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Project Notes

#051 El Jarabe Tapatío - The Mexican Hat Dance

Play The Mexican Hat Dance on a piezo buzzer! Here’s a quick demo:



A simplified version of the melody in scored in this GuitarPro file. It is the basis of the song played by the sketch.


The signal from the Arduino can be directly fed to a piezo, however this doesn’t result in a very loud sound.

This circuit uses an LM 386 Low Voltage Audio Power Amplifier as a simple way to amplify the AC signal. Given that we are only interested in the alternating signal, the amplifier input and output signals are isolated with capacitors. The LM 386 is used in the default configuration, which results in a relatively low gain (x20) but that is sufficient for our purposes here.


The Breadboard

The Schematic

The Build

Credits and References

Project Source on GitHub Project Gallery Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects. Two main themes have emerged in recent years, sometimes combined:

  • electronics - usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.