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Recent content by jophuds

  1. jophuds

    EMI radiation from cables

    Hi Guys, I have am trying to minimise the EMI radiation from cables carrying power to magnetic coils. I have read that shielded twisted pair cables with a drain wire where both the drain and the shield are connected to ground is the best approach - is this the case? What types of connectors...
  2. jophuds

    Slowing down MOSFET turn ON/OFF

    Thanks for the replies. To answer Skogsgurra's question: The voltages are up to 12V and the Current is up to 5A. Heat dissapation shouldn't be a problem as they intended usage would be for the MOSFET to turn ON over maybe 10-15ms, stay on for 5 seconds and then turn OFF over 10-15ms. As I said...
  3. jophuds

    Slowing down MOSFET turn ON/OFF

    Hi, I have a problem whereby I have a set of circuits for use with Helmholtz Coils that were initially designed to allow for rapid switching ON and OFF of the coils. The circuits are a High Side Power MOSFET and a H-Bridge configuration using Power MOSFETs. All the power MOSFETs are currently...
  4. jophuds

    Printer Port Opto Isolation

    Hi, I'm trying to use my printer port as a Digital Output Interface to a motor control IC. I want to use an opto-isolator circuit to protect my PC. However, the printer port outputs a 3.39 Volt High signal and a 0.1 Volt Low Signal - this is not enough to switch the opto-isolater by itself and...
  5. jophuds

    Electronics for Magnetic Field Generation

    Hi, I've been asked to develop the electronics for the following problem, -Provide a constant current to a coil that will generate a magnetic field. -Provide the ability to either stop or reverse the current in the coil - using a TTL or CMOS logic. I been looking around and I'm considering...
  6. jophuds

    Medical Phantom Project. 2D Grey Levels --> 3D Model

    Hi all, I'll quickly explain the project I'm working on and apologise for my lack of expierence in this area! I'm hoping to design a mammographic phantom for QA in a hospital. I've done some work already and I know what matieral I'm going to use and what depth of matieral I need to mimic a...
  7. jophuds

    spawn cl.exe error

    Hi, I'm getting the following error in the Visual C++ compiler. 'Error spawning cl.exe' Anyone know why this is happening ? Cheers joe
  8. jophuds

    Supression the initial current drawn by a motor

    jbartos, I am concerned about the use of a relay as the motor must be able to accelerate and have differenct velocities. My understanding of a relay indicates that it can only be on or off -- is this correct ?? If possible could you detail more about the use of an ampflier and state any...
  9. jophuds

    Supression the initial current drawn by a motor

    Thanks GusD, Can anyone recommend a site or a place where I can learn more about relays and the possibility of using them. Does anyone know if it is possible to build a circuit that will only involve the use of the relay when the motor is stopped and needs to be restarted ? Thanks in...
  10. jophuds

    Supression the initial current drawn by a motor

    electricpete and busbar -- thank you very much for your replies. My apologies for failing to mention it is a DC Motor ! Can either of you shed some light on choosing an appropriate capcitor value -- as this seems the most suitable solution given the situation I'm in. Thank You
  11. jophuds

    Supression the initial current drawn by a motor

    Hello, The situation I'm in is that I am using a Motor I/O Card to control two different motors. The card has two outputs to control the motors. The card is being used in conjunction with a PC104 card, which will control the motion of the motors through the Motor I/O Card. The problem I have...
  12. jophuds

    DC Motor Modeling

    Thanks for the reply robotboy, The spec sheet I had for the motor didn't provide the info, but I got a similiar motor with spec's I needed. The reason I am modelling it in simulink is that I am also trying to model a fuzzy control logic block, and since matlab has a nice little fuzzy logic...
  13. jophuds

    DC Motor Modeling

    Hi, I'm trying to model a DC Motor in simulink and I've got the expression I can't get certain values for this expression from the motor's datasheet. Haas anyone else modeled a DC Motor in simulink and if so how did they do it or has anyone any good info. or links on this kind of stuff. Thanks...
  14. jophuds

    Re: Can I place a axes on top of a frame in guide

    Hey, I'm new to the forum and I'm having a small problem with guide. I'm trying to design a fairly complex GUI with it and everything is okay but for some reason I cannot get any axes components to not be hidden behind frame components. I'm using frames just to group components and for...
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