Compliment to relay

Discussion in 'Electronics Resources' started by Kenah, Jan 24, 2015.

  1. Kenah

    Thread Starter New Member

    Jan 24, 2015
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    What would be the compliment to a relay
    i.e. detects a higher voltage / current and outputs a 3.5-5v digital signal?
    Thanks for help
     
  2. ScottWang

    Moderator

    Aug 23, 2012
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    What's the purpose of the relay?
    You may using a LM393 Or LM339 to detecting the Voltage and output a voltage, maybe you want to using the output voltage to drive a relay, if you do so then you should adding a bjt to drive the relay.
     
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  3. Kenah

    Thread Starter New Member

    Jan 24, 2015
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    Thanks for this - and what, please, would detect the presence on a voltage / current?
    Thanks
     
  4. ScottWang

    Moderator

    Aug 23, 2012
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    You need to specific how is the voltage and current, and describe more details about what you trying to do?
     
  5. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Look at a TL431
     
  6. wmodavis

    Well-Known Member

    Oct 23, 2010
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    In Boolean theory the complement is also referred to as the NOT function.

    Therefore based on logic to answer your question "What would be the compliment to a relay?" is NOT a relay.
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I think the OP meant Complement not compliment, subtle difference.
    So it could be all manner of solid state devices, transistor, mosfet, IC, etc?
    As asked, more info needed??
    Max.
     
  8. Chancepe

    New Member

    Jan 29, 2015
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    Consider adding a PTC fuse in the pack to prevent fires from short-circuits. Also, don't try to solder up a pack yourself. mcse The heat from soldering will damage the cell internals.
     
  9. sirch2

    Well-Known Member

    Jan 21, 2013
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    Sounds like a relay with a higher voltage coil, e.g. a relay designed with a 240v coil can switch 5V.

    However I am wondering about your use of the term "detects", perhaps you want a current transformer and a transistor to do the switching.
     
  10. MrChips

    Moderator

    Oct 2, 2009
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    I still don't get the question.

    Would someone care to enlighten me?
     
  11. ScottWang

    Moderator

    Aug 23, 2012
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    Not just you, I already asked the details in #4, but there is no response, does you think will this become a dead thread?
     
  12. wmodavis

    Well-Known Member

    Oct 23, 2010
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    The "?" in the OP would be suggestive of someone asking a question.
    However I have done a thorough analysis of the word and letter patterns and the evidence is conclusive.

    It is a mish-mash conglomeration of the same and the "?" is just a decoy.
     
  13. MrChips

    Moderator

    Oct 2, 2009
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    So, in decoding the OP, I make the assumption that is an issue with the English language.

    So the OP is really asking, "How does one detect a high voltage/current and output a logic signal at 3.5-5V levels?"

    Thus the reference to a "compliment to a relay" is unimportant.

    The simple solution is to use an analog comparator such as LM311, LM2901, LM339, for example.
     
  14. wmodavis

    Well-Known Member

    Oct 23, 2010
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    With the mish-mash conglomeration whether due to language (likely) or other possible causes, your guesses, my guesses and anyone guesses on what was on the mind of the thread starter have more or less equal odds of passing within striking distance of the not so clear target. So guess away.
     
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