Page 39 - The Basics IA by ETron Circuit Labs

The full musical tempo ranger should be able to be reached by adjusting the potentiometer from one extreme to the other.Procedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and you should hear a tic-tic sound in the speaker. If you hear only one click from the speaker, twist the potentiometer shaft from one extreme to the other until you hear the tic-tic sound.The speed of the tics can be adjusted using the 100k potentiometer. You can adjust this to keep time to the music just like you would do with the standard mechanical metronome.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 12bBase hole 11bNPN TRANSISTOREmitter hole 10bPNP 2N3906Q2e cbPNP TRANSISTOREmitter hole 9cBase hole 8cCollector hole 7cPOTENTIOMETER R2hole 11a hole 20bnot usedC1100uFhole 7ehole 11ehole 7d hole 15iB1REDBLACKred = hole 29e black = hole 30fELECTROLYTIC CAPACITORSSPKR 1SPEAKERWIRESW1 = 9a & 29a W2 = 10e & 30h W3 = 15j & 30j W4 = 12e & 8eSCAN HERE TO SEE MORE ONLINE37Visit us online at www.ETronCircuit.com for more exciting projectsLAB 19Lab Observations