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  1. Arouse1973

    How to drive an H Bridge using AOP605

    Hello. Without the BJT then the top FET (P) will have 5 volts on the gate when the micro's output is high. You have a 9 volt supply so the gate will be 4 volts lower than the source. What's going to happen to the FET (P) when this happens? Thanks Adam
  2. Arouse1973

    Using super cap for smoothing

    If they are standard super caps then probably not, the ESR is quite high on the standard types. Do you have a data sheet for them you can post here. Thanks Adam
  3. Arouse1973

    NP's of a Schematic

    In the symbol of the diode above chop it in half and throw away everything to the right. Do you see a K? Adam
  4. Arouse1973

    50Mhz Square wave generation.

    :)
  5. Arouse1973

    Why are my LTSPICE results so different from the 1N4148 datasheet and real life?

    I make mine 0.758 mV at 30 mA at 25 deg C. Thanks Adam
  6. Arouse1973

    50Mhz Square wave generation.

    He you go...
  7. Arouse1973

    Guitar Amp Power Wiring

    Also your body is a good radiator of noise also and re-radiates noise into the pickups. Keeping your hand in contact with the bridge can help if the guitar is grounded and the bridge is metal. Cheers Adam
  8. Arouse1973

    Op-Amp Help

    Have a look at the Data sheet. See if you can find a parameter called output voltage swing. That should help you. Thanks Adam
  9. Arouse1973

    SMPS

    A flyback converter uses a transformer arranged with the winding dots away from each other i.e. at opposite ends. This transfers energy to the load when the SMPS output switch (usually a MOSFET) turns off. The feed forward converter is the opposite in all aspects, They do however have some...
  10. Arouse1973

    SMPS

    Tell me more. What do you want to do. Why are you comparing SMPS and LED drivers they perform a different function. They are similar but quite different in their operation. Adam
  11. Arouse1973

    SMPS

    Got any examples of the devices you have been looking at? But if I am thinking of the same thing as you, they are constant current devices. This allows you to connect a number of LEDs in series and still push the same current through the LED string. This is suppose to help keep the brightness...
  12. Arouse1973

    Calculation of EMF by Rotating magnetic field

    Can you tell us a bit more about the project. Do you have any drawings of what you are doing. Is this using a generator of some kind... tell us more please. Thanks Adam
  13. Arouse1973

    SMPS

    Hello Explain more I can't make out what you want to know. Adam
  14. Arouse1973

    LTSpice AC simulation

    Ok no probs. Cheers Adam
  15. Arouse1973

    LTSpice AC simulation

    Hi Richard. How are you measuring the resistance of the AC source you are using in real life? I am not sure that it's skin effect. Can you draw a block diagram showing the system blocks including the antenna and where you are taking the measurements. Some pictures would be good also. Thanks Adam
  16. Arouse1973

    LTSpice AC simulation

    Just did a sim on a 2pF cap and it's reactance is 2.7 K @ 29 MHz and 19.8 K @ 4 MHz, quite close to what you want. Not sure if this helps? Thanks Adam
  17. Arouse1973

    LTSpice AC simulation

    Hello Richard I don't know a way of doing this in LT-Spice but others on here may have an answer. Could you not just put an RLC network on the output of the AC source to mimic what you want? Just a thought. Thanks Adam
  18. Arouse1973

    Circuit help

    Redraw the circuit how you think it should work first. Adam
  19. Arouse1973

    Circuit help

    Why do you have a LED on the gate? Try and draw your diagram in a free software package like LTSpice. See link below. http://www.linear.com/designtools/software/#LTspice Your circuit should look something like this.
  20. Arouse1973

    Circuit help

    Hello Sounds like you have your transistor back to front. I am assuming it's an N-Channel MOSFET? In which case the source should be grounded. But with out a circuit diagram I can't see what you have done. Thanks Adam
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