Challenge -Group Resistors

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

  1. dandrade

    Thread Starter New Member

    Jun 8, 2008

    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

    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


    Jul 17, 2007
    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.