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Type: Posts; User: marce

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  1. Closed: Re: Gerbers and drills offset from one another...cant view properly in GC prevue

    Set the default to bottom left of the design for both gerber and excellon, then it will also line up with the IPC-D-356 data if you use it.
    It is not a bug, Excellon2 data only contains the drill...
  2. Closed: Re: PIC16F1947 land pattern doesnt tell of solder resist "stencil"

    Use IPC-7351 rules, do solder mask same size as the pads, it can then me adjusted to fit the technology level of the PCB during manufacture, in some cases the over size can be zero for solder mask...
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    Closed: Re: I have a question about PCB recycling

    Nope, only the metal is recycled.
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    Closed: Re: Certificate Standard IPC

    Look for IPC CID courses in your area online.
  5. Closed: Re: Passing radiated EMC with an SMPS involves an element of luck...how much agree?

    I've done SMPS's in non metal cases that have passed EMC requirements, care and understanding of the beast is what you need, break it down into little bits and its easier, like all circuits, split it...
  6. Closed: Re: First attempt at USB differential pair routing on a 2 layer board. Acceptable or

    Nope you are providing a RETURN path for all your signals, never a waste, always a benefit...
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    Closed: Re: Thermal vias in pads..plated over

    On critical jobs I have the plating done thicker, 0.035-0.050mm plating in the via... Generally mil/aerospace jobs, cheaper than plating.
  8. Closed: Re: Speakers make a loud noise when turning off. Is there a way I can eliminate it?

    If you are turning off with a mains switch a 0.1uf cap across the switch can often solve the problem, its a common issue when mains is switched directly.
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    Closed: Re: Thermal vias in pads..plated over

    Don't fill them, its cheaper.
  10. Closed: Re: Ethernet vs USB discussion and/or comparison

    If you remove the packet overheads its not USB or Ethernet...Your reply is also a bit un-polite shall we say...
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    Closed: Re: COnductive vs Non-Conductive Power Connectors

    This is referring as siad to mil spec connectors, usually D38999 beasties, if your using them for a mil contract, then the finish will be specified, if not pick the one suitable for the design at...
  12. [SOLVED]Closed: Re: I need help understanding measurements / dimention markings on a datasheet

    Better still read the DXF into your cad package and use as a base for the component.
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    Closed: Re: Heatsink soldermask on PCB

    If we fit a heatsink we remove the solder resist even when using thermal pads, but generally just using the PCB we leave the solder mask on...
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    Closed: Re: Heatsink soldermask on PCB

    Have a read of this...
    http://www.ti.com/lit/an/snva183b/snva183b.pdf

    Done both ways...
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    Closed: Re: Fanout of 0.65mm BGA

    Start with filled via in pad...
    Outer rows fan out on mounted layer, inner rows fan out with a 0.1mm track/gap, suppress inner layer pads...
    This is always a useful tome to have handy......
  16. Closed: Re: Convert 20year old CADSTAR(?) .PCB File to Usable format

    Easier just to use cadstar...:grin:
    Data sorted...
  17. Closed: Re: Looking for pcb manufacturers for large boards (31"x17"x0.286" 40 layers)

    Will ask around, I know people who do mixing desks and have the same problem, once you go above their approved panel size your a bit goosed. Its not the PCB material but having the processing...
  18. Closed: Re: Convert 20year old CADSTAR(?) .PCB File to Usable format

    Can probably do it... email me.
  19. Closed: Re: Impedance calculation of traces with discontinuity

    Get a system with a proper signal integrity function and a 3D field solver...

    If you are getting discontinuities you are doing something wrong.

    The impedance is not the sum of the 3 sections,...
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    Closed: Re: Where are all the TFT/LCD fabs

    Its been going on for years, look at the history of IC fab houses, that did the same.
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    Closed: Re: Good PCB Layout Designers

    The most important skill a PCB designer learns from experience is component placement, that is the number one skill you need to do correct layouts.
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    Closed: Re: PCB design from circuit

    http://www.eas.uccs.edu/~mwickert/ece5250/notes/RFMicrowave-PCB-Design-and-Layout.pdf

    good info
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    Closed: Re: Impact of Via hole size

    Download Saturn PCB toolkit, there is a calculator for via parameters, so you can work them all out. Use the minimum plating value for your via, get this figure from IPC spec or PCB manufacturer......
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    Closed: Re: Where are all the TFT/LCD fabs

    I rarely ask them on this site, but do answer sometimes... but if you didn't ask the question then I and others would not answer them and the forum would die.
    After 35+ years in electronics I am...
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    Closed: Re: PCB design from circuit

    Saturn PCB toolkit is a good start...
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