Electronics
http://www.allaboutcircuits.com/vol_3/index.html
http://www.dummies.com/how-to/content/electronics-components-amplify-with-a-transistor.html https://www.youtube.com/watch?v=q2OBYz3K6PM&index=2&list=PLnn6a3WqcakSCDMqYx0t1eyxzd3KMpBRr |