Challenge -Group Resistors

Discussion in 'General Electronics Chat' started by dandrade, Jun 8, 2008.

  1. dandrade

    Thread Starter New Member

    Jun 8, 2008
    1
    0
    [​IMG]
    Schematic:
    http://img65.imageshack.us/img65/2761/resistorreednfru7.png

    Objective, it find worthy group of resistors.

    Condition: The total or partial sum of the values of R never must equalize.

    Sample 3 elements:
    R1+R2+R3 result not equal R1, R2, R3 or R1+R2 or R1+R3 or R2+R3

    For know values resistor check class resistor this page
    http://www.logwell.com/tech/components/resistor_values.html

    For make group use Class E24 5% or E48 2%. Not mix class.

    So far, get 5 elements for 5% E24 class...,possible get more?

    Not is combination 2R or R-2R values. (Traditional A/D system)

    This for replace the electric connection (traditional) of electric switches of a house, through circuit. Also, level meter function, with floats magnetic

    Tranks help.... link tool for calculation
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Have the resistors be binary weighted.
    start with a value - say, 100 Ohms.
    The next resistor should be double that resistance. 200 Ohms is a standard value.
    The next resistor should be double the prior value. 390 is likely close enough.
    Double again; 820 is the closest.
    The next would be 1.6k.
    So, no matter what combination of switches you had open or closed, the resistance across the network would result in a unique value.
     
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