There are LED lights that never quite turn off when switched off, this is their story… Learn Math and Science easily at 20% off at http://brilliant.org/ElectroBOOM Watch Steve Mould’s companion video: https://youtu.be/1uEmX5XClPY AND don’t forget to support ElectroBOOM, if you like that is: http://patreon.com/electroboom Checkout my merch: http://teespring.com/stores/electroboom Checkout my Amazon picks (my affiliate link): https://www.amazon.com/shop/Electroboom Follow me on Facebook: http://www.facebook.com/ElectroBOOM And Twitter: http://twitter.com/electroboomguy My other articles: https://www.electroboom.com/ Enter your school for tools: https://goo.gl/forms/VAgRre8rLVvA1cEi2 Thanks to http://CircuitSpecialists.com and http://keysight.com for proving my essential lab tools and giveaways. Below are my Super Patrons with support to the extreme! Nicholas Moller at https://www.usbmemorydirect.com The Guitar Rig Guru at https://www.altium.com/ Mark W. Bennett Andy Rod San My sponsors and top patrons: http://www.electroboom.com/?page_id=727 By: Mehdi Sadaghdar --------------------------------------------------------------------------