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Recent content by sjm

  1. S

    need help on protel dxp 2004

    There seems to be an option to control this, but it doesn't work for me. In Fabrication Outputs, go to Final Artwork Prints, click Configure, right click on a layer, and choose Preferences. Here you can control the colors - there is a selection for background color, which by default is white...
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    How to print pcb files of protel dxp 2004?

    pcb printing files Here's the official explanation from Altium: Query: Why does an error message occur when I generate a 3D image of my PCB and then the 3D image appears and Protel crashes? Details: Design Explorer Information dialog appears: "Board boundary is incomplete - calculated...
  3. S

    gprs modem interface proceduer

    sim300 atmega8 schematic Sony Ericsson GR47 supports GSM, SMS, GPRS. We use it in our products. We pay around $US40 for it. Here's the datasheet:
  4. S

    Help me make surface mount resistors operate in 5V DC

    Re: Surface mount resistors Pretty much all SMD resistors will be capable of operating at 5VDC. Generally, you're looking at 50V operating voltage. However, the power rating is much more important. I've seen heaps of resistors burn out, not because the voltage was too high, but because it was...
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    [MOVED] PCB assembly service recommendations?

    Re: PCB assembly service recommendations? Where are you? It's hard to make recommendations without knowning where in the world you're based. We have a local supplier that does multi-layer PCB manufacture, sources parts, and assembles them. Including BGAs. Short run prototypes are typically in...
  6. S

    low current 10Ghz transmitter

    Have you looked at Hewlett Packard's range of microwave devices? I've attached a datasheet for a 10GHz oscillator FET that operates quite comfortably at 3V, 1mA. Drop this part into a standard ASK circuit, and you're done.
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    Problem with thickness/sub height ratio error in Designer

    Re: Designer Is this an etched board? Or is it something milled out of solid material then glued together? I assume the strip has a rectangular cross-section? 125mils is more like something you'd use for a busbar in a power supply than as a filter.
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    How to convert bmp file to PCB format for Protel?

    Re: convert picture to pcb Quote: AutoCAD would be my 1st choice. Import the .BMP into AutoCAD and export a .DXF file that you can import into the CAD tool as 2D-Lines. Then you can convert a closed polygon into copper (if you need to). You can use the "Scale" command to make different...

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