So I've been making a DIY gift for my girlfriend and I used an 8 ohm speaker with an Arduino Uno to play a sound effect on it. After I finished it, I showed it to my friends and whenever the sound starts it apparently emits a high frequency sound that I can't hear but is awful for everyone who can.This is the info I followed to play the effect: http://ift.tt/2eN2Z0g'm not super familiar with this stuff and I'm honestly lost for what to do via /r/DIY http://ift.tt/2xcqwiM
