Recent content by JonHumphries

  1. J

    Calculating which capacitor for a project

    I appreciate your time here, thank you for the formula. I haven't come across that one yet. I'm using "Foundations of Electronic Circuits and Devices" 4th edition which probably has all of this information but I don't always know what I'm looking for. I'll investigate what you've given me...
  2. J

    Calculating which capacitor for a project

    okay I understand the voltage drop better. As discharge and recharge occur, Q and C are changing. So how did you get to 36.8%? I attached our plan. Thank you very much for all your help :)
  3. J

    Calculating which capacitor for a project

    If this gets out of hand or there is another source for this stuff, please let me know :) What causes the voltage drop? Also, I was going to build this on a basic stamp which would provide 5v DC but you think I need something that can put out more amps?
  4. J

    Calculating which capacitor for a project

    So C= T/R, C= 14(seconds)/1.32(resistance of actuator) = 10.6 Farads?
  5. J

    Calculating which capacitor for a project

    Thanks for the reply. Can you tell me the formula or program you used to do the calculations?
  6. J

    Calculating which capacitor for a project

    My daughter and I are building a little robotic arm and I want to check my math before we start ordering parts. We are using a piece of flexinal (.11 ohms resistance per inch & 12 inches long, and requires 4amps per cycle to actuate with a cycle time of approximately 14 seconds) and want to...
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