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Thermistor Voltage Supply Question

Discussion in 'Electronic Basics' started by Terminal Crazy, May 8, 2010.

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  1. Hi guys,
    quick question for the experts.

    I'm playing with a system of thermistors feeding an RS485 Networked ADC to
    my computor.

    My supply is 5V with a 47k resistor as a Voltage divider with the
    thermistor acting as the low side.

    Q: Can i use the same resistor to feed multiple channels or is it better to
    use a seperate one for each channel?.
    I'm only useing std cheap resistors but they vary ie 46.1k and 46.3k for
    47k resistors.
    If i feed off the same one I can use the same values in my temperature
    calculation rather than having to measure each one.

    Any thoughts please.
  2. Sjouke Burry

    Sjouke Burry Guest

    Use a current mirror(google) to feed each termistor.
  3. Sorry stupid question... all the inputs would be connected to the same
    point. Duh.
  4. Jasen Betts

    Jasen Betts Guest

    yes, use a CD4016 or similar to steer the current to the desired
    thermistor before reading it. (unless you're interested in measuring
    how well insulated the thermistor is)

    if you don't have control over when the device takes readings from the
    thermistors this probably won't work.

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