LM567C Problem!

Discussion in 'The Projects Forum' started by emilj726, Apr 24, 2014.

  1. emilj726

    Thread Starter Active Member

    Oct 1, 2010
    52
    2
    Does anyone know if I can feed a 5V P-P square wave into an LM567?
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,090
    3,027
    Aren't you really asking what the output will be, if you do?

    If you're concerned about the voltage, you could just divide it down by 50X.
     
    Last edited: Apr 24, 2014
  3. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    In the datasheet is given that the input must be between 25 and 200 mV.

    Bertus
     
  4. emilj726

    Thread Starter Active Member

    Oct 1, 2010
    52
    2
    Yeah I saw that I just wanted to make sure. It kind of makes sense why my circuit is not working. Whats happening is I am feeding a square wave oscillator into pin 3 of LM567 with a coupling cap also. On pin 8 on the output its a square wave. The way I setup the component is so that when It detects a certain frequency in my case 150 kHz, the output will sink to Grd. Yes I do have a Pull up resistor on the output. I guess I will use a voltage divider to get that voltage down in the mV range.
     
    Last edited: Apr 24, 2014
  5. GopherT

    AAC Fanatic!

    Nov 23, 2012
    5,989
    3,734
    That is the easiest option. You might also want to look if the coupling cap is a good idea or not. I think it needs to be a DC input (no coupling cap).
     
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