Lesson Notes By Weeks and Term v4 - SHS 3
ELECTRONIC COMPONENTS AND CIRCUITS
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ELECTRONIC COMPONENTS AND CIRCUITS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Applied Technology
Class: SHS 3
Term: 2nd Term
Week: 16
Grade code: 2.5.2.LI.4
Strand code: 4
Sub-strand code: 2
Content standard code: 2.5.2.CS.1
Indicator code: 2.5.2.LI.4
Theme: ELECTRICAL AND ELECTRONIC TECHNOLOGY
Subtheme: ELECTRONIC COMPONENTS AND CIRCUITS
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This lesson introduces one of the most versatile and important building blocks in modern electronics: the Operational Amplifier, or "Op-Amp". Think of Op-Amps as the "brains" or the "muscle" in many electronic circuits. They are tiny integrated circuits (ICs) that can amplify very small signals, compare voltages, and even perform mathematical operations like adding or subtracting. In Ghana, from the powerful sound systems used at community events and churches, to the sensor circuits in automated streetlights or agricultural equipment, Op-Amps are working silently behind the scenes.
A. What is an Operational Amplifier (Op-Amp)?
An Op-Amp is a high-gain DC-coupled differential voltage amplifier. Let's break that down: High-gain: It can take a tiny input voltage and make it very, very large. The gain can be in the hundreds of thousands. DC-coupled: It can amplify both AC and DC signals. Differential: It amplifies the *difference* between two input voltages.
We often start by studying the Ideal Op-Amp, which has perfect characteristics that make calculations simpler.
Properties of an Ideal Op-Amp: Infinite Open-Loop Gain (A_OL = ∞): The gain without any feedback components is infinitely large. Infinite Input Impedance (Z_in = ∞): It draws no current from the input source. This means we can assume no current flows into the input terminals. Zero Output Impedance (Z_out = 0): It can deliver any amount of current to the load without its output voltage dropping. Infinite Bandwidth: It can amplify any frequency, from DC to infinitely high frequencies.