Forum Thread: Two Tone Doorbell Using IC 555

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.

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 8O Speaker


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

The Board

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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:


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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.


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


Thanks again for checking my post. I hope it helps you.
If you want to support me subscribe to my YouTube Channel:
Full Blog Post:
Gerber File:

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Thanks, ca again in my next tutorial.


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