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Audio Spot Frequency Oscillator firmware This ZIP file contains the Arduino sketch for the Audio Spot Frequency Oscillator. Cat No SC3651. Price: Free Files: Audio Spot Frequency Oscillator sketch.zip (ZIP contains .ino file; 3.5KB) Related to: Project: Audio Spot Frequency Oscillator (October 2026 [print issue]) Other items relevant to this project: Audio Spot Frequency Test Generator PCB [04111261] ($5.00) PCM5102 DAC module ($10.00) NJM5532DD ultra-low-noise, low-distortion dual op amp ($5.00) NJM5532D low-noise, low-distortion dual op amp ($3.50) 0.96in white OLED with SSD1306 controller ($10.00) 0.96in cyan OLED with SSD1306 controller ($10.00) Audio Spot Frequency Test Generator PCB pattern (PDF download) [04111261] (Free)