Soldering iron videos

I have earlier posted about soldering irons. Here is a continuation to it with a set of interesting soldering iron tear-down and DIY videos from YouTube.

Inside the cheapest soldering iron on ebay.

How To Make a MINI USB Power Soldering Iron

Hot! Hot! Hot! Weller ROBUST Soldering Gun, BEB #21

Homemade Soldering Gun

How To make Powerful Soldering Gun




  1. Tomi Engdahl says:

    Is It A MagLite Or A MagnaStat?

    David Schneider]’s love affair with Weller temperature controlled soldering irons began many years ago, but when he came to the point of needing a cordless iron he had problems finding one that replicated his trusty mains-powered soldering station. His solution was simple, to build his own, and in a stroke of genius he did so with an odd combination of a Weller MagnaStat element and bit, and a repurposed MagLite flashlight.

    Want a Temperature-Controlled Cordless Soldering Iron? Here’s How to Make One

    You can’t buy one, but you can build a DIY one for tinkering in the field

  2. Tomi Engdahl says:

    EEVblog #1064 – Soldering Irons OLD vs NEW

    What are the differences between the “old” style soldering iron tips like used on the low cost Hakko and Weller low cost irons, and the more expensive integrated tip type?
    An apples to oranges comparison of the Hakko FX-888D and the JBC CD-2B stations.

  3. Tomi Engdahl says:

    EEVblog #1065 – Soldering Iron Power Delivery Explained

    the differences between applied power, tip design, sensor design, control loop design, and power delivery to a ground plane.

  4. Tomi Engdahl says:

    EEVblog #1152 – 240V-120V = Magic Smoke!

    Dave’s 120V Weller WE1010 released the magic smoke when plugged into 240V…
    PEBKAC for sure, but a potentially dangerous design flaw too?


    Does anyone know the exact legal regulations on non fused transformer primaries in various countries?

    Eu: all mains products have to be primary fused. However chinese products offen are findable

    UK consumer electronics regulation 374628/8467-6 subsection 6c paragraph II, clearly states ‘Don’t let that crazy Aussie bloke plug it in, it makes the pixies mad and you just know that sh*ts gonna happen!

    I dont believe it’s a regulation. From what I read, the over current protection is handled where the power comes in (circuit breakers). Only exception is when RMS voltages over 1000 are brought in.

    I’m not sure about the safety standards for soldering irons, but I do have quite some experience on EN60950 (safety standard for IT equipment), EN60065 (A/V equipment) and their common replacement, EN62368-. On all equipment which falls under these standards, a fuse on the AC mains is mandatory. Same for any medical device standards. I would be highly surprised if a non-fused transformer equiped device is allowed in any EU standard.

    For the UK, a fuse can be specified on the device for the plug, for countries with no fused plugs, eg Europe, then oh dear!!.

    This was totally caused by core saturation, turning the primary from an inductor to a resistor. It would be more expensive to have enough metal to tolerate a 2x overload.
    Hard to see how it can comply with safety standards to have a 10A capable input connector and no internal fusing. A primary short could potentially dissapate a kilowatt – this has to be a recall-level design flaw. Would be interesting to compare the 230V version.

    That product was never tested for use outside of North America, due to it only having a UL Listing for US & Canada (cULus graphic symbol) and no certification marks for any other country safety testing organizations (i.e. AUS, RCM, CE, etc). That product was evaluated by UL under File Number E18708 for Apex Tool Group (aka Weller Professional Tools Division) to the UL Category “KQLR” – Industrial and Laboratory Heaters, which uses UL Standard ANSI/UL499 and ANSI/NFPA 70 (aka National Electrical Code) to evaluate the product. This particular product category does not require additional fusing of the product primary power input, and relies entirely on the branch circuit power protection at the main power panel of the facility.

    Small mains transformers like this are designed to operate just starting to saturate even at proper voltage. You can observe this by monitoring the current waveform using an isolated scope probe across a low value resistor in series with the primary leads. The wave form gets “spikey” as you turn up the voltage closer to mains level. This is done to allow the minimum number of turns to keep copper losses down for better load regulation and to use the minimum amount of iron core material.


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