Operational amplifiers otherwise known as opamps are what amplifiers are made of. So I would say "Hey, make an amplifier." What are you going to make it with? You're going to make it with an opamp. The device. The opamp device. >> Let's just go over what an amplifier does and basically it just takes a voltage signal and increases it >> Say you have for example a 1.5 volt power source but you need say 3 volts to power an LED or something like that. You just use the amplifier to amplify that 1.5 volts to 3 volt signal. >> Yeah and we will be doing this in this course to amplify the signal of our GPIOs on the expansion header. So now when we reach that module, I believe it's module three, to build our amplifier, we are going to go a lot more in depth for now. You can kind of take a look here at some of the key characteristics of, you know, the operational amplifier. Maybe do a little research of your own, check it out. Check out the Wiki, look at our document. >> Yeah, it'll help you to familiarize yourself with this stuff right now so later on you might not be confused when we talk about it more in depth. >> Yeah, we're actually gonna solve the ideal amplifier equation for you later. But like Randy just said, we wanna kind of just give you a little insight. So, let's take a look at what we're actually gonna maybe do later. All right, there we go. The NTE987 is the op amp that we are going to be using for this course. It is special because if you look right there on the screen you have the chip that we're using. Took a picture of that. To the right of it is the diagram for an amplifier. Now That's non-ideal. And it takes two voltage inputs as your rail. So that's what you're stepping it up to. For instance, for us, we step ours up from 1.8 to, I think, somewhere around 3.3. Now, in order to do that, you would need a positive rail and a negative rail, that's the traditional operational amplifier. But for us we chose a special chip. This chip, the NTE, actually only requires a positive rail which means you can create an amplifier Just by using the pins on your board. And you can step it up to the five volt, you can step it up to the 12 volt, which is your system DCN pin on there, which we're going to go over later and everything. But that's the great part about this. You don't need to go buy some expensive power supply to get yourself a positive and a negative voltage. You don't need to build yourself a virtual ground, even though I would recommend checking that out online. It's a very cool concept [LAUGH] on turning a positive voltage into a virtual negative voltage kind of deal. But yeah, so you see up there you have the NTE 987 operational amplifier chip. It has four amps in it, we're gonna go over all this again, but just thought kind of show you some cool little pictures of the amplifiers we built along with the diagram for the NTE, get you familiar, get your feet wet, look up a little more. >> Right. >> Take the keywords that we've kind of talked about check out the documentation and we will see you later. Alright.