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  1. MagicSmoker

    Recommendations for contract board assembly needed.

    I'm looking to hear about experiences others here have had with contract PC board assembly (ie - solder paste printing, component placement, reflow soldering), particularly of relatively small production runs (say 100 of each board). We've been doing all of our pc board assembly in-house for the...
  2. MagicSmoker

    Drawing program for system-level wiring diagrams?

    I'm curious as to what other engineers are using to draw system-level schematics (as compared to board-level). Like, for example, multiple VFDs and motors supplied by a genset showing individual wires between each, but otherwise representing each device with a generic, geometric shape. More...
  3. MagicSmoker

    Estimating the source inductance of a 3ph. generator

    I'm working on a rectifier for a drive system that will be supplied by a 625KVA diesel genset. The existing rectifier being used has the usual 3% impedance line reactor as normally specified when a drive is supplied by the mains and this strikes me as both counterproductive (more voltage drop)...
  4. MagicSmoker

    board to board interconnect suggestions wanted

    For interconnecting multiple pc boards (both signal and power), I have typically used flat flex cable/connectors or ribbon cable/IDC connectors. I admit I have always been skeptical of the long term reliability of both interconnect systems and a new project I am starting on has placed...
  5. MagicSmoker

    BGA vs QFN in high vibration environment?

    Wanted to solicit the opinions of the eng-tips crowd on this. Got a software engineer friend who is writing the code for some doodad that controls/monitors an IC engine in some gadget (details obfuscated to protect the guilty). He asked me whether a QFN or BGA package of the chip would better...
  6. MagicSmoker

    Triple build wire vs. insulation tape?

    Is it possible for an SMPS transformer to make it through hipot/safety agency approval testing using triple build wire on all of the primary and secondary windings rather than the usual tape in between each winding? I could really cut down leakage inductance by multifilar winding the transformer...
  7. MagicSmoker

    Traction alternator field control

    Hey folks... I have a customer from the railway industry that wants to use one of my DC motor controllers to control the field current in a 1400hp traction alternator. On paper this looks kosher so it got me to wondering how much a real traction field controller costs. Say, something capable of...
  8. MagicSmoker

    EMC pre-compliance testing

    I'd like to be able to do some basic "pre-compliance" testing of high power dc motor drives in house. I'm a power electronics kind of guy, not a compliance engineer, but it looks like all I need to do basic far field (10m) testing is an antenna (preferably calibrated) and a spectrum analyzer...
  9. MagicSmoker

    Time for a new scope

    Well, folks, I've gotten by with my THS720 for many years now. It's been a fantastic scope - definitely one of the best-engineered products I have ever used - but it is definitely showing its age because more and more I find myself wishing for faster/better transient capture and math functions...
  10. MagicSmoker

    Sealed board-to-board interconnect system?

    What I would ideally like is a connector system that is sealed (IP65 or better) and has mating panel mount, through hole headers. Probably pushing my luck here (as if I haven't already), but I'd really like it if they are both vertical with respect to the PCB. Plenty of stuff for wire-to-board...
  11. MagicSmoker

    Help cleaning up a tach pulse

    Just looking to bounce some ideas off you all here. I'm a power electronics kind of guy so sometimes this digital stuff is a bit foreign to me, but, here goes... I want to clean up the pulses from a generic OC prox switch (could be optical, inductive, etc...) in the presence of incredible...
  12. MagicSmoker

    QC testing power film capacitors

    Greetings all - what a site! Assuming the tomatoes aren't launched my way in force I will probably be bouncing a bunch of ideas off you all as I have a few projects starting up in the next few weeks. But for now I'm looking for some ideas on ways to do incoming QC testing of large dc link...

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