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Recent content by indemnity83

  1. I

    [SOLVED] Rising/Falling edge detector with positive output pulse

    VICTORY! It ended up being way simpler than I was making it. I think I was having trouble with the switch (SW2 in the attachment); I was using a mechanical switch and the bounce may have been causing me grief. I switched to using an Arduino as a digital switch (which is more representative of...
  2. I

    [SOLVED] Rising/Falling edge detector with positive output pulse

    Still having trouble. I've tried the 100pF, 330pF, 560pF, 1nF (even a 56pF for grins) ... there must be something I'm doing wrong. My breadboard is a mess because of all this experimenting, I'll tear down and rebuild it to see if I inadvertently have something out of place. I also picked up a...
  3. I

    [SOLVED] Rising/Falling edge detector with positive output pulse

    I fiddled with different r values; another odd problem crops up though in that just about anything higher than 2K on R3 (your schematic) seems to not act as a pull down, and the output is off/low. I will probably have to go run to the store and pickup a new multimeter to check some things out...
  4. I

    [SOLVED] Rising/Falling edge detector with positive output pulse

    Thanks ... added the book to my wishlist. Your design seems to work, but for some reason the falling edge isn't consistent in my breadboard hookup, might be switch bounce so I'll throw in a de-bounce circuit and see if that helps. Oddly enough the rising edge works flawlessly, but the falling...
  5. I

    [SOLVED] Rising/Falling edge detector with positive output pulse

    I'm so close now, but still lacking something basic ... just need to get the falling edge to work now; what am I doing wrong this time. I need both outputs to be negative pulses. (also ... any good resource I could dig into to figure this out on my own in the future?) **broken link removed**
  6. I

    [SOLVED] Rising/Falling edge detector with positive output pulse

    Sigh ... I have a lot to learn. That seems so obvious now that you say it. 1M ohm resistor seems to have worked like a charm too with a 100pF cap.
  7. I

    [SOLVED] Rising/Falling edge detector with positive output pulse

    Sweet, thanks guys ... so I got this working so far with the pull down resistor on pin 1 (I already had the decoupling capacitor and current limiting resistor, just didn't show it). So now, I can get understandable behavior from the following circuit: **broken link removed** So now to make...
  8. I

    [SOLVED] Rising/Falling edge detector with positive output pulse

    Rising/Falling edge detector with negative output pulse I'm either doing something wrong, fried the chip, or just am in above my head. I have an NTE74LS14 chip (Hex Schmitt Trigger Inverter http://www.nteinc.com/specs/7400to7499/pdf/nte74LS14.pdf) and was trying to following an article about...
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