Hi, I am pretty new to Arduino and I have that little speaker from Sparkfun (https://www.sparkfun.com/products/10722). It's pretty loud, but I want to make it sound louder. I've read of many "simple" circuits, made with various transistors+resistors combinations, but I don't have (right now) some of the required materials, so I was wondering : can I make a sound amplifier with a MOSFET transistor like that one : MosfetTransistor.pdf (included in the Arduino starter pack)? I just need to amplify the square wave produced by the Arduino's tone() function.
Thanks in advance