Direct Digital Synthesis - How DDS Works and an Arduino ExampleWhat do
Electronic Waveforms Sound Like? Three Ways to Create Bode Plots Direct Digital Synthesis - How it Works and a Demo on Arduino Due| RSGC ACES: Investigations into Audio Amplification, Filters and Analysis (November 2025) |
Wave Form Generation and Plotting
Direct Digital Synthesis - How DDS Works and an Arduino ExampleWhat do
Electronic Waveforms Sound Like? Three Ways to Create Bode Plots Direct Digital Synthesis - How it Works and a Demo on Arduino DueAudio Amplification
Technoblogy: ATtiny85 Function Generator
Investigations
Sending various frequencies of the Tiny Function Generator (TFG)'s square wave output into the 3-pole low pass RC filter described above (fc = 7.1642 Hz) resulted in three Arduino Nano plots below. Attentuation is evident confirming the Youtube presentation from Matthew Johnson (How Low Pass Filters work)
Passive Filters
References
Digikey: Filter Calculator
Okawa Electric Design: Filter Design Tools
Youtube: How Low Pass Filters Work
Electronics Tutorials: Sallen and Key Filter
My Falstad Simulations