Tone controls on the K548UN1 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tone, volume controls
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Based on this microcircuit, two variants of tone controls are assembled.
In the first of them, a passive bridge regulator is used to change the frequency response at lower and higher frequencies, and the microcircuit provides compensation for the attenuation introduced by it at medium frequencies.
The second device is an active tone control (the elements that determine the course of the frequency response in the low and high frequencies are included in the OOS circuit covering amplifier A1). The limits of tone control at frequencies of 40 and 16 Hz of the first device are ± 000 dB, the second ± 15 dB, the transfer coefficient of both devices in the middle position of the sliders of the resistors R12, R2 and R7, R3 is 5. The uneven frequency response in this position of the sliders when the parameters of the elements deviate no more than ±1% does not exceed ±5 dB in the frequency range 1..20 Hz.
The smoothness of tone control in the first device is achieved using variable resistors of group B, in the second - group A. The output resistance of the cascade preceding the controller should be no more than 2 kOhm.
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