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 1 Pin 40 Pin 20 Pin 21 Notch

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 Regulator ($1,50) 2.These can get hot! Put a heat sink if neccesary 3.Max output current about 1.5A IN GND 5V OUT Heat sink 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 Canned version 40MHz just apply V cc, no caps needed Crystal 20 MHz Needs capacitors to work 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 input NAND 7432 AND

3mm LED Resistor Network DIP switch Trim pot Processor Sockets 7-seg displays 7805 Elcaps LCD Crystal Jumpers BJT transistorsResistors Capacitor

ABE425 Engineering Measurement Systems Electronic Parts The End Dept. of Agricultural & Biological Engineering University of Illinois