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Recent content by ianholmes

  1. ianholmes

    Calculate induced/coupled voltage in a wire

    Thanks Logbook. I guess I'll build it then! The application is a loadcell amplifier that needs to operate with a wide range of sampling periods from the sub hertz to the 10 hz region (i.e. this is the time available to get the data from the loadcell). The problems here are long term stability...
  2. ianholmes

    Calculate induced/coupled voltage in a wire

    Thanks Warpspeed. I'm looking at 100kHz through 1GHz. You're right about the costs of extenal testing! We do emissions on site but don't have amplifier for immunity, we usually hire a bunch or handhelds and wave them about. I was hoping to do some cigarette packet maths assuming a far field...
  3. ianholmes

    Circuit Design/Simulation Software Recomendations

    Go for SIMetrix it's dead easy to use and very powerful. We even bought the whole thing! Great help from them too when you get stuck.
  4. ianholmes

    Calculate induced/coupled voltage in a wire

    I am trying to work out the filtering requirements for some inputs to an Instrumentation Amp design to stop nasty RF getting up it. I would like to be able to calculate the magnitude of the induced voltage and current based on the impedance of the amp and the length of the cable connecting it to...
  5. ianholmes

    User-friendly cost-effective 3-d modeling software

    Look at turbocad professional. You can export to VRML and then anyone with a web browser can see a rotatable 3D model. It is very cost effective at under 200GBP at entry level.
  6. ianholmes

    High-Res. Ink jet printers

    I'm a designer at a WPL/checkweigher company and we do label applicators/chemithermal and thermal transfer printing at upto 200 packs/minute and 300DPI. I am wondering about developing an inkjet based direct to pack printer and wondered what people's experiences are with these types of head...
  7. ianholmes

    Fast Stepper Motor Drivers

    Any one know of any good high voltage stepper drive chipsets in the 80 to 100V range?

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