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Digital Electronics. Lab 2. Analog Vs. Digital. 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. The Transistor.

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digital electronics

Digital Electronics

Lab 2

Winter Quarter

analog vs digital
Analog Vs. Digital

Winter Quarter

analog vs digital1
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
The Transistor
  • Basic element of digital electronics
  • Typically built into integrated circuits
  • Can act like a “switch”

Winter Quarter

boolean algebra
Boolean Algebra
  • Symbolic representation of logic statements
  • Uses many basic arithmetic symbols: +, -, (), etc.

Winter Quarter

basic logic circuits and
Symbol

Truth Table

A

Y

B

A

B

Y

0

0

0

0

1

0

1

0

0

Boolean Equation

1

1

1

Y = A•B

Basic Logic Circuits: AND

Winter Quarter

basic logic circuits or
Symbol

Truth Table

A

Y

B

A

B

Y

0

0

0

0

1

1

1

0

1

Boolean Equation

1

1

1

Y = A+B

Basic Logic Circuits: OR

Winter Quarter

basic logic circuits not
Symbol

Truth Table

A

Y

A Y

0

1

1

0

Boolean Equation

_

Y = A

Basic Logic Circuits: NOT

Winter Quarter

basic logic circuits nand
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

basic logic circuits nor
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”

Winter Quarter

integrated circuits chips
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

slide12
Prototype board for circuit layout

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

Winter Quarter

slide13
Back side of Prototyping Board

Metal strips create electrically-connected holes on the front

Winter Quarter

slide17
The channel is for ICs so that each pin will have its own independent row of connected holes

Winter Quarter

light emitting diodes led
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

Winter Quarter

power mosfets
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

Winter Quarter

laying out the circuit
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!

Winter Quarter

today s goals
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

Winter Quarter

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