How to Make a Spy Microphone: The Acoustic Telescope
https://maker.pro/pcb/projects/build-diy-spy-microphone-acoustic-telescope
This acoustic telescope will allow you to hear noises and voices from far away.
How to Control an FM Synthesizer With a Webcam
https://maker.pro/wekinator/projects/how-to-control-an-fm-synthesizer-with-a-webcam
Learn how to make an FM synthesizer that creates noise based on your face using Wekinator, openFrameworks, and ChucK.
Machine Learning for Makers: How to Modulate an Arduino’s Sound
https://maker.pro/custom/projects/machine-learning-for-makers-how-to-modulate-an-arduinos-sound
Use the machine learning program Wekinator to play different noises through buzzers connected to an Arduino UNO.
Brushed DC Motor Programmable Speed Regulator
https://maker.pro/custom/projects/brushed-dc-motor-programmable-speed-regulator
This article explains how to design, build a low noise high performance low cost brushed DC motor programable speed regulator. The regulator is immune to the temperature, voltage, and motor load variation. Also, this circuit does not care about the motor coil resistance which allows using different motors in one application without any adjustments.
Guide On Implementing Audio Signal Detector
https://maker.pro/custom/projects/guide-on-implementing-audio-signal-detector
The guide describes the implementation of an audio signal detector with the GreenPAK SLG47512. This design can detect human speech or music and can ignore single tone noise or flat random noise. The audio signal detector can be used in safety services or to save energy in audio decks.