BEndicott_Week_4_iLab.docx - Lab Four \u2013Audio Amplifiers By Benjamin Endicott ECT246 Electronic Systems III with Lab Gary House DeVry University Online

BEndicott_Week_4_iLab.docx - Lab Four –Audio Amplifiers...

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Lab Four –Audio Amplifiers By Benjamin Endicott ECT246 Electronic Systems III with Lab Gary House DeVry University Online June 1, 2014
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Part A: Audio Amps TCO #4: Given an audio amplifier application that uses an integrated amplifier, examine the overall amplifier’s performance and verify the operation by using suitable input and output circuits. Investigation of the LM386 Audio Amplifier takes place during week 4. The LM386 is a versatile special purpose op-amp used to amplifier audio frequencies. The device is contained in a single 8-pin dip package and has a gain of up to 200 and a power output of 1-watt. A. Use an Internet search utility, such as Google, find an audio amplifier such as a LM386 download the specification sheet and determine its general characteristics such as its general description, the package type and pin configuration. a. Usethe Internet to search for a LM386 data sheet. Try or . Print the datasheet. b. From the data sheet find the following information and record. What are its general characteristics? The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200. The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the LM386 ideal for battery operation. Features Battery operated Minimum external parts Wide supply voltage range: 4V–12V or 5V–18V Low quiescent current drain: 4mA Voltage gains from 20 to 200 Ground referenced input Self-centering output quiescent voltage Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8W, PO = 125mW, f = 1kHz) Available in 8 pin MSOP package Applications AM-FM radio amplifiers Portable tape player amplifiers Intercoms TV sound systems Line drivers
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Ultrasonic drivers Small servo drivers Power converters Package type 8 Pin MSOP Package type Pin Configuration B. Use the specification sheet to determine its electrical characteristics and operating values.
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