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You are here: Home / Topics / Controlling 12VDC 5A relay from voltage signal?

Controlling 12VDC 5A relay from voltage signal?

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Electronics › Electronics › Controlling 12VDC 5A relay from voltage signal?

  • This topic has 4 replies, 3 voices, and was last updated 8 years ago by AJISH ALFRED.
Viewing 5 posts - 1 through 5 (of 5 total)
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  • August 13, 2014 at 9:38 am #3227
    Micheal
    Participant

    Hi,  I’m not an electronics engineer, but have some knowledge and keen to learn more.  I want to control a simple relay – 12VDC 5A – in response to a control feed which varies voltage according to state.  If control signal voltage is greater than 6 vdc the relay should energise, if the control signal voltage is less than 1.5 vdc, the relay should release.  Any circuits available would be appreciated.

    August 14, 2014 at 7:30 am #12010
    AJISH ALFRED
    Participant

    Use schmitt trigger circuit, it can be easily made using 555.

     

    Scmitt Trigger circuit using NE 555

    http://www.allaboutcircuits.com/vol_6/chpt_8/2.html

     

    Use a transistor at the output of 555 to drive the relay

     

    August 14, 2014 at 7:38 am #12012
    Ashutosh Bhatt
    Participant

    you can use LM741 chip as comparator. and set its input voltage as you require. you can set the output high till input is more then 6 V and set output low when input is lower than 1.5 V. use this output to energize relay coil.

    August 14, 2014 at 12:44 pm #12017
    Micheal
    Participant

    Thank you Both.

     

    I’ll have a play and report back.

    August 16, 2014 at 3:40 am #12021
    AJISH ALFRED
    Participant

    You are welcome Micheal, waiting for your update.

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