Try It Out

It’s like Star Wars versus Star Trek at a SciFi convention, or asking creamy or chunky at the National Peanut Butter Appreciation Festival. (OK, we made that one up.) When Jenny reviewed the 1.0 version of LibrePCB, it opened the floodgates. Only on Hackaday!

Of course it makes sense that in a community of hardware hackers, folks who are not unfamiliar with the fine art and engineering of designing their own PCBs, have their favorite tools. Let’s face it, all PCB design software is idiosyncratic, and takes some learning. But the more fluent you are with your tool of choice, the more effort you have invested in mastering it, leading to something like the sunk-cost phenomenon: because you’ve put so much into it, you can’t think of leaving it.

The beauty of open-source software tools is that there’s almost nothing, aside from your own psychology, stopping you from picking up another PCB program, kicking the proverbial tires with a simple design, and seeing how it works for you. That’s what Jenny did here, and what she’s encouraged me to do. Whether it’s beginner-friendly Fritzing (also recently in version 1.0), upstarts LibrePCB or Horizon EDA, heavyweight champion KiCAD, or the loose-knit conglomeration of tools in coralEDA, you have enough choices that something is going to fit your PCB hand like a glove.

I certainly wouldn’t risk a swap up to a new tool on something super complicated, or something with a tight deadline, but why not start up a fun project to test it out? Maybe follow Tom Nardi’s lead and make a Simple Add-on, for a badge or just as a blinky to put on your desk? Don’t be afraid to try something new!

A Guide To Milling PCBs At Home

If you keep up with various retro vacuum tube projects, you probably have run across [UsagiElectric] aka [David]’s various PCBs that he makes on his own Bridgeport EZ-Track 3-axis milling machine — massively oversized for the job, as he puts it. In a recent video, [David] walks us through the steps of making a sample PCB, introducing the various tools and procedures of his workflow. He points out that these are the tools he uses, but the overall process should be similar no matter what tools you use.

  • Logisim to validate logic designs
  • TINA-TI, Texas Instrument’s version of the TINA SPICE simulator
  • DesignSpark PCB for schematic entry and PCB layout
  • FlatCAM, a computer-aided PCB manufacturing tool

For this video, [David] makes a half-adder circuit out of four vacuum tubes plus a seven-segment VFD tube to show the combined sum and carry outputs. Momentary switches are used to generate the two addends. Using this example, he proceeds to design, simulate, build and demonstrate a working circuit board. We like his use of the machined pin socket inserts for building a vacuum tube socket directly into the board.

Now this process isn’t for everyone. First of all, a Bridgeport mill is a pretty good sized, and heavy, tool. That said, these procedures should adapt well to other milling machines and engravers. We should point out that [David] is making boards mostly for vacuum tubes, where circuit trace width and spacing distances are generous. If you’re planning to make home PCBs for a 273-pin PGA chip, this isn’t the technique for you.

It seems that the bulk of [David]’s vacuum tube PCBs are single-sided, and reasonably so. They use wire links here and there to jump over traces. Adapting this process to double-sided PCBs is doable, but more complex. Are you milling double-sided boards in your lab? If so, let us know about it in the comments below.

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