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Type: Posts; User: marce

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  1. 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.
  3. 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.
  5. 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...
  7. [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......
  11. Closed: Re: Convert 20year old CADSTAR(?) .PCB File to Usable format

    Easier just to use cadstar...:grin:
    Data sorted...
  12. 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...
  13. Closed: Re: Convert 20year old CADSTAR(?) .PCB File to Usable format

    Can probably do it... email me.
  14. 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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    Closed: Re: Where are all the TFT/LCD fabs

    Cost....
    Your content sounds (reads) very similar to Treez's?
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    Closed: Re: Reverse ESD Discharge control

    Sometime you have to use plastic for the cases, plenty of electronics in un-shielded plastic cases that work and work even if there is a ESD incident...
    Layout is critical, the position of the...
  23. Closed: Re: Reworkign a PCB with a 0805 resistor or a MELF resistor?

    ! shouldn't matter if you use correct assembly techniques.
  24. Closed: Re: How to determine the number of vias on PCB?

    IPC-7093
    The device data sheet.
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    Closed: Re: DDR3 hardware circuit design

    Micron have data for layout.
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