Recent content by mhache

  1. M

    Engineering Help with understanding a circuit

    Again, thanks for the help. What I'm hoping to bulld is a fan sign for sporting events. The vibrator circuit (above) will flash the words (made up of one or more LEDs) alternatively. Not sure of the protocol here, if I should start a new topic, please let me know if I should. I was doing...
  2. M

    Engineering Help with understanding a circuit

    Thanks again everyone. The fog is starting to lift. After reading the wiki and The link from gneill I thinking understand the concepts. If I could beg your indulgence for a follow on question. In the diagrams below r2 and r3 act with c1 and c2 to acts as timing elements as gneill calls it...
  3. M

    Engineering Help with understanding a circuit

    Thank you both. I kind of figured it was supposed to be a multivibrator. What I'm still trying to wrap my head around is how that works with a relay. I've seen multivibrator circuits with a load between collector and ground (eg in the venerable Radio Shack Getting Started in Electronics) and as...
  4. M

    Engineering Help with understanding a circuit

    Homework Statement Hi there, I'm fairly new to electronics and am hoping to learn how the attached circuit works. It is from a Kip Kay project over at Make Magazine (http://blog.makezine.com/archive/2008/10/weekend-project-ultimate.html) I have posted the question over at the site but...
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