555 Musical Circuit

Objective

Make a circuit with six pushbuttons that play musical notes.

Schematic

Final Result

Materials

Description	Amazon Link
22 AWG Solid Core Wire	https://www.amazon.com/gp/product/B088KQFHV7/
Pre-formed AWG 22 Solid Core Jumper Wires	https://www.amazon.com/gp/product/B0002H7AIG/
(1) 400 Point Solderless Breadboard	https://www.amazon.com/dp/product/B07PCJP9DY/
(1) 555 Timer IC	https://www.amazon.com/gp/product/B077BRB6W6/
(6) 2 Pin Momentary Tactile Pushbutton Switches	https://www.amazon.com/gp/product/B07WF76VHT/
(1) 20 kΩ Trimmer Potentiometer (trim pot) and (5) 5 kΩ Trimmer Potentiometers (trim pots)	https://www.amazon.com/gp/product/B09HJTGB7R/
(1) 1 kΩ Resistor	https://www.amazon.com/gp/product/B0185FIJ9A/
(1) 0.1 uF Ceramic Capacitor	https://www.amazon.com/gp/product/B094HRK8QX/
(1) 22 uF Electrolytic Capacitor	https://www.amazon.com/gp/product/B0B4DMWDDB/
(1) 9V Battery	https://www.amazon.com/s?k=9V+battery
(1) 9V Battery Connector	https://www.amazon.com/gp/product/B081ZRBDVW/
(1) 8 Ω Speaker	https://www.amazon.com/gp/product/B0177ABRQ6/
(2) Breadboard Alligator Clips - Gator to Male	https://www.amazon.com/gp/product/B07GVGGYJ7/

Visuals & Additional Information

555 Timer Diagram

555 Timer IC Pinout

555 Timer IC Datasheet

Assembly Instructions

Step 1

Insert the 555 Timer IC into the breadboard.

Step 2

Connect pin 1 to the ground rail.

Step 3

Insert the 100 nf ceramic capacitor between pin 2 and the ground rail.

Step 4

Connect pin 2 and pin 6.

Step 5

Connect pin 8 to the positive rail.

Step 6

Insert the 1 kΩ resistor between pin 7 and the positive rail.

Step 7

Connect pin 4 to the positive rail.

Step 8

Insert the six pushbuttons into the last column of the breadboard. On my breadboard, the last column is column j.

Step 9

Insert jumpers to connect pin 2 of each pushbutton.

Step 10

Insert the jumpers that will connect pin 1 of each pushbutton to the middle pin of each trimmer potentiometer.

Step 11

Use jumpers to connect the middle pin and pin 3 of each trim pot.

Step 12

Insert the 20 kΩ trim pot.

Step 13

Use a jumper to connect pin 7 to pin 1 of the 20 kΩ trim pot.

Step 14

Use a jumper to connect pin 6 to pin 2 of pushbutton 1.

Step 15

Insert the 5 kΩ trim pots.

Step 16

Insert the positive lead of the 22 uF electrolytic capacitor into column j.

Step 17

Connect the negative lead of the 22 uF electrolytic capacitor to the ground rail.

Step 18

Connect the gator clips to the 8 Ω speaker.

Step 19

Connect one wire of the gator to male jumper to pin 3 of the 555 Timer.

Step 20

Connect the other wire of the gator to male jumper to the positive lead of the 22 uF capacitor.

Step 21

Connect the negative lead of the 9V battery to the ground rail.

Step 22

Connect the positive lead of the 9V battery to the positive rail.

Step 23

Adjust the 20 kΩ trim pot until pushbutton 1 generates a frequency of approximately 440 Hz.

Step 24

Adjust the 5 kΩ trim pot until pushbutton 2 generates a frequency of approximately 392 Hz.

Step 25

Adjust the 5 kΩ trim pot until pushbutton 3 generates a frequency of approximately 349.23 Hz.

Step 26

Adjust the 5 kΩ trim pot until pushbutton 4 generates a frequency of approximately 329.63 Hz.

Step 27

Adjust the 5 kΩ trim pot until pushbutton 5 generates a frequency of approximately 293.66 Hz.

Step 28

Adjust the 5 kΩ trim pot until pushbutton 6 generates a frequency of approximately 261.63 Hz.

Created By

• Robert Stewart Jr.

Revision History

Date	Description	Version
JAN 05 2024	Started	Draft