Page 59 - The Basics IA by ETron Circuit Labs

Frequency = 1.44 Hz (R1 + R1 + R3)(C1)Switch S1 applies power to the circuit which causes the 555 Timer IC to emit pulses at the frequency controlled by the values of R1, R2, and C1. Transistor Q1 amplifies the strength of the pulses sent to the speaker.Procedure:Assemble the circuit and connect a 9-volt battery to the Battery Snap and by pressing switch S1, you can send Morse code. You should hear a tone from the speaker every time you press the pushbutton switch.Check Your Work HereHere’s What You’ll Need...RESISTORR4R3R1R2Q1ehole 29d hole 30cNPN 2N3904Collector hole 9gBase Emitter hole 8g hole 7ghole 8ahole 9a10 Ohm ' (Brown, Black, Black, Gold) hole 8ihole 19h220 Ohm - (Red, Red, Brown, Gold)hole 20bhole 21b1K $ (Brown, Black, Red, Gold) hole 19ahole 20a120K & (Brown, Red, Yellow, Gold) S1c b 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 NPN TRANSISTORC1103 0.01uFhole 20h hole 21hred = hole 29e black = hole 30fDISC CAPACITORSREDBLACKB1INTEGRATED CIRCUITSPEAKERIC 18 7 6 5 holes21e-18e SPKR 11234holes 21f - 18fWIRESW1 = 8c & 30a W2 = 21a & 30b W3 = 18g & 21d W4 = 20g & 19d W5 = 21a & 30i W6 = 7j & 30jSCAN HERE TO SEE MORE ONLINEhole 8bhole 9h57Visit us online at www.ETronCircuit.com for more exciting projectsDid you know...In the 1890’s, Morse Code began to be used extensively for early radio communication, before it was possible to transmit voice. Today Morse Code is used for medical purposes allowing handicapped people to tap or blink out a message that can be read by specialized computers.LAB 29