Using conventional surface mount capacitors. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Using conventional surface mount capacitors. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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Those who are interested in amateur radio design or repair of consumer electronics increasingly have to deal with surface-mounted printed circuit boards. And here, in addition to purely technical tasks, there are often difficulties in acquiring the necessary components. Even in Moscow, it is not so easy to buy, for example, capacitors of the required ratings in small quantities.

Therefore, in case of difficulties in purchasing PM capacitors (PM - surface mounted), I manufacture them myself from the usual KM series. These capacitors differ from PM only in shape and somewhat larger dimensions, the presence of soldered wire leads and coating with a protective compound (usually green).

It would seem that the whole task comes down to tapping the conclusions. In fact, the way it is, only attempts to solder them without first removing the compound lead to the failure of the capacitor. This is explained by the fact that the capacitor plates are very thin and quickly dissolve in the solder, and the compound is very heat-resistant and requires too high a temperature and an excessively long time to destroy. Therefore, the leads are separated together with the conductive plates.

Attempts to mechanically remove the compound layer were unsuccessful. Destroying the protective compound turned out to be quite simple using a common tool for removing old paint from a car body. This tool (TU 6-00-00210051-025-96), manufactured by the Research Center "Khimprom" in Volgograd, can be bought in auto cosmetics stores.

Observing the precautions, according to the instructions for using the product, it is poured into a small dish (if it is plastic, make sure that it does not dissolve in this case) and the necessary capacitors are immersed there. They are kept in liquid for at least six hours, stirring the contents from time to time.

After that, take out one capacitor with tweezers, rinse it with cold water, pry off the compound layer with a knife blade and try to remove it. If it leaves with considerable effort, the exposure of the capacitors in the agent must be extended for another hour or two.

When the compound is completely removed from the capacitor, the leads are quickly soldered with a well-heated soldering iron. When mounting the capacitor on the board, you should use low-melting solder. The capacitor prepared in the described way survives 3-4 solderings without a noticeable deterioration in electrical and mechanical performance.

Author: O. Golubev, Moscow

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