Lesson+4 - Why tlk whn u cn txt Engineers as a race are...

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Lesson 4 1 Why tlk whn u cn txt? “Engineers as a race are good at numbers, technology, problem solving, gadgets,” Steck said. “There’s a gravity that draws them to types of work like that. It’s not an accident – it’s what they’re good at. They’re not good at the talking, the social relationships.” Tech workers are the prototypical candidates for e- therapy, Zur said, because “they often prefer machines to people.” (Gainesville Sun)
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Lesson 4 2 Lesson 4 OpAmps, Capacitors, and Inductors (Oh My) Chapters 5 & 6 TA hours (Consulting): Tue 5th, Wed/Fri 7th period in NEB222
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Lesson 4 Challenge 3 The circuit shown includes both independent and dependent voltage sources along with the pre-assigned loop currents and node indices. Using mesh analysis, what is I 1 ? V1=42 V2=10 R=6 R=4 R2=3 I 1 I 2 2 1 2 1 2 2 1 2 1 1 7 3 4 3 10 2 3 9 3 6 42 1 I I I I I KVL I I I I I KVL ) ( : # ) ( : # R1 R3 3 Lesson 4
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Lesson 4 Challenge 3 V1=42 V2=10 R=6 R=4 R2=3 I 1 I 2 a=[9 -3; -3 7] a= | 9 -3 | |-3 7 | v=[42;10] inv(a)*v 6.0000 3.0000 I 1 = 6 I 2 = 3 4 Lesson 4
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Review of Op Amps. Lesson 4 5 Lesson 4
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OPERATIONAL AMPLIFIER (Op Amp) Lesson 4 Patent 2,102,671 (1932) H. Black 1932! Harold Black 6
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Lesson 4 Lesson 4 Philbrick Research - 1953 First all transistor OpAmp Fairchild Semiconductor 1960’s @ $300 per unit. Typical modern discrete OpAmp spec. <$0.50 7
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Lesson 4 Lesson 4 Simple AM radio receiver. Guitar “fuzzer” Op Amps Sample Applications 8
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Lesson 4 Lesson 4 Voltage divider Audio preamplifier OpAmps 9
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OpAmp Model Lesson 4 Review gain is a problem. Can be managed using feedback. 10
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Lesson 4 OpAmp V out = (-R 2 / R 1 ) V in ( (sign) inverted) G = -R 2 /R 1 V out - + + - V in R 1 R 2 V=0 Inverting Amplifier Example of the use of feedback 11 Lesson 4
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Lesson 4 Example If the input voltage is 2V, then V 0 = G V in = (-2)*(2) = -4. PSICE = -4.001V. Difference due to the LM324 being a non-ideal Op AMP. 12 Lesson 4 R 1 =10k , and R 2 =20k , Theoretical gain G = -R 2 /R 1 = -(20k/10k) = -2
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System Realization When did this feedback madness begin? Lesson 4 Edwin Howard Armstrong (December 18, 1890 – January 31, 1954) was an American electrical engineer and inventor .
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