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Digital Electronics

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

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  1. Digital Electronics Lab 2 Winter Quarter

  2. Analog Vs. Digital Winter Quarter

  3. 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

  4. The Transistor • Basic element of digital electronics • Typically built into integrated circuits • Can act like a “switch” Winter Quarter

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

  6. 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

  7. 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

  8. Symbol Truth Table A Y A Y 0 1 1 0 Boolean Equation _ Y = A Basic Logic Circuits: NOT Winter Quarter

  9. 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

  10. 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

  11. 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

  12. Prototype board for circuit layout Terminal posts for power (red) and ground (black) connections Winter Quarter

  13. Back side of Prototyping Board Metal strips create electrically-connected holes on the front Winter Quarter

  14. Note the gaps where there are no electrical connections Winter Quarter

  15. Examples of electrically-connected holes Winter Quarter

  16. And the corresponding gaps Winter Quarter

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

  18. 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

  19. 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

  20. 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

  21. 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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