Here's the link to the introductory article to Op-Amps we looked at earlier this week: https://www.electronics-tutorials.ws/opamp/opamp_1.html
Additionally, here are a couple links to some specific Op-Amp schematics:
The next circuits we'll look at are low pass, high pass and band pass filters. These Op-Amp circuits are great for only allowing certain frequencies of an input signal to "pass" through the circuit and to eliminate unwanted frequencies (such as noise). Once we have a comfortability with building them, we will have the basic building blocks for many complex and unique circuits and well on our way into the world of analogue electronics.
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