Lesson 55 Setting Up the Operational Amplifier

Chapter Lesson 55 Setting Up the Operational Amplifier

Electronic Circuits for the Evil Genius Second Edition 64 Lessons with Projects
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Electronic Circuits for the Evil Genius Second Edition 64 Lessons with Projects

  • 222Section 16 ■Exploring the Op AmpHow does an AC signal move in a DCenvironment?Look closely at the two drawings in Figure L54-6. The image on top shows the AC signal withground as its natural reference.The image on the bottom shows the AC signalwith an adjusted reference in a DC environment.The current does not affect the signal.Lesson 55Setting Up the Operational AmplifierThe Op Amps are, by far, the most versatile andvaluable components in all of electronics. They areactually the heart of many digital systems. I can’tpass up this opportunity to explore how they areapplied and used in digital electronics.Start Building the CircuitAs we just learned in Lesson 54, there needs to bea reference point for carrying the AC signal. Set upthe two resistors as shown in Figure 55-1. Thesewill be the voltage dividers used to set yourreference point. It’s best to use 5 band 1% resistors.Take the following measurements:■Total voltage ______■The reference point voltage ______This allows ______volts above the reference toact as the positive portion of the AC signal and_______volts below the reference to act as the_______ for the AC signal.Now Add the Op AmpFigure 55-2 moves us to the next step.Figure L54-6Figure L55-1Figure L55-2