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  1. BobK

    Design of three stage 60 GHz Power Amplifier for use in 4G

    I am no expert, but at those frequencies, I don't think a schematic is enough -- the physical layout is a critical. Bob
  2. BobK

    using SIPO LED driver with PIC controller

    If you are shifting the data in, the PIC will only be driving 1 input.\\ Edit: Never mind, you are talking about 49 latch inputs on the 49 chips. Bob
  3. BobK

    Woo-Woo Why are there countless attempts to make magnets power generators..

    This is just rephrasing what others have already said, but maybe you can imagine this, or even set up an experiment based on this. Let's think of a wheel with one magnet on it's rim, N pole facing outwards. And a fixed magnet mounted just outside the diameter of the wheel with the N pole...
  4. BobK

    Woo-Woo Why are there countless attempts to make magnets power generators..

    Sorry I somehow sent the message before I finished. I have edited it to complete it now.
  5. BobK

    Need assistance with a project

    Still makes no sense. Why not have your brother describe what he is trying to do wihout you filtering it. Bob
  6. BobK

    Woo-Woo Why are there countless attempts to make magnets power generators..

    Any magnets you place neer a spinning wheel might give an added force to speed it up at some point in the rotation, but they will give a force to slow it down in another position. One rotation of the wheel and they all add up to zero. Read up on "conservative force". The rule is that no...
  7. BobK

    Mobile phone detector doesn't work properly

    Studies have been done, they have shown no increase in brain cancers. People think all radiation is the same. It is not. UV-radidation, X-rays and Gamma-rays cause cancer. Microwave do not, cannot, because they cannot deliver enough energy to break a chemical bond. Sunlight is FAR more...
  8. BobK

    Mobile phone detector doesn't work properly

    How many people have been using cell-phones for how many years? And yet we have seen no increase in the occurrence of the brain cancers that some people insist they are causing. Draw your own conclusions. Bob
  9. BobK

    Light circuit for an art project

    You might want to think about using blue LEDs instead, they will use much less power. Bob
  10. BobK

    volts and attenuation for microphone?

    Or, calculate it! The microphone module should indicate what it's output is. Set the gain so that you get the output level you want, presumably something like 1V P-P. Bob
  11. BobK

    Determining Rectifier Size

    My Galvanic Chemistry, Just as a sanity check, let's say you create an electromagnet that runs on 110V and draws the 15 A you are talking about. That is 1650W. Go to your local big box store and get a 1500W heater. Your electromagnet will produce a little more heat than that. Are you...
  12. BobK

    Mechanical energy.

    Why is it surprising to you that a motor can lift more than its weight? Have you never driven a car up a hill? Bob
  13. BobK

    where to find bright SMD LEDs

    If you are looking for really high power LEDs, this place is great: http://www.dealextreme.com/c/flashlight-parts-and-tools-917 They will take 2 weeks or more for shipping though. Bob
  14. BobK

    What Resistors should I have

    You can get assortments really cheap on EBay Bob
  15. BobK

    Help Regarding Linear Motor

    What is it you are trying to do? Driving a generator with a linear actuator does not sound like a particularly efficient design. Bob
  16. BobK

    recreate telephone system for intercoms

    This might help. It shows what the telephone company would put on you phones. 48V plus some inductors and resistors. http://www.epanorama.net/circuits/teleinterface.html#general bob
  17. BobK

    Woo-Woo Energy loss In a circuit?

    High frequencies travel only on the outside surface of a wire. Bob
  18. BobK

    Heat... In an electrical circuit and energy transformation.

    The heat in any material is calculated from the temparature and the heat capacity of the material. http://en.wikipedia.org/wiki/Heat_capacity Bob
  19. BobK

    Frequency shifting circuit

    I believe single side band modulation would do exacly what you state here. The carrier would be 100000Hz and you would mix that with the signal, then remove everything at or below the carrier with filtering. http://en.wikipedia.org/wiki/Single-sideband_modulation Bob
  20. BobK

    Strength an of Electric motor?

    The horsepower rating of a motor tells you how much work it can go in a given time. One horsepower is 550 foot pounds per second. This means that it can lift 550 pounds 1 foot in 1 second, or 1 pound 550 feet in one second, or any combination of pounds and feet that multiply to 550 in 1...
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