1. 1 KMUTT: S. Srakaew CPE 221 Introduction What is “Electronics”? Electric circuit Connections of conductive wires and passive devices Electronics circuit Electric circuit that contains both passive and active devices

2. 2 KMUTT: S. Srakaew CPE 221 Introduction Passive devices Resistor Voltage-current relation: V = R I, v(t) = R i(t) Inductor Capacitor Voltage-current relation: v(t) = L di(t)/dt Voltage-current relation: i(t) = C dv(t)/dt

3. 3 KMUTT: S. Srakaew CPE 221 Introduction Active devices Diodes Bipolar junction transistors (BJT) Field-effect transistors (FET)

4. 4 KMUTT: S. Srakaew CPE 221 Introduction Active devices (Cont’d) Linear integrated circuits Operational amplifiers Other solid-state devices

5. 5 KMUTT: S. Srakaew CPE 221 Introduction Basic circuit analysis KCL Summation of currents flow in to (or out from) a node is zero KVL Summation of voltages across all elements in a mesh is zero Norton and Thevenin equivalent circuits A two-terminal network can be represented as a current source connected in parallel with Norton’s equivalent resistance (or a voltage source connected in series with Thevenin’s equivalent resistance)

6. 6 KMUTT: S. Srakaew CPE 221 Introduction Example: Use KCL to find all node voltages V1V1 V2V2 V3V3 SN 1,2&3:5 - V 1 /25 - V 2 /20 - V 3 /40 = 0 Voltage source 60V:V 1 - V 2 = -60 Voltage source 100V:V 1 - V 3 = 100 V 2 = V 1 + 60 V 3 = V 1 - 100 8V 1 + 10V 2 + 5V 3 = 1000 Therefore, 8V 1 + 10(V 1 + 60) + 5(V 1 - 100) = 1000V 1 = ?, V 2 =?, V 3 = ?

7. 7 KMUTT: S. Srakaew CPE 221 Introduction Example: Use KVL to find all mesh currents i1i1 i2i2 i3i3 i4i4

8. 8 KMUTT: S. Srakaew CPE 221 Introduction Example: Find Thevenin’s and Norton’s equivalence of the circuit below:

9. 9 KMUTT: S. Srakaew CPE 221 Introduction Homework, Lab and Project policy Homework assignments due every week( about 10) Lab assignments due every other week (about 6) Project assignments due every four week (about 4)

10. 10 KMUTT: S. Srakaew CPE 221 Introduction Homework Assignment 1 Circuit analysis (KCL, KVL) Connections of conductive wires and passive devices Thevenin and Norton Equivalent circuits Electric circuit that contains both passive and active devices

11. 11 KMUTT: S. Srakaew CPE 221 Introduction Lab Assignment 1 Simulation of simple circuits Select a circuit containing passive devices and use a simulation program(i.e., EWB, Protheus, etc) to simulate its behavior

12. 12 KMUTT: S. Srakaew CPE 221 Introduction Project topics Class A amplifier Class B amplifier Class C amplifier Class D amplifier Dimmer Switching power supply Voltage regulator Motion detection DC Motor control Projects are not limited to the following topics. Students are free to propose others.