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 8Ω Speaker


Schema
---------

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


The Board
---------------

And, this is how my board looks like. 

The link to the gerber file is here: http://scorphq.com/GrpHDD/GerberFiles/Gerber_Door_... 

You can also download it from my website or my blog: http://diy-projects4u.blogspot.com/


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.


Demo
------

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

Thanks
----------

Thanks again for checking my post. I hope it helps you.
If you want to support me subscribe to my YouTube Channel: https://www.youtube.com/user/tarantula3
Video:
Full Blog Post: https://diy-projects4u.blogspot.com/2020/09/two-tone-doorbell-using-ic-555.html
Gerber File: http://scorphq.com/GrpHDD/GerberFiles/Gerber_Door_Bell_V1.zip

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Thanks, ca again in my next tutorial.