Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by KnoItAll

  1. KnoItAll

    How to measure capacitor ripple current

    I wonder if one could measure the voltage ripple, then divide by the total impedance of the component (including capacitance, ESR & ESL). Shouldn't that give the current ripple? i = C dv/dt
  2. KnoItAll

    LEDs turning off causes EMC problem?

    Some ideas... 1. put some inductance in series with the LEDs 2. use your voltage source to drive a current source, then connect the LEDs. http://en.wikipedia.org/wiki/Current_source
  3. KnoItAll

    charging a capacitor with a small voltage

    Use a boost converter http://en.wikipedia.org/wiki/Boost_converter The motor inductance can be used as all or part of the boost converter inductance. Generate a square wave of a suitable frequency and use it to drive a transistor that shorts out the motor. When the transistor opens, the diode...
  4. KnoItAll

    thermal coefficient of resistance of stainless steel

    This is a reply to: thread723-145632 I assume that when using the thermal coef of electrical resistIVITY to calculate the thermal coefficient of electrical resistANCE, the coef of thermal expansion has to be taken into account. For the thermal coef of resistIVITY, I get 0.104% /deg.C For the...

Part and Inventory Search