<@U2PUXG69E> <@U9UB64E0N> re: our convo on the way to the MRT <https://hackmd.io/txrNRnNVSW-jI0kFH_udXg?view>
Do either of you have advice on how to move quickly with ordering a small batch of these circuit boards? - <@U2PUXG69E> did you say that you could pay and/or expense the cost to PDIS? - Can anyone help guide us toward a circuit board vendor and getting a quote? (my research reveals that it's a very confusing choice without a guiding hand!)
I can buy few out of my pocket, vendor needed though
First off, thank you so so much for making this repo public and keeping it up-to-date. I&#39;ve had such energizing conversations with people about working with the artifacts of your project. :heart: Co...
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:bar_chart: :heavy_check_mark: the participation view (viz and voting) - pol-is/polisClientParticipation
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:milky_way: AI powered surveying tool for open ended feedback and participatory democracy - Polis
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Structured Dialogic Design (SDD) is the dialogue and decision-making methodology used by the Institute for 21st Century Agoras and others in their 'co-laboratories of democracy.' Laborato…
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Hi again @OrenLederman! A few of us have been talking and meeting to work on this. (We keep notes fwiw) We came across some websites that we were hoping to use so that it&#39;s simpler for the next...
PCBShopper is a price comparison site for printed circuit boards. Enter your PCB's specs and immediately see prices from more than 20 PCB manufacturers.
If you are lucky enough to encounter a piece of homebrew electronics from the 1950s, the chances are that under the covers the components will be assembled on solder tags, each component with long leads, and chassis-mounted sockets for tubes. Easy to assemble with the most agricultural of soldering irons. Open up a home build from the 1960s or early 1970s, and you might find the same passive components alongside germanium transistors mounted through holes in a curious widely spaced stripboard or even a home-made PCB with chunky wide tracks. Solder tags aplenty in a commercial transmitter from the early 1960s Cutting-edge 1970s homebrew By the late 1970s and early 1980s you would find a more familiar sight. Dual-in-line ICs through-hole on 0.1″ spaced stripboard, and home-made PCBs starting to appear on fibreglass board. Easy to use, easy to solder. Familiar. Safe. Exactly what you’ll see on your breadboard nearly forty years later, and still what you’ll see from a lot of kit manufacturers. Nice and familiar, a through-hole Nicholas Zambetti CC BY-SA 3.0But we all know that progress in the world of electronic components has not stood still. Surface-mount components have a history going back to the 1960s, and started to appear in consumer equipment from the end of the 1980s. More components per square inch, smaller, cheaper devices. Nowadays they are ubiquitous, and increasingly these new components are not offered in through-hole versions. Not a problem if your experiments are limited to the 741 and the 555, but something that rather cramps your style if your tastes extend to novel sensors for a microcontroller, or RF work. This development has elicited a range of reactions. Many people have embraced the newer medium with pleasure, and the project pages are full of really clever SMD projects as a result. But a significant number have not been able to make the jump to SMD, maybe they are put off by the smaller size of SMD components, the special tools they might require, or even the new skills they’d have to learn. When you sell a kit with SMD components these are the reactions you will hear from people who like the kit but wish it was available in through-hole, so this article is for them. To demystify working with SMDs, and to demonstrate that SMD work should be within the grasp of almost anyone who can wield a soldering iron. But They’re So Tiny! Tiny SMDs – fortunately most of which you will not have to worry ’s likely to be the first reaction from a lifelong through-hole solderer. SMD parts are often very small indeed, and even those with larger packages can have leads that seem as numerous and thin as the hairs on a cat when seen with the rabbit-in-the-headlights panic of the uninitiated. But it is important to take a step back and understand that not all SMDs are created equal. Some of them are grain-of-sand tiny and only hand-solderable by those with God-like powers, but plenty of devices are available in SMD packages large enough for mere mortals. So don’t worry when you look at a board covered with grain-of-dust-sized components. Very few people could attempt that level of construction, your scribe certainly can’t. (We await commenters claiming to routinely hand-solder thousand-pin BGAs and 01005 chip components with anticipation, however such claims are useless without proof.) Instead, concentrate on the SMD packages you can handle. SMD chip component packages are refered to by a number that relates to their dimension. Confusingly there are both metric and imperial versions of the scheme, but the format is the same: length followed by width. Consider the picture above with the PCB and the tape measure, it’s the underside of a Raspberry Pi model B+, and will have been assembled by a robotic pick-and-place machine. The majority of the components are very tiny indeed, but you will notice L3 as the black component towards the bottom left that looks huge compared to its neighbours. That package is a “1008”, 0.1 inches long by 0.08 inches wide. It’s still tiny, but imagine picking it up with a pair of tweezers under a magnifying glass. Not so bad, is it. You’ve probably handled plenty of things in that size range before, do SMD parts seem so scary now? The larger components – 0805, 1008, and 1206 – are surprisingly within the grasp of the average maker. But I need all sorts of special tools! Retro Populator, a homebrew pick-and-place machine we featured back in 2014In a commercial environment an SMD device will be assembled by machine. Glue or solder paste will be printed in the relevant parts of the board, and a robotic pick-and-place machine will retrieve components from their tape packaging and automatically place them in their correct orientations. The board will then be soldered all-at once, either in a reflow oven or by a wave soldering machine. If you’re new to SMDs you are unlikely to have any of this kit just lying around on your bench. There are self-built pick-and-place machines and a host of self-built reflow ovens, but it’s safe to say they’re still quite an advanced thing to have. You’ll also see all manner of commercial kit aimed at the bench-top SMD constructor. Hot air soldering stations or SMD bits for conventional irons, all of which are very useful but come with a hefty price tag. The good news is that you don’t need any of these special tools to dip your toe into the SMD water. You almost certainly already have everything you need, and if you don’t then very little of what you lack is specifically for SMD work. If you have the following items then you are good to go: A basic SMD soldering toolkitA good light source. Even the larger SMDs are still pretty small. Plenty of light ensures you will be able to see them clearly. A good downward pointing desk lamp should suffice. A clear high-contrast surface. Because SMDs can be difficult to see, it helps if they are manipulated over a bright white surface. A fresh sheet of white printer paper on a desk makes a suitable working area. Good hands-free magnification. Unless you are fortunate enough to have amazing eyesight, you will need a decent magnifier to work with surface-mount components. The “Helping hands” type on a stand are suitable. A very small flat-blade screwdriver. You will need this to hold surface-mount components down while you solder them. A good-quality set of precision metal tweezers. You will need these for picking up, manipulating, and turning over surface-mount devices. A fine-tipped soldering iron. If you have a standard fine tipped iron suitable for use with conventional 0.1” pitch through-hole components then you should be well-equipped. That said there is one special tool that might be worth your consideration. Holding an SMD device while soldering it can sometimes seem like a task that needs three hands, so one or two tools can be found to help. Fortunately this is something you can build yourself. Take a look at the SMD Beak, a weighted arm for example, or your scribe’s spring clamp third hand. I’m sorry, this is just beyond my soldering skill level Desolder braid and plenty of flux are your is easy to imagine when you are looking at an SMD integrated circuit that its pins are just too small and too close together, you couldn’t possibly solder them by hand. The answer is that of course you can, you simply need to view how you solder them in a different way. With a through-hole IC you solder each 0.1″ pitch pin individually. It is something of a disaster if you manage to put a solder bridge between two pins, and you race for your desolder pump or braid. With a surface-mount IC by comparison there is little chance that you as a mere mortal could sol…
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[ :grants: 順便預告] g0v grant 2019 將在 `十二月上旬` 開始投稿，截止應該是一月上旬。新的細則還在修訂，過陣子會請社群 open review。
The social Fabric of Cities
The Social Fabric of Cities puts together an approach to cities and how they are part of social life – in fact, a tripartite approach to cities […]