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
    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!! 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
  2. brendyboy

    Thread Starter Member

    Dec 21, 2005
    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
    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.