ADVICE NEED ASAP (its an emergency)

Discussion in 'General Electronics Chat' started by brendyboy, Apr 19, 2006.

  1. brendyboy

    Thread Starter Member

    Dec 21, 2005
    27
    0
    I need someones advice!!!

    Im working on a project which needs a temperature control circuit to activate a relay. The project is due in next week so i desperately desperately need someones help!!!! please please please!!

    http://www.electronic-kits-and-projects.co...s/1000/1048.pdf is a link to the info sheet of the circuit i have purchased. However the temperature range of this circuit is 20-80 degrees and i need it within 2-8.
    I heard that i only need to change the variable resistor (is that also called a potentiometer?) to a 4.7k. Would that work?
    Basically i need the relay to switch when the temperature gets to about 8 degrees and then switch back when it gets around 4.

    Please also understand that I do not wish to over complecate it as I know nothing about electronics (wish i listened in class now) so im after the simplest solution!!

    Would really appreciate any help!!
    Many thanks
    Brendan
     
  2. brendyboy

    Thread Starter Member

    Dec 21, 2005
    27
    0
    Forgot to mention the thermistor is negative coefficient

    At room temperature it is 1k
    at 0 degrees it is 2.7k
     
  3. paultwang

    Well-Known Member

    Mar 8, 2006
    80
    0
    The requirement looks like a refrigerator thermostat.

    You have provided no component values. It is difficult to answer.

    Call the company and talk to their engineer.
     
Loading...