Combined volume and tone controls. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tone, volume controls
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The variable resistor R1 regulates the frequency response in the region of higher audio frequencies, R4 - in the region of the lower ones. In the upper position of the resistor R4 engine according to the scheme, the frequency response has a rise, and in the lower position - a blockage in the region of higher sound frequencies. When installed in the upper position of the resistor R4 engine, the frequency response has a rise in the lower audio frequencies. In the lower position of the slider of this resistor, the frequency response is horizontal. Resistors R3, R5, R6 perform the functions of volume, maximum volume and balance controls, respectively.
The nature of the frequency response correction and the range of regulation depend on the position of the volume control slider R3. In the upper (according to the diagram) position of its slider (maximum volume level), the frequency response will have the form shown in Fig. 2a. This volume level is taken as 0 dB. The frequency response at volume levels of -20 and -40 dB is shown in Fig. 2, respectively. 2b and XNUMXc.
The following ratios were used to calculate the ratings of the regulator elements: R1=R3=R4=R6=R, R5=5*R, R2=0,4*R, R7=0,2*R; C1(nF)=100/R(kΩ), C(nF)=10000/R(kΩ).
The calculated coefficients in the formulas are empirical and are advisory in nature. In the instance of the regulator implemented by the author, R is assumed to be 100 kOhm. The standard values of resistors and capacitors corresponding to this value can have deviations of up to 30%. For example, R1=R3=R4=R6=100 kΩ; R%=470 kΩ; R2=39...43 kOhm; R7=10...22 kOhm; 1=750...1200 pF; C2=0,1uF.
Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
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