No matter how much I measure before hand......

Discussion in 'General Electronics Chat' started by jerseyguy1996, Jul 9, 2011.

  1. jerseyguy1996

    Thread Starter Active Member

    Feb 2, 2008
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    This always happens......

    [​IMG]

    Just wanted to vent....
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    Just squeeze that 1N5821 in a vice a bit...

    That reminds me... I once saw that someone had tuned the value of a resistor by using a Dremel moto tool (or similar) and a small rotary sanding drum to take a "U"-shaped section out of the side of it...
     
  3. davis.jacobj

    New Member

    Jul 7, 2011
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    Do you use pcb layout software? Makes it so that doesnt happen. :)

    If you dont, get EAGLE. Www.cadsoft.de. Relatively low learning curve, i think.
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I once used a Dremel to change a 1N5821 to a 5082-2835.;):D
     
  5. Jaguarjoe

    Active Member

    Apr 7, 2010
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    I think that only works with carbon composition resistors. It's been a long time....
     
  6. #12

    Expert

    Nov 30, 2010
    16,257
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    LOL! Practice, practice, practice. You'll get better or learn to let the fat ones live half an inch off the board. ;)
     
  7. debjit625

    Well-Known Member

    Apr 17, 2010
    790
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    I know how it feels,just bad luck...
     
  8. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Actually, we've done that to increase the resistance of chromium coated tungsten rods used for vacuum deposition. Shaved the diameter to half over the length of the rod with a diamond burr. ;)

    Ken
     
  9. Markd77

    Senior Member

    Sep 7, 2009
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    Definitely not going to work with wire wound resistors...
     
  10. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    @jerseyguy: can you use a SMD diode on the back side? It might look a little cleaner if you can get a large enough package to span the thru holes.

    Wish I could say I'm immune to these things too. Just last week I found I had miswired a SOT-23 AGAIN! I seem to have a particular brand of mental defect I refer to as "transistor dyslexia," the complete inability to understand the simple spacial relationships between base, emitter and collector.

    In this case, I was laying out a previous working PCB design to a new form factor, same parts, different board shape. I "improved" the SOT footprint to the "standard" pin 1 2 & 3 configuration without checking my schematic symbol which was laid out to some random configuration, so the auto router and design rule checks thought all was fine. And since I had already made "this" board I shorted my manual checks.

    Fortunately I could spin the device and still get proper connectivity to ship my prototype.
     
  11. Wendy

    Moderator

    Mar 24, 2008
    20,765
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    I have a set of templates I call PaintCAD. I try to draw the components as close to real size as possible, Someone mentioned the PCB software, the same thing applies. I use Express PCB, but in this the exact software doesn't matter a lot, the feature is in all of them.

    Experience helps, but this is definitely a case of measure twice and cut once.

    Look at it this way, it fit. :D
     
  12. jerseyguy1996

    Thread Starter Active Member

    Feb 2, 2008
    206
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    I just shoved it in as far as it would go and soldered it on. I decided in the end that I didn't really care if it looked pretty or not.;)
     
  13. jerseyguy1996

    Thread Starter Active Member

    Feb 2, 2008
    206
    9
    I use expressPCB as well and had to draw the terminal block from scratch. I guess I read the dimensions wrong on the datasheet. But like you said.....it fit....just not very well.
     
  14. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    I'm not familiar with Eagle, I use Orcad's PCB Editor (Allegro), which has a "place bound" property, basically a keep-out area for other place bound shapes. Keeps from putting a part on a part IF you make the footprint correctly.

    If.

    I would be surprised if Eagle didn't have a similar feature.
     
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