Etching of printed circuit boards. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Etching of printed circuit boards. 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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I offer radio amateurs several ways to etch printed circuit boards.

1. In one liter of hot (about 80 ... 90 ° C) water dissolve eight tablespoons of table salt and four tablespoons of powdered copper sulphate.

2. When adding 2 ... 3 cups of ammonium nitrate per 1,5 ... 2 liters of electrolyte, it turns into a 15 ... 20% solution of nitric acid. For cooking, you can take an electrolyte that has already served its purpose, even blackened from an excess of lead dissolved in it. Before preparing the solution, it must be filtered through gauze folded several times. Then, if it is dark in color (from a used battery), let it settle for 7 ... 10 days. After that, pour into another bowl without shaking the sediment, and then add saltpeter to it, stirring it with a glass or wooden stick until completely dissolved in the electrolyte.

The solution can be used until it is completely saturated with copper, which can be determined by its color (the solution is changed after it acquires a bright blue color). As the solution is developed, nitrate can be added to it to speed up the etching process.

3. Galvanic etching.

a) A printed circuit board blank is connected to the pole of the current source, with a voltage of 25 ... 30 V. The minus of the current source is connected to a wire, on the end of which cotton wool soaked in a saturated aqueous solution of common salt (H20 NaCI) is wound.

b) A wire is soldered to the printed circuit board foil. The place of soldering is covered with nitro-lacquer. This wire is connected to the positive terminal "+" of the current source with a voltage of 4 ... 12 V. The negative terminal "-" of the source is connected to a metal vessel. Pour a saturated salt solution into a vessel. When adjusting the current and voltage, it is necessary to ensure that the temperature does not exceed 35 ... 40 ° C.

Author: E.Kovalev, Dzerzhinsk

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