Download 2b) Electronic Parts - Department of Agricultural and Biological

ABE425 Engineering Measurement
Systems
Electronic Parts
Dr. Tony E. Grift
Dept. of Agricultural & Biological Engineering
University of Illinois
Experiment board for 40-pin DIP PICs
DB25 pin connector
PIC Microcontroller
40 pin Dual in Line Package (DIP)
Pin 40
Pin 21
Notch
Pin 1
Pin 20
Resistors
Values
Color coding
Power (Watt)
Power = U*I
Purpose: Control current and voltages
Variable resistor
Aka Potentiometer
Aka trim pot
Bottom pin is the wiper (runner)
Value is 102
This means 1 0 with 2 zeros
This one is 1000 (Ohm)
Avoid making short cuts !!
Capacitors
Small caps count from pico-Fahrad
This one is 10 pF
Remember
Pico
=10^-12
Nano
=10^-9
Micro
=10^-6
Milli
=10^-3
Electrolytic capacitors
These have a polarity!!
Short wire is always GND!
This one is a radial version
Filter, for instance to remove noise.
Block DC components in signals
Axial Electrolytic capacitor
Mind the polarity, wires can not be compared
Voltage converters
1. 7805 Regulator ($1,50)
2. These can get hot! Put a heat sink if neccesary
3. Max output current about 1.5A
Heat sink
IN GND 5V OUT
Purpose: Keep constant output voltage while input voltage
varies (even oscillates)
741 OpAmp
Purpose: Amplify signals, act as a buffer
DC-DC converters
1. Expensive
($50)
Light emitting diodes
This is a diode, which happens to
light up
Flat spot indicates GND
Short wire indicates GND
Avoid making short cuts, always put
a resistor in series (470  (Ohm))
LED needs about 10 mA to light up
Single row header
For making connections
Crystals
Crystal 20 MHz
Needs capacitors to work
Canned version 40MHz
just apply Vcc, no caps needed
Purpose: Generate very precise clocks for telecommunication,
microcontrollers etc.
CMOS chip (4050)
Specs: CMOS Logic Data book
Purpose: Amplify signals, act as a buffer
Homework
Find the datasheets of the following chips
Give the pins for the Vcc (power) and GND
741 OpAmp
14050B CMOS Buffer
7400 NAND
7404 HEX Inverter
7413 4 input NAND
7432 AND
BJT transistors
Crystal
Resistors
Jumpers
7805
7-seg displays
Elcaps
LCD
Resistor
Network
DIP
switch
3mm LED
Trim pot
Processor
Capacitor
Sockets
ABE425 Engineering Measurement
Systems
Electronic Parts
The End
Dept. of Agricultural & Biological Engineering
University of Illinois