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  1. mielke

    Electric power steering

    Do electric power steering units use inverters? I’ve seen some commercial vehicle ePS unit’s talking about integrated inverters, but I was assuming ePS units operate a DCDC motor, so is there ever a need to convert to AC? I assume if it’s operating at a different voltage there may need a...
  2. mielke

    Cable selection based on current

    Hello, hoping to be pointed towards anything on the topic of power transmission selection based on current levels. I’m familiar with changing wire gauge size based on higher current, but at what point do different power transmission methods start to make commercial sense? For example when do bus...
  3. mielke

    bearing stress in slot

    is there a simple equation to use to find the average bearing stress in a slot in a plate due to a bolt loading? I've seen the equation STRESS=F/A and for small holes A=dt (where d=bolt diameter and t=thickness of the plate) but how do you apply this stress equation to a bolt acting on a slot...
  4. mielke

    PE exam requirements

    does anyone know exactly what are the requirements are before taking PE exam...is FE exam required. specifically in Texas. thanks!
  5. mielke

    AC/DC converter

    no application in particular... got some projects i'm working on that require more and more electronics, thought i'd brush up on my knowledge. and experiementing and hands-on knowledge is the way I learn best. just trying to make a general testing setup for learning.
  6. mielke

    AC/DC converter

    I see a flood of AC/DC converters out there but is there an off the shelf product that does a straight AC to DC conversion at the same voltage (over an AC input range between 0-120V). So I can plug this converter into a wall outlet at 120V AC and then plug something else into this converter...
  7. mielke

    time dependent current equation for simple battery/resistor combo

    Thanks LiteYear, I'll read over that. I've been looking at Peukert's Law but have a feeling it didn't give me what I wanted. Compositepro, let's say a NiCd. is there an empirical equation out there to give voltage for a continuous discharge to a resistor?
  8. mielke

    time dependent current equation for simple battery/resistor combo

    Thanks racookpa for the quick response... 1)1.2mA (assuming 1.2V and 1kohm) 1A) I don't have a final current I'm looking for an equation that will tell me the current at any moment in time 2) just from my experience that batteries die when used 3) looking for a theoretical solution 4) do you...
  9. mielke

    time dependent current equation for simple battery/resistor combo

    I'm having trouble finding an applicable equation to use... Let's say I have a simple circuit with a voltage source and a resistor. I know the initial voltage of the battery and the resistance of the resistor, I want to know the current (or voltage) with respect to time. what equation will...
  10. mielke

    voltage controling device

    is there a simple inexpensive electronic device that I can buy and put in series with an wall outlet that can produce a voltage from 0-120V by turning a dial or something simple. I'm thinking something simple like a dimmer switch, but I know those only vary voltage over a small range. Thanks for...
  11. mielke

    Watt equation applied to incondescence light bulb

    How could I calculate the minimum voltage required to light up a simple 60W tungsten incandescent light bulb, assuming that I have a wire and a variable voltage source? I could set up an experiment and connect the bulb to the voltage source and slowly crank up the voltage from zero until I see...
  12. mielke

    the simplest way of creating ac from dc

    I'm am trying to understand electronics by playing around with them, and I want to know the very simplest way of creating any periodically time varying current (AC)from a DC power source. I don't care about the shape or amplitude of the AC currnet as long as it has a periodic frequency... Ive...
  13. mielke

    Current in an antenna

    Waross, by detecting do you mean a noticeable current is flowing thru it? What is defined by a working radio receiver? A metal pole? Does it need to be a closed circuit? Grounded? Etc?
  14. mielke

    Current in an antenna

    yes...I dont want to build one i want an understanding of the physics behind it (which those forums didn't provide). I've seen prepackaged circuits with a lot of stuff in it but very little on the actual simple thoeries. I realy just want to know if I have a room full of radio waves and a metal...
  15. mielke

    Current in an antenna

    maybe i didn't word my question clearly...Ive seen people make small circuits with a clock or light that is entirely powered by an antenna converting radio waves into a current. Im interested in how that happens on a very basic level, say I start with a room full of radio waves and a metal pole...
  16. mielke

    Current in an antenna

    Im pretty ignorant of EE... But if I have just a simple antenna thats recieving radio waves what do I have to do with the the antenna to measure a current through it that's induced solely from the radio waves. For example complete a circuit with a resistance, ground it, etc??? Thanks and I'll...
  17. mielke

    Typical intesities of electromagnetic spectrum found outside

    I understand this...but is there any guidance for 'typical' range/maximum. It seems like there would be studies done on this (radiation exposure on people). Like you said there is no typical but we should have a knowledge somewhere about maximum expected intensities of light and ultraviolet rays...
  18. mielke

    Typical intesities of electromagnetic spectrum found outside

    Does anyone know where I can find a chart of intensity vs frequency of electromagnetic radiation that can be found outside for a typical day.
  19. mielke

    Software

    What are some good commercial software for rating heat exchangers (especially air cooled heat exchangers)?
  20. mielke

    Bolt material

    Thanks all, we're using a sheet gasket (the customer requested no graphite) this is not code unit and will be in some harsh environments.

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