Recent content by oso0690

  1. O

    Masters in Control Engineering: Schools, Online & MEE Comparison

    Okay, maybe someone can help with finding a distance learning school that has similar courses to these schools: http://engr.isu.edu/gp/ms-mce/curriculum/ http://ese.wustl.edu/graduateprograms/Pages/MSinControlEngineering.aspx...
  2. O

    Masters in Control Engineering: Schools, Online & MEE Comparison

    I'm wondering if anybody can list some schools that offer a Masters in Controls Engineering. Preferably without a thesis and 100% online. Also, how would a Masters of Electrical Engineering (MSEE, M.eng) compare to a more specific degree (such as controls, mechatronics, etc.)?
  3. O

    Engineering Electrical Engineer Certifications?

    I'm wondering what are some recommended certifications a soon-to-be college grad should get as an electrical engineer besides an E.I.T.?
  4. O

    Is there a way to reduce no load power in a wireless cell phone charger?

    Frequency is 170 kHz and I'm charging at 100 - 200 mA
  5. O

    Is there a way to reduce no load power in a wireless cell phone charger?

    Thanks for the reply, I looked into reducing the current charging when the battery is full. My team had assumed that the battery would not accept anymore current when it is full. I found some answers that seem to make sense here...
  6. O

    Is there a way to reduce no load power in a wireless cell phone charger?

    Exactly. Garlic solution is hilarious lol. @Mike In Plano - I'll see how a timer works out. Even 1s checks would work much better than no checks at all! Oh, here's a circuit schematic attached. *BTW, does the simulator account for effective resistance in a coil?
  7. O

    Is there a way to reduce no load power in a wireless cell phone charger?

    Hey guys, I've been building a circuit for a wireless cell phone charger. It's nearly completed but I don't know how to stop the circuit from drawing any power from its source when the phone is not 'connected'. It actually draws more power when it's not. How do I go about creating a circuit...
  8. O

    Oscillator / Power Amp circuit voltage swing problem

    I finally solved the main problem I was having with connecting the oscillator to the power amp. I needed a buffer amplifier between them as well as drop the biasing diodes in the power amp. My professor said that crossover distortion is nearly eliminated with a tuned circuit. Attached is the...
  9. O

    Oscillator / Power Amp circuit voltage swing problem

    Oops, missed that question. Thanks for directing to it, I overlooked this part of the project. My only question on this is what is defined as the "final radio frequency stage?" The input to the transmitter? I'm not sure about the spectral purity. My professor said that when the...
  10. O

    Oscillator / Power Amp circuit voltage swing problem

    My professor gave me a way of finding the k value using the coils and an inductor analyzer. Using the same distance we'll be using in our final design, I measured the k value by first finding the value of the total inductance seen with the secondary coils shorted. He defined this as Ls. Then...
  11. O

    Oscillator / Power Amp circuit voltage swing problem

    Wow thanks a lot guys. After I change things up and test the physical system, I'll let you know how it goes! As well as possibly more questions :)
  12. O

    Oscillator / Power Amp circuit voltage swing problem

    @sophiecentaur - Okay, I assumed that the mutual and self inductances were all that was needed to describe the transformer. I'm not sure what the differences are between V.I and VI? I was looking at Vrms and Irms on the transmitting and receiving coils and Vdc and Idc at the output. Do...
  13. O

    Oscillator / Power Amp circuit voltage swing problem

    Thanks guys. I changed/added some things in the circuit that fixed the problem. Another problem was that the two oscillating capacitors were reversed. I ran into another problem though. Here's what I'm doing: Oscillator -> Power amp -> Transmitting coil -> Receiving coil -> Rectifier ->...
  14. O

    Oscillator / Power Amp circuit voltage swing problem

    You're right. I didn't even see that. I changed it but it gives the exact same output as before.
  15. O

    Oscillator / Power Amp circuit voltage swing problem

    Hey guys, I'm designing a wireless cell phone charger that can be used inside a car for the senior design project. I'm feeding 12V DC into a colpitts oscillator which is fed into a B class power amplifier which will then be fed into the transmitting coil. Each one works great independently...
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