Transistor

Discussion in 'The Projects Forum' started by ching fong kee, Jul 4, 2010.

  1. ching fong kee

    Thread Starter Member

    Jun 23, 2010
    42
    0
    hi,
    im having a temperature sensor, then in programming part it will on the transistor in the sensor circuit when the temperature is reached the desired value.
    so is it the voltage in Transistor will increase to 5V?
     
  2. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47
    I think a clearer statement of your problem would help. Also perhaps so help with your english. I am not able to figure out what the question is.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    I think the OP wants 5V when the temperature hits a certain temperature. Why use a transistor when there are ICs that do this job off the shelf I do not know.
     
  4. ching fong kee

    Thread Starter Member

    Jun 23, 2010
    42
    0
    sorry, actually i'm trying to say if the output voltage of the temperature sensor is 0.45V.
    so, is the the transistor can give an output of 5V if the output voltage of the temperature sensor is go through the transistor?
     
  5. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Nope, though you might be able to get a germanium transistors to do it. Silicon diodes have a breakover voltage of .6V (give or take) before they start responding.

    Operational amplifiers sound like the ticket to me.

    It would help if you could post your concept in a drawing. Schematics are the language of electronics.

    If the transistor was already biased on (that pesky 0.6V I mentioned) you could get a transistor circuit to respond very will to the small change you are talking about.
     
  6. ching fong kee

    Thread Starter Member

    Jun 23, 2010
    42
    0
    i see...thanks a lot ya..
     
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