Loudly compensated volume control on a single-tap resistor. Encyclopedia of radio electronics and electrical engineering

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

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Loudness is usually implemented by frequency-dependent dividers (rarely filters) associated with the volume control. The fundamental drawback of most known regulators on variable resistors with taps is the insufficient degree of frequency response correction in the low-frequency region at low volume. For a better approximation to the curves of equal loudness, it is necessary to use variable resistors with several taps [1] or to implement a controller with a distributed frequency correction [2]. However, such control devices are very difficult to implement and therefore are rarely used.

The greatest application in both industrial and amateur designs was received by TRG on a resistor with one tap, the circuit of which is shown in the figure. The tap is usually made from 1/10 of the total resistance of the variable resistor (counting from the bottom according to the output circuit), which corresponds to approximately 1/4 ... 1/3 of the angle of rotation of the regulator engine. Connecting to the tap of the RC circuit turns the regulator into a frequency-dependent divider. The R1C1 circuit provides a rise in the frequency response at the highest frequencies of the audio range, and R2C2 - at the lowest. However, such regulators have significant drawbacks. So, the degree of frequency response correction provided by them in the low-frequency region is clearly insufficient (no more than 8 ... 10 dB at a frequency of 50 Hz), and in the process of adjustment, a stepwise correction is noticeable.

As the volume decreases after passing through the tap, the degree of correction no longer changes, whereas it should be maximum at low volume. Attempts to increase the degree of correction by reducing the resistance of the resistor R2 lead to the appearance of a characteristic dip in the frequency response at medium frequencies at the time of the tap. And yet, despite these shortcomings, many designers of AF amplifiers choose just such a TRG because of its simplicity. The ratings of the elements indicated in the figure are typical for most designs. Sometimes the resistor R1 may be missing. In this case, the capacitance of the capacitor C1 should be approximately two times less.

Literature

1. Ivanov A. Finely compensated volume control - Radio No. 12/1993 p.21
2. Zuev P. Volume control with distributed frequency correction - Radio No. 8/1986 p.49-51
3. Davydov M. Acoustic systems of broadcasting receivers - Radio No. 4 / 1956 pp. 52-54
4. Bozdeh J. Designing additional devices for tape recorders (1977, translated from Czech) - M. Energoizdat, 1981. pp. 174,188.

Author: A. Shikhatov; Publication: bluesmobile.com/shikhman

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