Lab 1a - 2C 2007

Lab 1a - 2C 2007 - ECE 2C Laboratory Manual 1a Audio...

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1 © Bob York ECE 2C Laboratory Manual 1a Audio Amplifier Circuit Overview In the first part of lab#1 you will construct a low-power audio amplifier/speaker driver based on the LM386 IC from National Semiconductor. The audio amplifier will be a self- contained, battery-operated component. In the second part of the lab you will construct a microphone circuit using a compact electret condenser microphone cartridge. These circuit modules are important building blocks of many audio communications systems, and will be used in our ultrasonic transceiver system. By studying this document and experimenting with the components and circuits in the lab, pay attention to the following: Electrical characteristics of audio speakers Characteristics of condenser microphones Design of single-supply battery-operated op-amp circuits Use of diode limiters/clamps for input protection Use of active filters for tone control Choice of AC coupling capacitors We will discuss the analytical aspects of active filter design in lecture we will see them in action again in our IR receiver system. Remember, the objective here is not simply to create a working circuit, it is to learn about circuits! So, as you progress through the lab, try to understand the role of each component, and how the choice of component value may influence the operation of the circuit. Please tinker with component values, that is an especially valuable way to learn. Ask yourself questions such as: Why is this resistor here? Why does it have this resistance value? Why is this blocking capacitor 1 μ F instead of 0.1 μ F or 10 μ F or 100 μ F? Why was this particular op- amp chosen? It is only when you can answer such questions that you will truly understand the labs and progress towards designing your own circuits. In the process you may even find a better solution; in fact, many of the laboratory experiments in this course now include several slight modifications from the original that were inspired by student feedback.
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2 Audio Amplifier Circuit © Bob York 2 Table of Contents Pre-lab Preparation 2 Before Coming to the Lab 2 Schedule for Lab #1 2 Parts List 3 Full Schematics for Lab #1 4 Background information 6 Audio Speakers 6 In-Lab Procedure 8 1.1 Some comments on our choice of ICs 8 Why the LM386? 8 Why the LM358? 8 1.2 Speaker Equivalent Circuit 9 1.3 Assemble Amplifier on Breadboard 9 1.4 Summing network 11 1.5 Optional -- Tone-Control Circuit 12 1.6 Hardwire the Amplifier 13 1.7 Possible Improvements 14 Pre-lab Preparation Before Coming to the Lab Read through the lab experiment to familiarize yourself with the components and assembly sequence. Before coming to the lab, each group should obtain a parts kit from the ECE Shop. With reference to the full schematic in Figure 1-1 calculate the lower cutoff frequency imposed by capacitors C1-3 and R1-3 in the summing network: low f =______________Hz Schedule for Lab #1 To stay on schedule, you must do the following: Week #1: Audio amplifier Week #2: Microphone circuit
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This note was uploaded on 12/28/2011 for the course ECE 2C taught by Professor Yue during the Fall '08 term at UCSB.

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Lab 1a - 2C 2007 - ECE 2C Laboratory Manual 1a Audio...

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