Parametric tone control. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Parametric tone 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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Unlike traditional controllers that change the frequency response of the amplifying path at lower and higher frequencies, the parametric controller allows you to shift the frequency response of the frequency response in a fairly wide range. In terms of functionality, such a tone control approaches a multi-band one, but is much simpler than it.

Parametric tone control

The main parameters:

Rated input voltage, mV.......220
Output voltage, V rated ....... 1
maximum......7
Harmonic coefficient, %, no more.......0,07
Relative noise level, dB, no more.......-80
Tone control limits, dB.......±10
Frequency response bending frequency tuning range, Hz, in the frequency range: lower.......60...700
higher ....... 1 000 ... 8 000

The device consists of an AF amplifier made on two op amps of the A1 chip, an infra-low frequency filter R2C1 and two two-terminal devices with a frequency-dependent input impedance, each of which is made on a transistor (V1, V2) and one of the op amps of the A2 chip.

A high-pass filter (HPF) C5R11R12 is connected between the cascades of the first two-terminal network, and a low-pass filter (LPF) C8R17R19 is connected to the second. The cutoff frequencies of these filters can be smoothly changed by variable resistors R11 and R17.

The two-terminal inputs are connected to the engines of variable resistors R3 and R4, which perform the functions of the actual tone controls, respectively, at lower and higher frequencies. As a result, the amplification of the cascade at the op-amp A1.1, in the OOS circuit of which the resistors R3, R4 are included, depends not only on the position of the sliders of these resistors, but also on the frequency. When the sliders are set to the extreme left (according to the scheme), the frequency response at lower and higher frequencies has a maximum rise, to the extreme right - the maximum decline, in the middle position of the sliders the frequency response of the amplifier is horizontal. The frequencies from which the decline or rise in the frequency response begins are changed by variable resistors R11 and R17; a decrease in their resistances leads to a frequency shift to the higher frequency region, an increase to the lower frequency region.

To reduce interference with a frequency below 20 Hz, an infra-low frequency filter R1C2 is connected to the input of the bass amplifier (switch S1).

Any other op amp can be used in the device with appropriate frequency response correction circuits and supply voltage. Variable resistors R3, R4, R11, R17 - SPZ-ZZg or SPZ-ZZd.

Establishing the regulator comes down to setting the trimmer resistor R6 to the nominal output voltage (1 V) when a voltage of 220 mV with a frequency of 1 kHz is applied to the input (the sliders of the resistors R3, R4, R11, R17 should be in the middle position).

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