Equalizer circuit composed of integrated operational amplifier TL084 (b)

It is a ten-band equalizer circuit composed of TL084. Its principle and structure are basically the same as Figure 4-35 (a).
It consists of 10 operational amplifiers and 10 simulated inductors, which respectively resonate at ten center frequencies: 32Hz. 64 ratio, 125№,
250Hz., 500 ratio, lkH2: 2kHz, 4kHz, 8kHz.16kHz. Island I is their common amplifier. This circuit
is also equipped with a multi-function input preamplifier. Different audio source signals are input through the selector switch SAL.
The RIAA phono balanced input amplifier is composed of 1458 and so on. . The transistor VTi is used as the microphone input amplifier, and the volume potentiometer
RPz controls the input to the main amplifier. The Iclo line, phono player, ∞ and radio are controlled
by the volume potentiometer RPi with equal loudness control . The circuit is also equipped with a pass-through switch SA3. For input signals that do not require equalization, SA3 can be moved to the pass-through position and output directly.