Building a high side switch with 2 components: A P-Channel MOSFET and a resistor.
Read the article:
http://hackaday.com/2015/09/16/learn-and-build-a-high-side-switch
Music:
Latin Industries Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/