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## PowerPoint Slideshow about 'Digital Electronics' - Albert_Lan

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Analog Vs. Digital

Winter Quarter

Analog Vs. Digital

- Analog
- Continuous
- Can take on any values in a given range
- Very susceptible to noise
- Digital
- Discrete
- Can only take on certain values in a given range
- Can be less susceptible to noise

Winter Quarter

The Transistor

- Basic element of digital electronics
- Typically built into integrated circuits
- Can act like a “switch”

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Boolean Algebra

- Symbolic representation of logic statements
- Uses many basic arithmetic symbols: +, -, (), etc.

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Symbol

Truth Table

A

B

Y

A

Y

B

0

0

1

0

1

1

1

0

1

1

1

0

Boolean Equation

_____

Y = (A•B)

Basic Logic Circuits: NAND- NAND = “not AND”
- Commonly used to implement other logic circuits

Winter Quarter

Symbol

Truth Table

A

B

Y

A

Y

B

0

0

1

0

1

0

1

0

0

Boolean Equation

1

1

0

_____

Y = (A+B)

Basic Logic Circuits: NOR- NOR = “not OR”

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A collection of many transistors, resistors, and capacitors on a single silicon wafer

The wafer is mounted to a carrier for ease of use and dissipation of heat

8

7

1

5

Notches mark pin 1 end or pin 1 of IC

(highlighted for clarity)

4

1

Integrated Circuits (Chips)Winter Quarter

Prototype board for circuit layout

Terminal posts for power (red) and ground (black) connections

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Back side of Prototyping Board

Metal strips create electrically-connected holes on the front

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Note the gaps where there are no electrical connections

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Examples of electrically-connected holes

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And the corresponding gaps

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The channel is for ICs so that each pin will have its own independent row of connected holes

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Light Emitting Diodes (LED)

- Function depends on orientation
- Pass electrical current in one direction only
- Illuminates when current is flowing through it
- Emits light proportional to current through diode
- Must have current limited by a resistor in series

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Power MOSFETs

- Allows control of high current DC loads by low-voltage digital signals
- With a ‘1’ signal at the gate, current may flow from drain to source. Otherwise, the path is closed

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Laying Out the Circuit

- Chips “bridge” the gaps
- Devices in adjacent horizontal rows are connected
- Make sure power is turned off until circuit is finished!

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Today’s Goals

- Build digital circuits on your breadboards and determine their function
- Test the Mystery Circuit
- Build a circuit to operate a motor with a power MOSFET

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