EEVblog #1158 - How To Create PCB Mod Boards

Comments · 263

• TH

  @TheRealLeeFox · 7 years ago

  Only five minutes in & we've got MELF on MELF action!  This is going to be good!

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• SH

  @shana_dmr · 7 years ago

  You managed to do whole video about this topic without using the word "bodge", I'm really impressed :D

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• JW

  @JWH3 · 7 years ago

  Call it what it is Dave. It's a bodge, plain and simple ;)

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• JA

  @jacksat2252 · 7 years ago

  Somebody had to sneeze in the reflow oven

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• MO

  @morgueaunne6552 · 7 years ago

  "Board" - the fine line between "Bodge" and "Mod"

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• UR

  @urdnal · 7 years ago

  Never mind mod boards, what&apos;s coming up in the old arcade game scene is custom ICs. Well, not <i>really</i> ICs. They&apos;re little boards that replicate the functionality of failed custom so-called hybrid chips. Usually SIP, &nbsp;ceramic substrate, always encapsulated. The two I&apos;ve got was a video DAC/buffer and the other did audio mixing for music and sound effects.<br>It was once thought that once these custom components are gone, that&apos;s it. Fortunately there&apos;s guys out making replacements.

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• ST

  @Stuartrusty · 7 years ago

  I know what you mean about repairs/replacements for military and defence. Also some backwards compatibility had to be part of the design of some sub-assemblies.<br>The company I worked for had to include (as part of the purchase agreement and contract) an assurance that we could repair, supply, maintain or replace everything down to component level for 10 years after date of installation. <br>Bodge wires and mod boards would be used regularly to overcome very real obselesence issues out in the field.

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• UP

  @UpcycleElectronics · 7 years ago

  Hey Dave(s) <br><a href="https://www.youtube.com/watch?v=jey8NmffhTo&amp;t=528">8:48</a><br>Upload referenced:<br><a href="https://www.youtube.com/watch?v=VXE_dh38HjU">https://youtu.be/VXE_dh38HjU</a><br><br>(And for good measure)<br>Dave&apos;s &quot;PCB Design &amp; Manufacture&quot; playlist:<br><a href="https://www.youtube.com/playlist?list=PL8D3B363139B67FF3">https://www.youtube.com/playlist?list=PL8D3B363139B67FF3</a>

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• NO

  @noakeswalker · 7 years ago (edited)

  In the UK electronics industry (HP), we used the terms &apos;kluge&apos; or &apos;kludge&apos; for an add-on mod like this. Wikipedia gives lots of possible sources for these words dating back even as far as WW1. If a mod is a bit &apos;kludgy&apos;, it generally means it&apos;s a bit of a bodge, but it works. The Scottish slang for toilet is &nbsp;&apos;cludgie&apos; :o) OTOH, a kluge pcb can be &nbsp;a valid way to a nice result, as with Dave&apos;s 121GW meter mod here, imho. Thumbs up !

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• PI

  @picklerick814 · 7 years ago

  how can one single human being have so much professional knowledge

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• PA

  @pauljmccain · 7 years ago

  I love these &quot;how to do it&quot; videos, Dave. One thing to note - some products such as wifi and bluetooth interfaces are designed from the start to be used like mod boards, placed down on your design from trays. Vendor gives pad layout for castellations, etc. I dont know how common it is, but we use one that way! We can use that mod board on a number of different designs, making changes to it independently of the main board.

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• KO

  @kostaskritsilas2681 · 7 years ago

  I used to work at Philips electronic in Montreal. We built PCs, and did our own board assembly. Being a high volume shop (~500K motherboards a year, and a similar quantity of VGA graphics card), the standing rule was that one mod wire would force a board re-spin. We would use up existing inventory of PCBs, and the next order would have the new artwork. Somebody internally did the math, and figured out that the manual labour to add a mod wire, and the bottlenecking of the production lines was always a higher cost than the re-spin cost.<br><br>Also, after about a year, MELF packages were banned. In our case, they were used for diodes and a few capacitors, and sue to their shape, gave the pick and place equipment (Fuji CP III and CP IV) a lot of problems, and they tended to roll off of their pads when moving down the conveyor line.

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