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  • ORing 555 outputs?

    Lem0nHead

    Member

    Updated: Oct 19, 2024
    Views: 1.1K
    hello
    I want to OR three 555 outputs
    for example, I have a LED that should be on when ANY of the 555 outputs (pin 3) is on

    do I need to use a logic OR or would it be ok to just connect the 3 outputs together?
    maybe with a diode to protect the pin 3?
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    Replies
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Replies

  • sauravgoswami

    Member • Jun 1, 2009

    If you are using a single LED then you can use an OR gate or a multiplexer,and if you are using individual leds then there is no need of that as you simply connect the LEDS to the IC 555,through a resistor and a diode if needed
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  • Lem0nHead

    Member • Jun 1, 2009

    sauravgoswami
    If you are using a single LED then you can use an OR gate or a multiplexer,and if you are using individual leds then there is no need of that as you simply connect the LEDS to the IC 555,through a resistor and a diode if needed
    it's a single LED
    I tried connecting the 3 outputs together with a diode (to protect pin 3) and it worked
    is it a nasty solution that may overheat, or something like that?
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  • sauravgoswami

    Member • Jun 1, 2009

    well then use a three input OR gate it will be simple and better option,make sure to supply to LED through a resistor!!
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  • Ashraf HZ

    Member • Jun 1, 2009

    Yeah, a cheap CMOS 4071 chip will do. Just chain two of the gates together 😀
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  • swapnakumar

    Member • Jun 1, 2009

    yes u can OR the outputs and then connect the output to a led to indicate on/off condition
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