Electronic Circuitry

1. Electronic Circuitry Resistors Capacitors Transistors Light Emitting Diodes (LED) Potentiometers Silicon Controlled Rectifiers (SCR)

2. Resistors • passivetwo-terminalelectrical component that implements electrical resistance as a circuit element • help control current flow in a circuit. • protect electronics from circuit overload or destruction • perform as filters or voltage dividers • Color bands indicate strength of resistance (ohms)

3. Capacitors • A capacitor (originally known as condenser) is a passivetwo-terminalelectrical component used to store energy in an electric field • characterized by a single constant value, capacitance, measured in farads

4. Capacitors uses • widely used in electronic circuits for blocking direct current while allowing alternating current to pass

5. Capacitors uses • widely used in electronic circuits for blocking direct current while allowing alternating current to pass • in filter networks, for smoothing the output of power supplies

6. Capacitors uses • widely used in electronic circuits for blocking direct current while allowing alternating current to pass • in filter networks, for smoothing the output of power supplies • in the resonant circuits that tune radios to particular frequencies

7. Capacitors uses • widely used in electronic circuits for blocking direct current while allowing alternating current to pass • in filter networks, for smoothing the output of power supplies • in the resonant circuits that tune radios to particular frequencies • in electric power • transmission systems for • stabilizing voltage and • power flow

8. Transistors • a semiconductor device used to amplify and switchelectronic signals and electrical power

9. Transistors • a semiconductor device used to amplify and switchelectronic signals and electrical power • composed of semiconductor material with at least three terminals for connection to an external circuit

10. Transistors • a semiconductor device used to amplify and switchelectronic signals and electrical power • composed of semiconductor material with at least three terminals for connection to an external circuit • voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals

11. Transistors • a semiconductor device used to amplify and switchelectronic signals and electrical power • composed of semiconductor material with at least three terminals for connection to an external circuit • voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals • is the fundamental building block of modern electronic devices

12. Transistor uses • can amplify a signal

13. Transistor uses • can amplify a signal • the vast majority of transistors now are produced in integrated circuits (often shortened to IC, microchips or simply chips)

14. Transistor uses • can amplify a signal • the vast majority of transistors now are produced in integrated circuits (often shortened to IC, microchips or simply chips) • essential usefulness of a transistor comes from its ability to use a small signal applied between one pair of its terminals to control a much larger signal at another pair of terminals. This property is called gain

15. Transistor uses • can amplify a signal • the vast majority of transistors now are produced in integrated circuits (often shortened to IC, microchips or simply chips) • essential usefulness of a transistor comes from its ability to use a small signal applied between one pair of its terminals to control a much larger signal at another pair of terminals. This property is called gain • can be used to turn current on or off in a circuit as an electrically controlled switch

16. LEDs - Light Emitting Diodes • is a semiconductor light source

17. LEDs - Light Emitting Diodes • is a semiconductor light source • When switched on, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence

18. LEDs - Light Emitting Diodes • is a semiconductor light source • When switched on, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence • advantages over incandescent light sources including lower energy consumption, longer lifetime, improved physical robustness, smaller size, and faster switching

19. Potentiometers • A potentiometer, informally, a pot, in electronics technology, is a three-terminalresistor with a sliding contact that forms an adjustable voltage divider

20. Potentiometers • A potentiometer, informally, a pot, in electronics technology, is a three-terminalresistor with a sliding contact that forms an adjustable voltage divider • or it can act as a variable resistor or rheostat.

21. Potentiometers • commonly used to control electrical devices such as volume controls on audio equipment.

22. Potentiometers • commonly used to control electrical devices such as volume controls on audio equipment. • Potentiometers operated by a mechanism can be used as position transducers, for example, in a joystick

23. Silicon Controlled Rectifiers (SCR) • is a four-layer solid statecurrent controlling device

24. Silicon Controlled Rectifiers (SCR) • is a four-layer solid statecurrent controlling device • "silicon controlled rectifier" or SCR is General Electric's trade name for a type of thyristor, which act as bistable switches, conducting when their gate receives a current trigger

25. Silicon Controlled Rectifiers (SCR) • is a four-layer solid statecurrent controlling device • "silicon controlled rectifier" or SCR is General Electric's trade name for a type of thyristor, which act as bistable switches, conducting when their gate receives a current trigger • used in switching applications - In the normal "off" state, the device restricts current to the leakage current. When the gate-to-cathode voltage exceeds a certain threshold, the device turns "on" and conducts current

26. Now sort your components in your bag into catagories and compare with the parts list in the yellow book to see how you did • List the symbols for them in a circuit diagram in your notebooks