The rest can often be improvised in many ways using various microcontroller boards and voltage level converters etc that you'll probabably already have. Im my experience: If there's one thing that makes sense to stock at your own little lab - to avoid waiting 1-3 days for getting that little thing that blocks that project you want to complete - it's a wide assortment of connectors. They firmly entered my mental toolbox as a go to for a flexible circular connector when I don’t need to join existing physical interfaces like Ethernet or higher speed USB where the signal reliability is potentially worth just using a sealed socket with matching circular screw on connector, but for the sort of thing where I’d have made up a DB9 or DB25, I’m definitely going to be reaching for these again in future (I did get a few of them and used the solder cup versions to avoid needing the crimping tools and the associated extra costs) I wasn’t prepared to spend $50 Australian on a single pair of connectors for this project, especially since due to wiring limitations I’d have probably had to get two pairs. The standard absolutely has options for higher current but it comes with a smaller pool of available suppliers making those parts and thus they cost more. Yeah I probably could have explained a bit more, I did find connections that could do it but it was never quite right in terms of a size pin count or cost trade off for this specific project. One tool standard, lots of different high quality connectors! It sounds like a lot, but it's much less than the $800 American made tool and even less than the single purpose crimp hand tools for cheaper Molex and JST connectors. A Chinese company called JReady sells new crimp tools with the positioners for $300. You'll probably want the M22520/1-04 turret head. You'll also need a positioner to hold the crimp in the right position within the tool (these are interchangeable for a ton of different models). If you want to use the crimped versions, you'll want the M22520/1 basic tool or M22520/2 miniature tool for smaller wire gauges. There's also solder-cup versions of a lot of the connectors so that no crimp tools are required. The prices are high for new tools, but there's tons of surplus floating around thanks to government standards. Rugged, really high pin density, and impossible to insert wrong. There's a lot of surplus tooling on Ebay, and they're by far the best connectors I've ever used. I've been on a MIL-DTL-38999 journey over the last few weeks.
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