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7404 Hex inverter stuck on 2.5v

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Discussion in 'Electronics Homework Help' started by evilmorty, Apr 14, 2016.

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  1. Apr 14, 2016 #1
    evilmorty

    evilmorty

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    Apr 14, 2016
    Hi,

    I got a problem with the hex inverter. The idea is to clearly define the pulses coming in from a few optical encoders working on phototransistors, but I'm having a problem where 7404 output suddenly settles to around 2.5v.
    Would anyone have any guidance on how i can fix this issue?

    Many thanks
    Morty
     
  2. Apr 14, 2016 #2
    Anon_LG

    Anon_LG

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    Jun 24, 2014
    Could you provide us with a circuit diagram please?
     
    Arouse1973 likes this.
  3. Apr 14, 2016 #3
    evilmorty

    evilmorty

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    Apr 14, 2016
    It's basic I don't have any external components such as pull up/down resistors
    image.jpg

    The inverter outputs will go into the MCU or a LS7084 clock converter that will take the A and B channels and make one pulse. I've yet to get to that stage to decide what will work best
     
    Last edited: Apr 14, 2016
  4. Apr 14, 2016 #4
    Alec_t

    Alec_t

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    Jul 7, 2015
    Have you checked that with a 'scope? If the output were oscillating and you checked with a DMM, 2.5V would be a reasonable measurement.
     
    (*steve*) likes this.
  5. Apr 15, 2016 #5
    evilmorty

    evilmorty

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    Apr 14, 2016
    Yes I'm using a scope to measure the voltages
     
  6. Apr 15, 2016 #6
    Alec_t

    Alec_t

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    Jul 7, 2015
    Have you left any of the unused inverter inputs floating? That might produce weird results.
     
  7. Apr 15, 2016 #7
    duke37

    duke37

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    Jan 9, 2011
    Is it a 7404 or a 7414 as in your diagram?
     
  8. Apr 16, 2016 #8
    Colin Mitchell

    Colin Mitchell

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    Aug 31, 2014
    Take everything off the chip and put 1k between input and 5v rail. What is the output ?
    Put 1k between input and 0v rail. What is the output ?
     
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