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 with many hyperlinked terms. Good review of SI units and other measurements.

Unit Conversions - online calculators
AskNumbers.com
OnlineConversion.com
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     Winbond - manufacturer of the ISD series of ChipCorder® voice recorder I.C.’s.  We use the ISD2560 Series which give a record time of 60 seconds.

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.

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
Yet another 555 online calculator   Monostable and Astable

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 =

We use Electronics Workbench in 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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