BE Lesson 9 Make an audio amplifier Use an operational amplifier (opamp) to build an audio amplifier © 2012 C. Rightmyer, Licensed under The MIT OSI License,

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Presentation transcript:

BE Lesson 9 Make an audio amplifier Use an operational amplifier (opamp) to build an audio amplifier © 2012 C. Rightmyer, Licensed under The MIT OSI License, 20 July 2012

BE project 9-1. An audio amplifier using the LM-386 opamp

Schematic for the completed audio amplifier Adapted from:

Pinout for LM386N-3 (U2) GAIN - INPUT + INPUT GND BYPASS Vs Vout

Hookup diagram for BE ckt  F 10  F  F  F  F place speaker face up 10K 10   F 9v Stereo input D1 and D2 = 1N4148 D1 D2

BE project 9-2. Bonus Velleman audio amplifier kit K4001

Background slides for L9

Frequency response of an ideal audio amplifier

A typical high-quality amplifier’s frequency response curve

Frequency response with a lower quality amp

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