Refinement of 25AC-109. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Refinement of 25AC-109. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Audio equipment

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A simple refinement of the "25AC-109" acoustic system will significantly improve the quality of its sound. This will not require large expenses from the radio amateur and will not change the appearance of the speaker. It is only necessary to replace the long-obsolete 5GDV-1 head with a more modern 4GDV-1 and install a phase inverter.

First of all, it is necessary to remove the rear wall and the front panel of the speaker, remove the 5GDV-1 head from the case and paste over the inner surfaces of the side, top and rear walls of the speaker with foam rubber (felt or batting). After that, the separation filter should be modified in accordance with the one shown in Fig. 1 schematic diagram and, without connecting the high-frequency head, put the rear wall of the speaker cabinet in place.

Modification 25АС-109
Ris.1

Then proceed to the manufacture of the phase inverter tunnel. Since the exact calculation of its length is very complicated, it is proposed to choose it experimentally. To do this, a test tunnel is made from a sheet of drawing paper without a cutout for wires. Unlike the real one, its length should be equal to 25 cm. The test tunnel is inserted into the hole of the high-frequency head and, having applied a signal with a frequency of 30 ...

A real phase inverter tunnel is made of ebonite or cardboard with a cutout for wires (Fig. 2) and a length corresponding to the selected length of the trial tunnel. Then the back wall is removed, and the front panel is installed in place. Next, they take the head 4GDV-1, remove the fixing ring from it and glue it again with Moment glue to its original place.

Modification 25АС-109
Ris.2

After that, the head is glued to the grid of the high-frequency head strictly in the center of the corresponding hole in the front panel, where the 5GDV-1 high-frequency head previously stood. As a result, the 4GDV-1 head, the "25AS-109" grid, or rather the front panel itself form a single whole. Since the newly installed head is much smaller than the old one, gaps form around it, which are used in the phase inverter.

In conclusion, the 4GDV-1 head is connected to the separating filter, a tunnel is installed and glued to the front panel (Fig. 3).

Modification 25АС-109
Ris.3

Now it remains only to put the back wall in place - and the speaker is ready to go. You should pay attention to the observance of the polarity of connecting the heads (see Fig. 1), because the sound quality of the speakers also depends on this.

See other articles Section Audio equipment.

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