The press - by means of an insulating tape. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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There are many ways to draw a pattern of conductors on a foil board. It is difficult to give preference to one of them. Some radio amateurs find it easier to paint conductors with nitro paint, others with photosensitive varnish. However, these methods are complex, time-consuming, require skill, additional devices, and sometimes scarce materials. You can simplify the process with electrical tape - a cheap, affordable material.
The printed circuit board is developed according to the technology recommended in the article by S. Biryukov "Development and manufacture of printed circuit boards" ("Radio", 1996, No. 9, pp. 38-40). After drilling holes for the leads of parts and fixing screws, the board foil is cleaned with fine sandpaper until the burrs disappear.
The next stage is the manufacture of strips of electrical tape, which will lay the future printed conductors. Insulating tape should be polyvinyl chloride (PVC), elastic, as thin as possible, without losing its adhesive properties. When using microcircuits with a pitch between pins of 2,5 mm and a diameter of holes for them on the board of 0,8 ... 1 mm, the optimal width of the strips should be within 1 ... 1,5 mm. Under the conclusions of other parts, the width of the strips should exceed the diameter of the holes by 0,2 ... 0,4 mm.
Strips are cut on a 150x30 mm plate of hard and smooth plastic. A piece of electrical tape is glued onto the plate without stretch, pressing it tightly with your fingers so that there are no bubbles. Using a metal ruler and a cutter (scalpel), cut off the first strip, remove it from the plate and stick it on the board according to the pattern of the printed conductor (Fig. 1).
The excess strip is cut off outside the conductor, holding the strip in this place with a finger. If the conductor is complex, the bend is made at a right angle, gluing the next strip (or the remainder of the previous one) at the bend, cutting it off at the end of the conductor. The laid strip is ironed with a finger for reliable gluing so that the solution does not leak under it during etching.
Subsequent strips are cut and glued to the board in the same way.
Parallel conductors are sealed with strips of electrical tape with a gap between them of 1 ... 1.5 mm. If you do not like the print pattern, the strip (or strips) can be removed and glued more successfully. The place where the strip lay is not cleaned.
If with other methods of manufacturing printed circuit boards, contact pads were made for microcircuit leads (Fig. 2, a), then in this embodiment, their role is played by the elongated ends of printed conductors (Fig. 2, b). As a result, the installation of microcircuits is simplified, since the distance between the lead wires is increased. The same picture is obtained when mounting other parts, say, resistors (Fig. 3).
The contact pads for the conclusions of large parts (oxide capacitors, relays, and others) are sealed with electrical tape in the form of rectangles and squares of various sizes (Fig. 2, c).
Before etching the board, make sure that all holes, except for the mounting holes, are securely covered with electrical tape, there are no gaps in the joints of the strips. In extreme cases, the gaps are closed by gluing additional pieces of tape 3 ... 4 mm long.
After etching, the board is washed with water, the electrical tape is removed, the board is dried, cleaned with fine-grained sandpaper and lubricated with an alcohol-rosin solution. The conductors of the board are covered with a thin layer of solder, after which the board is wiped with alcohol, solvent or acetone and cleaned with newsprint to a mirror shine of the conductors.
Author: Yu.Ivanov
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