Micro soldering iron 12 volts. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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For soldering parts in micro-earphones, hand-held electronic watches, as well as the conclusions of microcircuits, varicaps and other miniature elements that modern radio electronics do not skimp on, I recommend getting a convenient micro-soldering iron. Its design is so simple, and the materials and equipment used in the manufacture are affordable, that even a schoolboy can make one for himself in a home workshop. And to power the homemade product from a household power supply, use a ready-made 220/12 V step-down transformer (the secondary winding should give 12 A to a 1-ohm load). As the latter, for example, TVK-110L from a frame scan of tube TVs (such as "Spring-308", "Record-V300" and similar, long-aged equipment) is quite suitable.

Twelve-volt "Krokha" for soldering micro-details: 1 - copper tip, 2 - copper foil base tube, 3 - insulator layers, 4 - twelve-ohm nichrome electric heater, 5 - metal cap-lock, 6 - tin casing, 7 - heat-resistant plastic handle . 8 - power cord, 4 - plug.

The tip of the soldering iron is a suitably processed 30 mm piece of copper wire with a diameter of 1,5 mm, which is inserted inside a homemade heating element. Although the design of the latter is also not complicated, it seems that it would not be superfluous to use a number of technological tips for its implementation.

Take, for example, the first stage of work - the manufacture of the base tube of the heating element, rolled up from copper foil, followed by coating it with a thin layer of a special electrical insulating mass (talc mixed on "liquid" glass - silicate office glue - to the consistency of a thick dough) and drying over an electric or gas burner at a temperature of 100 ... 150 ° C. The raw mass that has to be dealt with here is highly sticky. And in order to protect fingers from this, it is recommended to sprinkle them with dry talc from time to time (as, indeed, auxiliary boards or plywood used by the most resourceful of craftsmen to form the electrical insulating layer itself).

The second stage of work includes winding a heating coil from a 350-mm piece of nichrome wire with a diameter of 0,2 mm, applying a protective coating (for which the same electrically insulating dough-like mass is used) and drying according to the above technology (until the resulting semi-finished product is completely "sintered") ). When winding, it should be remembered that the turns here are stacked in one layer, tightly to each other, but leaving straightened ends-pins: the first one is 30 mm long, the second, the "bar" - 60 mm.

At the third stage (and this is the "wrapping" of a long lead with the application of the third layer of electrical insulating "test", another drying at a temperature of 100 ... 150 ° C and placing the resulting part in a protective casing made of tin) requires special care. The ends of the wire coming out of the self-made heating element must be covered again with a raw electrical insulating mass, followed by curing-sintering, leaving 10 ... 15 mm leads free (for connecting to an electrical cord in heat-resistant insulation). Often after this, additional stuffing with "dough" (and corresponding drying over the included electric or gas burner) of microcavities, formed due to insufficient accuracy, is required.

The final, fourth stage is no less responsible. The features of the technological process itself are such that first, through the hole in the handle, it is necessary to thread the cores of the electrical cord in heat-resistant insulation and screw the ends of our nichrome heater to them. After the necessary electrical connections are made with due care and the bare "splices" of the future electrical circuit are insulated, the heating element is "packed" in a tin casing and tightly, without distortions, is installed on the seat intended for it.

Control inclusion, warming up - and the electric soldering iron can be safely used. With proper operation, this homemade "Baby" will never let you down. After all, it was made according to a technology that has proven itself in practice from simple and reliable materials.

Author: A.Naumov, Chapaevsk, Samara region

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