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  1. Arouse1973

    Help with Burned out 3000 watt inverter

    Ok no probs, I'll keep digging about. Adam
  2. Arouse1973

    PCB Layout Help

    Yes spot on Kris. Fast rising edges can cause allsorts of EMI problems.
  3. Arouse1973

    Integrator circuit using single resistor gain"ad620" op amp?

    Nice one Laplace. The output of the Rogowski coil is generally very small so we are right down the very bottom left of your graph which is where it's always more linear. And the reduced gain at low frequencies I believe helps with low frequencies interference pickup. So that's why you don't need...
  4. Arouse1973

    PCB Layout Help

    Very likely. Thanks Adam
  5. Arouse1973

    Help with Burned out 3000 watt inverter

    Oh Oh don't these look similar? http://www.irf.com/product-info/datasheets/data/irfp3206pbf.pdf Adam
  6. Arouse1973

    PCB Layout Help

    I think your right about the noise from the switcher. Your crystal layout has some issues. Noise could be quite easily coupled onto these lines, they run very close to the ground plane which could have switching noise on it. Also the top crystal track runs very close to a track from U3 which is...
  7. Arouse1973

    Integrator circuit using single resistor gain"ad620" op amp?

    Here is my attempt as working some of this out. It appears that you don't need as much gain as first thought to process the coils output. Values I have used seem to be a common choice. Thanks Adam
  8. Arouse1973

    High Frequency Amplifier

    A circuit diagram and picture of the PCB layout would be good. Adam
  9. Arouse1973

    Help with Burned out 3000 watt inverter

    The IC could be a 4093 I have seen these driving smaller fets that drive the bad boys. Adam
  10. Arouse1973

    sampling communication lines without interfering the signal

    Just looked up Hotshoe. Does it use data or is it a level? I noted you said data packet. Adam
  11. Arouse1973

    sampling communication lines without interfering the signal

    I am not familiar with the Ardunio but if it inputs are the same as a micro then you should be able to connect straight to the data lines. But how the data is transmitted I dont know, is it just clock and data? You may need the clock also to work out the data. Adam
  12. Arouse1973

    linear motion sensor- help

    I know a few humans that are cold and lifeless :) Adam
  13. Arouse1973

    PCB Layout Help

    Yeah also post a picture of your layout both sides, a good screen grab will be ok. Adam
  14. Arouse1973

    Integrator circuit using single resistor gain"ad620" op amp?

    Ah yes this is interesting, so he will be integrating the voltage produced by the coil to give a voltage on the output of the integrator that is proportional to the current in the coil. He will also need a resistor across the capacitor to limit the gain at low frequencies It appears this is...
  15. Arouse1973

    Integrator circuit using single resistor gain"ad620" op amp?

    Ah you were talking about an ideal op amp, don't find many of them lying around :) Adam
  16. Arouse1973

    Integrator circuit using single resistor gain"ad620" op amp?

    Hi LVW Phase shift of 90, what at all frequencies? cheers Adam
  17. Arouse1973

    Help please with transistors

    What battery does it charge BTW
  18. Arouse1973

    Help please with transistors

    Ebay seem to have both. The A1015 is a epitaxial transistor, dont quite know why its used in a battery charger. Maybe some of the other guys might know. I'll see if I can draw a circuit for you over the weekend. But Kris will probally be on soon and beat me to it, he loves this sort of thing. Adam
  19. Arouse1973

    Electronic power and resistance rules

    Looking good Lavaguava. Thanks Steve I have nothing to post now, only this :) Excellent comments BTW. Adam
  20. Arouse1973

    Using a bipolar transistor to turn a load on and off

    Yes indeed, you would need to increase the base voltage to saturate it, which could be quite considerable for high load currents. Adam
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