Introduction to Digital Circuit Introduction to Digital Circuit Design
1 Introduction to Engineering Lab 3 -1 Basic Electronics with Circuit Prototyping Agenda...
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Transcript of 1 Introduction to Engineering Lab 3 -1 Basic Electronics with Circuit Prototyping Agenda...
1
Introduction to EngineeringLab 3 -1Basic Electronics with Circuit Prototyping
Agenda Introduction to circuits Building a simple circuit
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OVERVIEW
MAJOR TYPES of ELECTRONIC CIRCUITS COMPONENTS and SYMBOLS PROTOTYPING BOARDS POWER SUPPLIES DIGITAL MULTIMETER DIGITAL COUNTER SCHEMATIC CIRCUIT DRAWINGS SIMPLE CIRCUIT, BUILD AND USE
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ELECTRONIC CIRCUITS
DIGITALOPERATION EXHIBITS A FINITE NUMBER OF DISCRETE CONDITIONS (e.g., ON/OFF) AND IS RELATIVELY INSENSITIVE TO NOISE
ANALOGOPERATION EXHIBITS AN INFINITE NUMBER OF DIFFERENT CONDITIONS AND IS RELATIVELY SENSITIVE TO NOISE
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ELECTRONIC COMPONENTS
SWITCHES RESISTORS CAPACITORS LIGHT EMITTING DIODES CADMIUM SULFIDE PHOTOCELLS TRIM POTENTIOMETERS TRANSISTORS INTEGRATED CIRCUITS (ICs)
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SWITCHES NUMBER OF POLES (contact pairs) TYPE OF ACTION (bi-stable, momentary, etc.) BODY/ACTUATOR STYLE (micro, toggle, button, chassis mount, etc.)
MICROSWITCH, LEVER ACTUATED, SPDT
C
NO
NC
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RESISTORS
RESIST THE FLOW OF ELECTRICAL CURRENT NO POLARITY POWER LIMITED UNIT OF MEASURE IS OHMS COLOR BANDS INDICATE VALUE, TOLERANCE
A 100 Kohm Resistor
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CAPACITORS
HOLD AN ELECTRICAL CHARGE THAT VARIES WITH CURRENT (VOLTAGE)
VOLTAGE LIMITED UNIT OF MEASURE IS FARADS (but
generally expressed in micro, nano, or pico farads)
Polarized and Non-polarized Capacitors
+
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LIGHT EMITTING DIODES
PASS ELECTRICAL CURRENT IN ONE DIRECTION ONLY
EMIT LIGHT PROPORTIONAL TO CURRENT THROUGH DIODE (over limited range)
MUST HAVE CURRENT LIMITED BY A RESISTOR IN SERIES
+
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CdS PHOTOCELLS
RESISTANCE THAT VARIES WITH INCIDENT LIGHT
SENSITIVE TO ALL LIGHT (whether from LED or room lighting)
POWER LIMITED
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TRIM POTENTIOMETERS
RESISTANCE THAT VARIES BY MANUAL ADJUSTMENTSLOTTED KNOB USED TO MOVE INTERNAL ‘WIPER’ ACROSS RESISTANCEPOWER LIMITED
1 2 3
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TRANSISTORS
CONTROL THE FLOW OF CURRENT IN ONE DIRECTION
MUST HAVE CURRENT LIMITED BY LOAD AND/OR ADDITIONAL RESISTANCE
E
B
C
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INTEGRATED CIRCUITS MANY TRANSISTORS,
RESISTORS, AND CAPACITORS ON A SINGLE SILICON WAFER TO PERFORM SPECIFIC FUNCTIONS
THE WAFER IS MOUNTED TO A CARRIER FOR EASE OF USE AND HEAT DISSIPATION
1
15
8
4
7
Notches mark pin 1 end or pin 1 of IC
(highlighted for clarity)
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PROTOTYPING BOARDS
Bare Board Power and
ground terminal posts
5-hole sets, electrically common (connected) internally
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PROTOTYPING BOARDS
Bare Board Power and
ground terminal posts
Power bus (red/solid)
Ground bus (blue/dashed)
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PROTOTYPING BOARDS
Bare Board Power and
ground terminal posts
Jumpers for complete distribution of power
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DIGITAL MULTIMETER
MEASURE RESISTANCE, CURRENT, or VOLTAGE
WE WILL USE IT FOR VOLTAGE MEASUREMENTS
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DIGITAL COUNTER
ACCUMULATES AND DISPLAYS ‘COUNTS’
EACH ‘CLEAN’ SWITCH CLOSURE (OR EQUIVALENT) ON THE INPUT CAUSES THE DISPLAY TO INCREMENT BY ONE
RESET DISPLAY TO ZERO WITH FRONT PUSHBUTTON
Pin 1
Silver Mark