SU105966A1 - Transformer for contactless sound volume control in electromusic instruments - Google Patents

Description

The subject matter of the invention is a transformer for contactless Compared with the loudness of sound in electromusical instruments, a change in the coupling between the coils, performed by not moving a part of the magnetic circuit carrying one of the coils, or inserting between the screen coils.

The use of the proposed transformer can eliminate the occurrence of distorting interference. This is achieved by the fact that the magnetic circuit is formed by two annular heart-shaped stones with an air gap, but a lot of magnetic heads.

On fng. 1 shows a schematic representation of a proposed transformer with a non-expandable magnet core; in fig. 2 and 3 transformer, into the air gap of the ring cores of which a screen is inserted (in two versions).

A transformer for contactless control of the loudness of a sound has a magnetic conductor formed by two annular cores 1 n 2 with an air gap, a depth of magnetic heads.

The volume of the sound is controlled by changing the connection between the cores / and 2. This change of communication is done by moving a part of the magnet carrying core 2 or introducing between the cores of the screen.

In the first case (Fig. 1), the core 2 of the molset will move along with the key 4, which will cut off the loudest sound at the full press on claving. The smallest connection is obtained by a single key, which corresponds to the largest distance between the ring-shaped cores 1 and 2.

In the second case (Fig. 2), both cores 1 and 2 are fixed non-moving, and between them a screen 3 is inserted, moving together with the key 4. The dynamic range of both transformers is almost the same and equal to 50-55 decibels.

The best result is achieved if the core 2 and the screen of the two heads together with the key 4 (fig 3). The dynamic range of such a transformer exceeds 80 decibels.

Subject invention

A transformer for contactless loudness control of sound in electromusical instruments by changing the connection between the coils, performed by not moving a part of the magnetic circuit carrying one of the coils, or introducing a screen between them, in order to prevent distortion interference, the magnetic conductor is formed by two ring-shaped cores with an air gap, but a tina of magnetic heads.

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Entry

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Output

FIG. 2