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EFM8 Sound Synthesizer From Square Wave to Sine Wave

3,913 views · Published 5 October 2015 · 0:25 · Indexed 2 October 2026

Channel: All About Circuits · 2015 · Science & Technology

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View full article: http://www.allaboutcircuits.com/projects/efm8-sound-synthesizer-from-square-wave-to-sine-wave/

The goal of this project is to design a sound synthesizer that can play standard musical notes. We will accomplish this using a low-cost, small-form-factor EFM8 microcontroller in conjunction with a few external components and a speaker. In this first article we will focus on converting a square wave generated by the EFM8 into a sine wave suitable for driving a speaker. The essential component in this process is a clock-tunable monolithic lowpass filter. In this project we will use the LTC1063 fifth-order Butterworth filter IC from Linear Technology, though parts with higher-order frequency response and different filter types are available (such as the MAX7401, an eighth-order Bessel lowpass filter from Maxim Integrated). ICs such as these are based on switched-capacitor filter designs, so we will start with a brief overview of this technology. For more information, as well as all the latest All About Circuits projects and articles, visit the official website at http://www.allaboutcircuits.com/

Check out author's profile on All About Circuits and see more articles and technical https://www.allaboutcircuits.com/author/robert-keim

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