Page 41 - The Basics IA by ETron Circuit Labs
P. 41
down. If you have an oscilloscope, you will enjoy observing the interesting wave form passing through the speaker.Procedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and rotate the shaft of the potentiometer to hear different sounds in the speaker. The resistors and capacitor have been chosen to give the approximate sound of a two-cycle engine like the ones used on some motorcycles.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...RESISTORR1Q1ehole 20chole 29c3.3K % (Orange, Orange, Red, Gold) c bNPN 2N3904Collector hole 16gBase hole 15gNPN TRANSISTOREmitter hole 14gPNP 2N3906Q2e cbPNP TRANSISTOREmitter hole 11gBase hole 10gCollector hole 9gPOTENTIOMETER R2hole 15f hole 20anot usedC110uFSPEAKERWIRESW1 = 19a & 29a W2 = 14i & 30j W3 = 11f & 19c W4 = 10h & 16hhole 9ihole 15iB1red = hole 29e black = hole 30fELECTROLYTIC CAPACITORSSPKR 1hole 9j hole 14jREDBLACKSCAN HERE TO SEE MORE ONLINE39Visit us online at www.ETronCircuit.com for more exciting projectsLab ObservationsLAB 20
