Stereo depth control. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Stereo depth control. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Tone, volume controls

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In a small room, it is not always possible to place the speakers at the required (2 - 3 m) distance from each other, so the stereo effect is weak. The described device makes it possible to electrically double the width of the stereo base and thereby improve the sound of stereo programs.

Stereo Depth Control

The device consists of two total difference converters of input signals, made on the OS A1 and A2. For its normal operation, the output impedance of the previous stage of the preamplifier must be low, and the voltage must not go beyond 200-2000 mV. The stereo width is adjusted by changing the ratio in the channels of the sum and difference signals using a dual variable resistor R1 R8. With a relative increase in the level of the total signal, the width of the stereobase decreases, while that of the difference signal increases. In the lower (according to the diagram) position of the sliders of the R1R8 resistors, the length of the stereo base is zero (monophonic sound), on average it corresponds to the actual distance between the speakers of the left and right channels, in the upper one it doubles.

The device gain is 5.

In the regulator, you can use a dual variable resistor of any type, but always of group A. The K140UD1B microcircuits can be replaced with other op amps with the appropriate frequency response correction circuits and supply voltages. The regulator does not require adjustment.

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