Creating sound is fun! In this circuit, you’ll build a musical instrument. It will have four buttons for playing different tones.
The circuit uses a 555 Timer to create a voltage that goes on and off repeatedly. To make sound you need a voltage that turns on and off repeatedly. But, you need the voltage to turn on and off really fast. Like a few thousand times a second.
The value of capacitor C1, resistor R1, and the resistance between pin 6 and 7 will set the tone of the sound. The pushbuttons have resistors in between them so that the resistance between pin 6 and 7 will be different depending on which button you push. This results in a different tone being played for each of the buttons.
If you want more than four buttons on your instrument, you can add more pushbuttons and resistors.
Here’s a video of the circuit I made:
The Circuit Diagram
Find the components used in the table below. Click here to buy the complete kit.
|R1||1 kΩ||Standard resistor|
|R2||10 kΩ||Standard resistor|
|R3-5||1 kΩ||Standard resistor|
|R6||100 Ω||Standard resistor|
|C1||0.1 μF||Non-polarized capacitor|
|U1||NE555||555 Timer IC|
|S1-S4||Momentary ON||Tactile Pushbutton|
|SPK1||8 Ω||Mini speaker|
Are You Stuck?
Let me know your questions and comments in the comment field below