Selecting High impedance Resistors

Discussion in 'The Projects Forum' started by rigers, Sep 11, 2012.

  1. rigers

    Thread Starter New Member

    Jun 14, 2011
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    Hi,

    I want to be able to select one of 7 different Resistors at a time. I thought I could use a multiplexer but the resistances vary from 10 Mohm to 1kohm. The problem is that the impedance of the switches is about 1-2 Mohm when off and being in parallel it affects the resistances. I need something that has a much higher off resistance. I was looking at the CLV4051 from TI but that one has the low resistance. I found some reed relay modules, RM05-8A from Meder, but they are expensive. I was just wondering if anybody had a similar problem and how they solved it.
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    rigers likes this.
  3. WTP Pepper

    New Member

    Aug 1, 2012
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  4. rigers

    Thread Starter New Member

    Jun 14, 2011
    20
    0
    They don't have to be very fast above 100 microseconds.
     
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