6v window comparator circuit

Discussion in 'The Projects Forum' started by Viktor Vaughn, Apr 9, 2015.

  1. Viktor Vaughn

    Thread Starter New Member

    Mar 21, 2015
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    I want to construct a 6 volt monitor using 741 op-amps in a window comparator configuration, with an bi-color LED. I want the LED to burn green above 3 vots, red below 5.7 volts, and orange between 3 volts and 5.7 volts. Can anyone please point me in the right direction to accomplish this. Any resources or guidance would be most appreciated.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,006
    3,232
    What is the supply voltage(s) for the op amp.
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    You need to re-think your requirements. For any voltage from 3V to 5.7V both read and green LEDs will light. What happens below 3V or above 5.7V?
    Do you intend to power the opamps from the 6V source you are monitoring, or will they have an independent supply (e.g. 9V)?
     
  4. Viktor Vaughn

    Thread Starter New Member

    Mar 21, 2015
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    I want the opamps to operate from the 6 volt source, and the bi color LED will burn orange between 3v-5.7v
     
  5. Viktor Vaughn

    Thread Starter New Member

    Mar 21, 2015
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    6 volts
     
  6. ScottWang

    Moderator

    Aug 23, 2012
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    Is this a homework or personal use?
    Why you not just change to LM393 or LM339 or even LM324?
     
  7. frpr666

    Active Member

    Feb 2, 2010
    37
    6
    These comparators are easy to build with comparator (or op. amp.) and voltage reference.
    I'm sending a pic. for discussion.:)
    edit1: I think an attiny13A and a 7805 would be also solution.
     
  8. Viktor Vaughn

    Thread Starter New Member

    Mar 21, 2015
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    Thank you so much! I strongly appreciate this. As an upcoming engineer, I am still wet behind the ears and have a lot to learn.
     
  9. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Ok, for any voltage from 3V to 5.7V both read and green LEDs will light to make orange. But which LED (if any) should light below 3V or above 5.7V?
     
  10. Viktor Vaughn

    Thread Starter New Member

    Mar 21, 2015
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    I did some rethinking and I decided to use a lm3914 for my monitor. But I really appreciate you helping me.
     
  11. ScottWang

    Moderator

    Aug 23, 2012
    4,854
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    You may search LM3914 at the top right corner to see how others used the same ic.
     
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