The Simplest TS100 Upgrade Leads Down A Cable Testing Rabbit Hole

By now, I must have had my Miniware TS100 soldering iron for nearly three years. It redefined what could be expected from the decent end of the budget soldering iron spectrum when it came on the market, and it’s still the one to beat even after those years. Small, lightweight, powerful, and hackable, it has even spawned direct imitations.

If the TS100 has a fault, it comes not from the iron itself but from its cable. A high-grade iron will have an extra-flexible PVC or silicone cable, but the TS100 does not have a cable of its own. Instead it relies on whatever cable comes on its power supply, which is frequently a laptop unit built with portable computing rather than soldering in mind. So to use it is to be constantly battling against its noticable lack of flexibility, a minor worry but one that I find irksome. I determined to find a solution, making a DC extension cable more flexible than that on my power supply.

Unexpectedly Spawning A Product

The TS100 has a standard DC barrel jack, but surprisingly it’s rather an unusual one. It requires an extraordinarily long reach of about 15mm, and the plugs on some laptop supplies won’t mate with it satisfactorily. For my cable I would have to find the longest plug I could, and it turned out that there are surprisingly few on the market. Lumberg do one, but it tops out at too low a current rating for a soldering iron so I was rather stumped.

I approached Toby Components, my go-to supplier for connectors who have helped me secure unobtanium in the past, to see whether they had any better options. And that was where this saga took an unexpected turn. They didn’t have any off-the-shelf connectors, but they could get their cable people to make up a custom extension using an extra-flexible PVC cable. I parted with some cash, and duly received a package containing a couple of their prototypes. My build-a-cable project abruptly turned into a product test.

The first thing I did was plug it in and do some soldering, at which it was fine, and noticeably more flexible than the stock cable on my PSU. But merely saying that doesn’t give much information, I need some means of quantifying the flexibility of a cable. We can all tell by feel that one cable is more or less flexible than another. Holding it in our hands, the less flexible cable requires more force to bend it than the flexible one. Researching standard tests for cables reveals a surprise, they have a focus on safety and stress performance rather than its static physical properties, so while there are a host of fascinating tests to ensure that they don’t fail under repeated flexing or when being pinched, the standards don’t seem to include a simple measure of flexibility. It deserved some thought, so I considered and rejected measuring the droop angle of a set length of cable under its own weight, wondered whether a test rig could be set up in which a horizontal cable could have weights attached to it, and finally arrived at something much simpler.

How Do You Characterise Cable Flexibility?

My rough-and-ready minumum natural bend radius test rig.
My rough-and-ready minimum natural bend radius test rig.

If you take a piece of cable and hold it between your hands, it forms a line with 180 degree angle. Should you now bend it, it won’t form a point as it takes a narrower angle, instead it will curve and tend towards a circular outline. You’ll find there is a natural minimum bend radius it will comfortably take, at which it forms the circular outline and readily returns to straightness, yet is not bent to the extent that it kinks. So measuring the natural minimum bend radius of a cable is a straightforward and easily-reproducible test that can allow comparison of cable flexibilities.

My bend radius rig is simple enough, a flat piece of wood with another slim piece of wood held above its edge using a pair of screws. The cable is bent at 180 degrees back upon itself to form a loop of its minimum natural radius, then it is clamped between the two pieces of wood, thus the diameter can be easily measured and the radius calculated. I’ve added a piece of graph paper on top of my wooden base so that I can easily judge measurements, however I found my caliper to be the most convenient way to take them. As well as the two TS100 cables I’ve measured a few others from around my bench for comparison.

Cable Diameter Radius
Toby TS100 extension cable 20mm 10mm
TS100 laptop-style PSU cable 33mm 16.5mm
“Grundlagen Audio” gold USB cable 29mm 14.5mm
Multimeter test lead 16mm 8mm
IEC computer mains lead 48mm 24mm

It can straight away be seen that this is a readily reproducible way to characterise the flexibility of a piece of cable. At the extremes are the multimeter lead and the computer mains lead, no surprise as the former is designed to be as flexible as possible while the latter is a thick and heavy mains lead. That’s a cheap multimeter, it’s likely that had I been less miserly and bought a decent one it would have a significantly more flexible set of leads. The fake “Grundlagen Audio” USB lead from my April 1st sojourn into using GNU Radio for audio analysis meanwhile is surprisingly stiff for what was in reality a cheap Amazon Basics item. This is probably due to two factors; it has a braided outer in a bid to copy more expensive leads, and my spraying it with gold paint has only made it stiffer.

To the point of the test though, the TS100 cables. The Toby cable is under two-thirds the stiffness of the laptop-style power supply cable, which does make a significant difference to the ease of soldering. I didn’t expect to spawn a product when I asked them about connector availability, but if you’d like one they have it for sale on their website. And meanwhile, Hackaday now has another test in its armoury, measuring the bend radius whenever we take a look at a cable.

49 thoughts on “The Simplest TS100 Upgrade Leads Down A Cable Testing Rabbit Hole

  1. You can get silicone flex cables. They are extremely flexible as they use much finer wires inside. The added bonus of being able to handle high temperatures e.g. accidentally contact with your soldering iron.

  2. Great story! Since I started carrying a large USB-C battery/jump start pack around so I’ve switched to the TS80. It came with a silicone cable that is amazingly fexy and passes the eevbolg “with the iron melt its own cable?” test with flying colors! My TS100 moved into my quadcopter bag and hasn’t been used since :'(

    1. I keep different irons with different bits. TS100 for fine soldering, Antex with big spade bit for heavy stuff. And the TS100 knock-off as my mobile tool bag iron.

    2. Having used both do you find any meaningful difference in use? I’d have thought the TS80 was more annoying in use because of its connector comparatively – but that could just be my bias as I like barrel jacks – durable, rotatable and easy to replace if they do get damaged…

      Heard lots of good things about both, but not knowingly from somebody that has used both. Though I can see why the TS80 would be your choice if you have the battery bank etc is it actually a nicer iron as well – for me best in use matters most as I don’t have any portable power connector compatibilities to worry about (yet at least – all my stuff has a different end on, and its not worth the effort and cost to fix that yet).

        1. I’ll mention it, but I’d have to advise you not to get your hopes up. It’s possible that the mug people will be at MCH next year if you’re going to be there.

  3. Mine came with a nicely flexible silicone cable ending in a XT60 connector for use with lipo batteries.

    I just chopped off the barrel jack off the PSU cable and replaced with a XT60 connector so I can always use this much nicer silicone cable.

  4. There was one check I’d like to see and it would be heat dissipation. The higher the wattage usually the higher the heat on the power cord. I know …UL… safety but it’s also about keeping costs down. Some manufacturer’s may skimp or cut corners. Thanks.

    1. The cable was built to my spec for a supplier in Banbury, not to a penny-pinching spec for a mass-market auction house. So in this case, no, but I didn’t really need to. It certainly didn’t get warm.

  5. I’ve read this a couple times and I think it says “pull on the cable some” and measure the bend radius. Am I missing some quantitative measure of how hard to pull on the wire?

      1. Fair enough, but that still seems pretty wide open for inconsistent results depending on (at least) human performance and temperature.

        Perhaps the same measure the loop idea, but with the free ends of the wire pulled down with a known force and the wire guided between rollers? I’d suspect the roller dimensions and spacing would depend on the cable dimensions …

        1. All you have to do is loop an established length and zip tie it then measure the distance between the two sides. Should be highly repeatable and give good results.

  6. The ‘Type’ tests for cable assemblies are clearly specified in the various ANSI and IEC standards that would be scoped.

    ” “Bend it until it won’t naturally bend any further without forcing it and it kinking”. ” is not found in any of the approximately 871 IEC/ISO/ANSI standards sitting on my shelf that could be scoped for electrical equipment.

    1. Strangely enough I looked at all of those tests, and they’re not what I was looking for. They’re all about safety, so “How many times can I flex it without it breaking”. I wanted “How bendy is it” which is a different question entirely.

  7. The price is right and the have guest checkout so the have a new client ! Unless…

    Shipping only with DHL which cost almost 3 time more that the item…

    Too bad how shipping can be a dealbreaker…

  8. Seems silly to abide such an inconvenient and non-standard connector on a soldering iron… implying that you work with electronics anyway. Just bypass it. I would never be spending this much time and money accommodating somebody else’s engineering mistake. I’d probably just solder a lamp cable straight to the board, and when that wears out I’d solder another one.

    1. detachable cable makes for a much easier to pack setup, so I’d not solder a wire onto it myself unless it has become a desk soldering iron and never ever moves.. Which doesn’t really seem to be the market for these things anyway..

      Seems like this cable is the easier out than modifying the iron with a ‘standard’ connector – also I expect its that long for good reason – to spread the load of the cable over a greater area which will reduce the likelihood of breaking the socket off the pcb.

  9. Does the JLI in the part number stand for JennyLIst?

    I’m using a generic DC5525 extension from Amazon that is advertised for CCTV cameras. It is thin and lightweight but I’ve no idea what the gauge of the wire is inside. It doesn’t get warm and the TS100 seems to be fine but YMMV.

  10. It’s weird to hear about some “extra long” DC5525 used in TS100, because mine actually requires an extra _short_ one: only about 9 mm long (instead of about 12 or 14). And what I see advertised specifically for TS100 on Aliexpress comes with a 9 mm long DC5525 (it’s easy to tell visually).

  11. I’m not talking about a cable, but about the DC5525 connector, which may be of different lengths: 9, 12, 14 mm (approx.). The article states the right DC5525 length for TS100 is 14 mm, but my TS100 accepts (requires) the shortest, 9 mm connector.

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