Page 65 - The Basics IA by ETron Circuit Labs

oscillator turns off. The 10 Ohm resistor prevents too much current from flowing in the speaker.Procedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and there should be no sound emitting from the speaker. Now, find a dark location and put this circuit in it. The speaker should put out a high-pitched sound. As soon as you turn on the lights, the sound will stop. This is fun as a game. Hide the insanity alarm in a room and turn out the lights and see who can find it.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...R2 R3 R1RESISTORhole 15jhole 30j10 Ohm ' (Brown, Black, Black, Gold) hole 21dhole 29d47 Ohm ' (Yellow, Violet, Black, Gold) hole 14e220 Ohm - (Red, Red, Brown, Gold)hole 30iQ1C1 104P1c beNPN TRANSISTOREmitter hole 14de cDISC CAPACITORShole 15e hole 7ehole 15b hole 30g0.1uFPHOTOCELLNPN 2N3904Collector hole 16dBase hole 15dQ2bPNP TRANSISTORPNP 2N3906Emitter hole 9dBase hole 8dCollector hole 7dREDBLACKB1red = hole 29e black = hole 30fWIRESW1 = 9b & 29a W2 = 8c & 16cPOTENTIOMETER R2hole 15a hole 21anot usedSPKR 1hole 15i hole 7aSPEAKERSCAN HERE TO SEE MORE ONLINE63LAB 32Visit us online at www.ETronCircuit.com for more exciting projectsLab Observations