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)
Why do you think that https://github.com/TheAmadeus25/LaColorduino is a good alternative to antispy-jammer