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Simplest ultrasonic ANTISPY voice recording jammer based on ATTINY13 / ATTINY85/45/25 / ARDUINO with PAM8403 / TPA3116D2 module driving piezo ultrasonic transducers (and optionally AD8933 signal generator)
Patches to enable 15KHz video output
Arduino project controlling a PWM PC fan with a rotary encoder, monitored on a small graphics LCD.