How to use logic

Discussion in 'General Electronics Chat' started by mkenney, Feb 14, 2009.

  1. mkenney

    Thread Starter Member

    Feb 14, 2009
    How do you figure out the value of the resistor that is needed to pull the voltage to high yet still let the device switch it to low? My application has 5V input and the .8 max off state and 2-5 volt on state like described. I'm using a 10k resitor as currently suggested but get .524 volts out so the logic is stuck on off. When I tried a lower value resistor to attempt to up the voltage I ended up burnning the hall effect switch that I was trying to use.

    Mark [mkenney]
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Pleas do no hijack existing threads. It is confusing to know who is replying to what.

    This is the thread that got hijacked -

    A sensible answer to your question isn't possible. We don't know the logic family you are trying to use, the reason for that pull up resistor, and how things are being done.

    Can you post up a schematic?