mith College Computer Science CSC270 Spring 16 Circuits and Systems Lecture Notes Week 3 Dominique Thiébaut
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1 mith College Computer Science CSC270 Spring 16 Circuits and Systems Lecture Notes Week 3 Dominique Thiébaut dthiebaut@smith.edu
2 Crash Course in Electricity and Electronics
3 Zero Physics background expected!
4 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits
5 Main Concepts: Difference in Potentials vs. Intensity
6 An Analogy Hoover Dam
7 An Analogy Hoover Dam Difference in Potentials Intensity
8 An Analogy Hoover Dam Difference in Potentials Resistance Intensity
9 An Analogy Hoover Dam Difference Resistance in Potentials Intensity =0
10 An Analogy Hoover Dam Difference in Potentials Intensity
11 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits
12 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity
13 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity
14 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity
15 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity
16 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity
17 Another Analogy
18 Another Analogy Difference in Pressure
19 Another Analogy Difference in Pressure No resistance in the pipe no difference in pressure
20 Another Analogy Resistance Difference in Pressure
21 Another Analogy Resistance Difference in Pressure
22 Observations Keeping Intensity constant, Resistance Difference in Potentials
23 + - R
24 + - R
25 I current Power Supply + - V voltage R Resistance Ground
26 Assumptions An electrical wire has no resistance A closed switch has no resistance An open switch has infinite resistance The current flowing in a closed-loop circuit is the same everywhere.
27 I current Power Supply + - V voltage R Resistance Ground
28 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits
29 Ohm s Law Voltage = Resistance * Intensity V = R. I
30 Ohm s Law Voltage = Resistance * Intensity V = R. I Volt Ohm Amp V Ω A
31 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits
32 What is I? I 5V + - V voltage R 1 KΩ Ground
33 What are I, I1, I2? I 5V + - I2 R2 1 KΩ I1 R1 1 KΩ Ground
34 What is I? 5V + - I R1 1 KΩ R2 4 KΩ Ground
35 What are V1, V2? 5V + I V1 R1 1 KΩ - V2 R2 4 KΩ Ground
36 What are V1, V2? 5V + I V1 R1 1 KΩ - V2 R2 4 KΩ Ground
37 What is I? 5V + - R1 3 KΩ R2 7 KΩ I Ground
38 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits
39 What does R look like?
40
41 What values?
42 Simplification I 5V + - V voltage R 1 KΩ Ground
43 Simplification +5V R 1 KΩ
44 How Does that Apply to Us? 1 x
45 How Does that Apply to Us? +5V 1 x x
46 We stopped here last time
47 How Does that Apply to Us? x 0
48 How Does that Apply to Us? x 0 x 0
49 Exercise +5V 2-to-4 A1 Y0' Y What is Y(a)? a A0 Y1' NC Y2' NC E' Y3' NC
50 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits
51 Meet The Diode
52 Diode = semiconductor
53 R1 1 KΩ + - P N
54 R1 1 KΩ + - P N
55 R1 1 KΩ + - N P
56 R1 1 KΩ + - N P
57 Symbol R1 1 KΩ + - P N
58 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits
59 Meet the Transistor
60 R1 1 KΩ C + - N P N B R2 10 KΩ + - E Collector Base Emitter
61 R1 1 KΩ C + - N P N B R2 10 KΩ V E Collector Base Emitter
62 R1 1 KΩ C + - N P N B R2 10 KΩ + - E Collector Base Emitter
63 R1 1 KΩ C + - N P N B R2 10 KΩ V E Collector Base Emitter
64 Symbol R1 1 KΩ + C B R2 - E 10 KΩ + - Collector Base Emitter
65 Symbol R1 1 KΩ + C B R2 - E 10 KΩ + - Collector Base Emitter
66 What is f(a)? Quiz 1 KΩ a KΩ f 2N2222
67 A Real TTL Circuit
68 A Real TTL Circuit
69 A Real TTL Circuit
70 A Real TTL Circuit
71 What is h(a,b)? Quiz 1 KΩ 1 KΩ a b 10 KΩ 10 KΩ h
72 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits
73 Practical Design Rules for Discrete Parts
74 Input Switch 1 KΩ
75 Logic Indicator R 04
76 Logic Indicator What s a good value? R 04
77 Logic Indicator What s a good value? R 04
mith College Computer Science CSC270 Spring 16 Circuits and Systems Lecture Notes Week 2 Dominique Thiébaut
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