very simple logic probe ttl and cmos with pulse detection

Discussion in 'The Projects Forum' started by lokeycmos, Mar 15, 2011.

  1. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
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    im building a logic probe for my digital electronics class. i have found TONs of circuits on the internet. many of them are quite complicated. im hoping someone could take the time to post a schematic that is as simple as possible but still has these features: ttl and cmos levels, high and low leds, and preferred but not absolutly neccesary, pulse detection. TY :)
     
  2. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    Yours is a class assignment. We will not simply give you a circuit. This is because you will not be learning anything that way. You must make the initiative by posting your own circuit. Then the membership will then critique it.
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
    432
    7
    my post was a little misleading. its not an assignment. im building this independantly, just cause i like building things.
     
  5. CDRIVE

    Senior Member

    Jul 1, 2008
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    Well that's a horse of a different color. Anyway, the approach that Bertus took is the slickest I've ever seen.
     
  6. someonesdad

    Senior Member

    Jul 7, 2009
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    I agree; Bertus, that's just plain clever!
     
  7. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
    432
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    can this circuit be easily modified for pulse detection as well?
     
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  8. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Did you have a look at my circuit?
    As you can see there is a part for detecting high and low
    AND a retrigable monoflop to make the pulses visible (even needle pulses).

    In the circuit you posted the monoflop part is missing.

    Bertus
     
  9. raffter

    Active Member

    Feb 28, 2008
    113
    0
    smart way of implementing pin5 of the 555 timer!
     
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