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ORing 555 outputs?

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?

Replies

  • sauravgoswami
    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
  • Lem0nHead
    Lem0nHead
    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?
  • sauravgoswami
    sauravgoswami
    well then use a three input OR gate it will be simple and better option,make sure to supply to LED through a resistor!!
  • Ashraf HZ
    Ashraf HZ
    Yeah, a cheap CMOS 4071 chip will do. Just chain two of the gates together 😀
  • swapnakumar
    swapnakumar
    yes u can OR the outputs and then connect the output to a led to indicate on/off condition

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