The Electronic Engineer
Menu
  • Privacy Policy
  • Resume
Menu
RSS
Follow by Email
Facebook
Facebook
fb-share-icon
Twitter
Visit Us
Follow Me
Post on X
YouTube
YouTube

Livestream The Electronic Engineer

Posted on January 5, 2026 by Mark Donners

Testing OBS studio with the live feed of my Elegoo Carbon Black 3d printer.

…

Read more

boy boy boy boy boy

Robot Voice Box Ends The World With One Command!

Posted on September 21, 2025 by Mark Donners

https://www.instructables.com/Vocoder-With-Larson-Scanner-the-Sound-of-the-Cylon/
Check out this awesome Cylon Vocoder helmet project! It features a glowing red light and a robot voice. This cool battlestar galactica inspired prop also functions as a voice changer.

…

Read more

boy boy boy boy boy

The fastest audio analyzer on a single ESP32

Posted on October 31, 2024October 31, 2024 by Mark Donners

This is a real achievement. It is the fastest Audio Analyzer on a single ESP32. One ESP32 driving 3584 LEDS at 120 frames per second. This is a super fast audio analyzer. Stream audio over a Bluetooth connection from your phone or other devices.

This is an open source project, all schematics, software and building instructions are available for you. Use it, change is, heck even sell it. It’s ok but if you do one or more of the above, please give me credit by linking back to my channel.…

Read more

boy boy boy boy boy

Twin Display Spectrum Analyzer with PixelMatrix

Posted on December 7, 2023October 31, 2024 by Mark Donners

This Spectrum Audio Analyzer project is nothing other than amazing. It includes a Teensy microcontroller board that drives 2 displays simultaneously at a very high speed. It is capable of doing a frequency analysis of the Audio in realtime to create a Stereo spectrum analyzer of 69 Channels and drive768 leds at the same time.

Yep you understood me correctly! 69 channels in stereo…so that’s actually 138 frequency bins. On top of that, we will be displaying a stereo VU meter on the second display.…

Read more

boy boy boy boy boy

Lego Brick Audio Analyzer

Posted on April 23, 2023 by Mark Donners

This Analyzer is based on my Analog analyzer but this time, I put it in a housing made of lego bricks.
The audio analysis is done with opamp band filters, the old fashion way….The front end is done by using a ESP32 to create patterns to be displayed with pixel leds.
This is a demo only. If you want to build your one, please visit the element 14 community for all details here:
https://community.element14.com/challenges-projects/element14-presents/project-videos/w/documents/28117/episode-599-how-to-build-a-spectrum-analyzer-with-lego-bricks-discrete-electronics
The video on how I build this for Element 14 is here:

💁‍♂️ Do you want to sponsor my channel?…

Read more

boy boy boy boy boy

Lego Spectrum Analyzer preview

Posted on February 24, 2023 by Mark Donners

…
Read more

boy boy boy boy boy

Nixie Spectrum Analyzer

Posted on August 19, 2022 by Mark Donners

This Nixie based looking clock is absolutely amazing. What you see are not real Nixie tubes but tubes of my own creation. It uses pixelleds that where fitted into a glass laboratory tube. The electronics is using a pure analog design to isolate all the different frequency bands. No need for hard to find IC’s and no FFT. The ESP32 is used to process the analog data into visible bars. ( Pixelleds)
This video is sponsored by @PCBWay They make great PCB board and offer good assembly service.…

Read more

boy boy boy boy boy

Sneak preview next project: nixie tube alike spectrum analyzer

Posted on July 31, 2022 by Mark Donners

Sponsored by @PCBWay
This is my upcoming project 10 channel analog analyzer with nixie Tubes ( Or honestly not nixie but DIY look a likes )

…
Read more

boy boy boy boy boy

Cathode ray tube first successful experiment diy

Posted on July 28, 2022 by Mark Donners

…
Read more

boy boy boy boy boy

Amazing Twin Audio Visualizer to the rescue

Posted on June 17, 2022 by Mark Donners

This Twin Audio Visualizer is nothing other than amazing. It includes a Teensy microcontroller board that drives 2 displays simultaneously at a very high speed. Combined with a Teensy Audio Board, it is capable of doing a frequency analysis of the Audio in realtime to create a Stereo spectrum analyzer of 69 Channels.

Yep you understood me correctly! 69 channels in stereo…so that’s actually 138 frequency bins. On top of that, we will be displaying a stereo VU meter on the second display.…

Read more

boy boy boy boy boy
  • 1
  • 2
  • 3
  • 4
  • Next
"I love open source projects. Learning and sharing knowledge without being commercially exploited."
I order my PCB's at PCBWay because they offer great quality and service.
Click on the logo for your special offer.

Recent Posts

  • Livestream The Electronic Engineer
  • Robot Voice Box Ends The World With One Command!
  • The fastest audio analyzer on a single ESP32
  • Twin Display Spectrum Analyzer with PixelMatrix
  • Lego Brick Audio Analyzer

Spectrum anayzer fft 64 Ch.

Made By Mark Donners. All rights reserved