EET References

SI Units Reference - Standards, History, Usage, Style.   From the NIST (National Institute of Standards and Technology)

Units of Measurement    Very interesting and informative site describing the common and uncommon units.  With many hyperlinked terms. Good review of SI units and other measurements.

Online Unit Convertors:
AskNumbers.com
OnlineConversion.com
UnitConversion.org
Unit-Conversion.info

SI Prefixes and Symbols download as a pdf Chart showing wide range of magnitudes expressed in "engineering" notation - that is, using only multiples of three in the exponent. All values encountered in our EET courses will be within the middle box.

DataSheets of selected integrated circuits used in our courses.

Voice Chip manufacturer    Nuvoton - manufacturer of the ISD series of ChipCorder® voice recorder I.C.’s.    We use the ISD1760 (28-pin DIP) which allows a recording time of up to 60 seconds.  These voice recorder I.C.s are available from Digi-Key Corp.

Chip Directory    Excellent cross reference for integrated circuits.

Capacitor Coding   Shows how to determine the value of a disc ceramic, mylar or similar type capacitor when only the shorthand codes are stamped on the cap. body.    Also shown is a table of Capacitance Tolerance codes.

555 IC - Timer Calculators
Interactive online calculators (and schematics) for monostable or astable operation of the LM555 timer IC.
(Many, many more calculators are available here).
Monostable 555 Calculator   Time delay or one-shot
Astable 555 Calculator   Free-running square-wave oscillator
555 Frequency & Duty Cycle Calculator   with pin function descriptions

Bowden's Hobby Circuits   Many circuit ideas, electronic reference data, and tutorials
    RC calculator
    Voltage Divider Calculator

Here's a little Javascript based calculator which you can use to find the equivalent resistance of two resistors in parallel.
Instructions: Enter R values w/o prefixes.
ex. 4700 or 4.7e3 NOT 4.7k
This calculator can also find the R value (R1 or R2) you need to connect in parallel with a known resistor to attain an entered Req value. eg. Enter R1=220 Ohms, Req=150, and clear any numbers R2. Click on SOLVE to find the R2 value (~470 Ohms) which when connected in parallel to R1 gives Req = 150 Ohms.
Two Resistors in Parallel
R1 = R2 = Req =

LaTeX 
LaTex Equation Editor   -   Just enter your LaTeX code and instantly see the formatted equation in the window below.  The equation appearing in the window can be copied as a graphics image and inserted into documents.
Just click on ==>Launch CodeCogs Equation Editor
It will open an editor in a new Javascript window where you can type your LaTeX coded equations.
For help with LaTex commands try this wiki:http://www.artofproblemsolving.com/Wiki/index.php/LaTeX:Commands
Many other sites have tutorials on using LaTex.

We use Electronics Workbench  and  NI (National Instruments) Multisim on our lab computers for circuit simulation and schematic capture.

Sites with free schematic capture (not simulation) software include:
(Both of these programs also include printed circuit board layout tools;
 which are not used in our courses.)
          ExpressPCB ..... Schematic capture program 
          PCB123     ........  Schematic capture program

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