEDs to be brightest during the night and dimmest during the day.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...R1 R2Q1eRESISTORhole 7a47 Ohm ' (Yellow, Violet, Black, Gold) hole 6dc bNPN 2N3904Collector hole 3gBase Emitter hole 2g hole 1gNPN TRANSISTORPOTENTIOMETER R3hole 2h hole 6e not usedAnode CathodeLIGHT EMITTING DIODE (LED)LED 1Cathode (flat side)LED 2Cathode (flat side)hole 7c hole 5chole 5a hole 3ahole 2i hole 5ihole 19ahole 19d16K % (Brown, Blue, Orange, Gold) PHOTOCELLP1B1red = hole 19e black = hole 22fWIRESW1 = 5h & 22g W2 = 1j & 5j W3 = 3e & 3fREDBLACKSCAN HERE TO SEE MORE ONLINE33LAB 17AnodeAnodeVisit us online at www.ETronCircuit.com for more exciting projectsDid you know...This is the type of circuit that will act like an automatic security system. When the room gets dark, the LEDs light up.