Replace buzzer in microwave oven with Windows XP startup sound http://tim.gremalm.se/%C2%B5mute-a-microwave-oven-silencer/
C Arduino Makefile
Latest commit 729c422 Feb 10, 2017 @TimGremalm committed on GitHub Merge pull request #1 from CRImier/master
Some changes

README.md

MicroMute

Replace buzzer in microwave oven with Windows XP startup sound http://tim.gremalm.se/%C2%B5mute-a-microwave-oven-silencer/

You need this repository cloned to your PC: https://github.com/sudar/Arduino-Makefile

Follow its installation instructions and then edit this project's Makefile so that path to Arduino.mk is correct.

Then clone this: https://github.com/PaulStoffregen/FreqCount and move it to your Arduino IDE /libraries folder.

Connect the buzzer output to pin 5, speaker amplifier input to pin 11 and enjoy your sound, whichever one you upload!