Transistor pinout3/20/2023 ![]() Using a transistor as a switch, similar to a light switch, allows us to use voltage or current to turn it on or off, which then allows current to flow through another part of the circuit. When you turn on the light switch in your home, you do a little mechanical work with your hands that allows electricity to flow through your light bulbs. One of the best features of transistors that enables modern digital electronics is that a transistor can act like a switch. We will look at this in more detail when we review the different types of transistors later. Transistor Switch The net effect is that we can use a little voltage or current to control a much larger voltage or current. The physics of transistors allows us to use either voltage or current to manipulate leverage of electrical energy in the transistor. When you need to do mechanical work on something, if you add leverage, you can amplify your work. We will walk through each of these in more detail next. Transistor AmplifierĪny time you want to use a little of something to get even more of something, its called amplification.Īs an analogy, consider mechanical leverage. Joining several transistors with other electrical components like resistors and diodes can even create logic gates. ![]() The two main transistor functions are as an amplifier and a switch. These functions work for individual transistors as well as combinations of them. You might be asking: so when was the transistor invented? There are three important dates in regards to the invention of the transistor:ġ927 - Julius Lilienfeld patents the field-effect transistor, but couldn't produce it at that time due to limits of technology.ġ947 - William Shockley, John Bardeen, and Walter Brattain invent the point-contact transistor at the company Bell Telephone Laboratories, Inc.ġ956 - Nobel Prize in Physics awarded to Shockley, Bardeen, and Brattain for the transistor. Without the transistor, modern electronics would not exist. The size of a radio dramatically dropped by not needing to use vacuum tubes anymore. The transistor radio was one of the first things to be revolutionized from this technology. When it was invented, it led to an electronic revolution that ushered in a new era of technology. The transistor is a fundamental building block of modern day electronics. #1 Lessons: Transistors make great switches and amplifiers, and the two main types of are:īipolar Junction Transistors (BJT) - you use current to manipulateįield Effect Transistors (FET) - you use voltage to manipulate
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