              RESISTOR FINDER, Version 1.0, June 1997
              By Bertrand Zauhar, eng.  VE2ZAZ
              Laval, Quebec, Canada.
              Internet: zaub@nortel.com

Resistor Finder is a program that allows the electronics 
designer or hobbyist to find a combination of 2 resistors 
that, when connected in parallel, will provide the best match 
to a desired resistance. 

The program uses standard resistor values. Three banks of 
resistors are available for the search: 10%, 5% and 1%. 
The 10% bank contains 12 resistors, the 5% bank contains 24 
resistors, and the 1% bank contains 96 resistors.  


FUNCTIONS

Two functions are supported:

-The first function (labeled "2 UNKNOWN") allows the user 
to find a resistance value by letting the program pick any 
2 resistors freely. This option is useful when a non-standard 
resistance is required in a circuit.

-The second function (labeled "1 KNOWN") allows the user 
to find a resistance value by forcing one of the two resistors 
to a known value and letting the program find the second resistor. 
This option is useful when a resistor is already in a circuit, 
and another resistor must be added in parallel without replacing 
the first one.


RESULTS

The results zone is located in calculation windows, to the 
right of the the "Calculate =>" button. It is made of the 
following:

-Resulting R: This is the calculated resistance obtained by 
combining Resistors R1 and R2 in parallel, assuming perfect
resistors.

-Resistor R1, Resistor R2: The two resistors that, when 
connected in parallel, will result in resistance R. When function
"1 KNOWN" is selected, Resistor R1 is entered by the user, and 
Resistor R2 is picked by the program. When function "2 UNKNOWN" 
is selected, Resistors R1 and R2 are picked by the program. 

-Min. Error: This field represents the error from the desired 
resistance assuming that resistors R1 and R2 are of exact specified
resistance (perfect resistors).

-Max. Error: This field represents the error from the desired 
resistance when R1 and R2's resistances are at the limit of their 
specified tolerances (as per color band). This represents the worst 
case scenario.  

