Some Help about a component

Discussion in 'The Projects Forum' started by MMH, Feb 8, 2013.

  1. MMH

    Thread Starter Member

    Feb 8, 2013
    143
    4
    Hello again! Sorry for disturbing you. But can You tell me what this thing is?
     
  2. toffee_pie

    Active Member

    Oct 31, 2009
    162
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    could be a 6.8ohm ntc.
     
  3. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
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    Is this related to your battery charger question :)
     
  4. MMH

    Thread Starter Member

    Feb 8, 2013
    143
    4
    Thanks for answering. It is not sth related to the charger. I just found it in my junk box-thought of using it. By the way how can i use the 6.8ohm ntc?



    Pardon me if i have asked too foolish questions:)
     
  5. MMH

    Thread Starter Member

    Feb 8, 2013
    143
    4
    And is it a thermistor? I hope it is but i dont think it is.


    Pardon me if i have asked too foolish questions.:)
     
  6. MMH

    Thread Starter Member

    Feb 8, 2013
    143
    4
    So, whats the answer? IS it a thermistors? Sorry for repeating it. I have posted it 2 weeks back!!
     
  7. MrChips

    Moderator

    Oct 2, 2009
    12,439
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    It says 6R8Ω meaning 6.8Ω
    Measure with an ohmmeter.
     
  8. jt6245

    Member

    Feb 18, 2011
    21
    3
    I also think it is thermistor 6r8 ohm at 25'c with +- 20%
     
  9. takao21203

    Distinguished Member

    Apr 28, 2012
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    Not a thermistor, NTC to limit inrush current, or PTC to limit max. current.

    6.8 ohm not so easy to test maybe use a bulb.
     
  10. MMH

    Thread Starter Member

    Feb 8, 2013
    143
    4
    Thanks for answering!! But how can I use it with a bulb? Shall it be in parallel? Can you please suggest a circuit?
     
  11. takao21203

    Distinguished Member

    Apr 28, 2012
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    In series of course. You maybe need to try a few different bulbs.

    It will be bright then turn dim for a PTC.
    For a NTC, it will be dim at first then become brighter.

    It is normal for these components to heat up.
     
  12. MMH

    Thread Starter Member

    Feb 8, 2013
    143
    4
    Thank you very much!!

    It got brighter overtime-meaning it is a NTC. Can you now suggest a simple "circuit" using this NTC-meaning in what applications is that used??
     
  13. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
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    That's a low value, so you don't want to run much voltage on it, Ohm's law and all, at 6.8 Volts, 1 amp through it, creating 6.8 Watts of heat to be dissipated. That package couldn't withstand more than about ½ Watt. Result would be "Black thingy that used to be a Thermistor".

    It can be used as a temp sensor, with low current through it, as part of a voltage divider feeding a comparator or a microcontroller. Though, the value is very small for that purpose as well, you wouldn't get a full range easily.
     
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