Introduction: Two Tone Doorbell Using IC 555

About: There were 1000+ sperms but I was the fastest one..

Saw someone selling a two tone buzzer on Aliexpress for $10. Immediately my brain said, are you serious?

Just by investing a little bit of your time and enthusiasm you can make this circuit for under 3 dollars.

Step 1: Components Used

For this project we need:

  • 1 x 555 Timer IC
  • 1 x Pushbutton Switch
  • 2 x 1N4148 Diodes
  • 1 x 10μF Capacitor
  • 2 x Ceramic Capacitors (103)
  • 4 x 47K Resistors
  • 1 x 8Ω Speaker

Step 2: Schema

So, this is the simple schematic of the two tone buzzer circuit using the 555 timer IC.

Step 3: The Board

And, this is how my board looks like.

The link to the gerber file is here:

You can also download it from my website or my blog:

Step 4: Assembly

Lets start the project by soldering the 4, 47K resistors to the board. Then, lets solder the 2, 1N4148 Diodes to the board. After that I am soldering the 2 ceramic capacitors to the board. Next, I am soldering the 10μF Capacitor followed by the base of the 555 timer IC. Finally, I am soldering the male female pin-headers to the board. It really doesn't matter what order you solder the components to the board; however, putting the small components first makes the process a bit easy.

Once all the components are in place its time to install the IC to the base, that's it all done.

Step 5: Demo

By pressing the push button switch you can now produce the two tones from the 8Ω Speaker attached to the pin headers.

Step 6: Thanks

Thanks again for checking my post. I hope it helps you.

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Full Blog Post:

Gerber File: