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4 Band Equalizer - Electronic Circuit Diagram

    https://circuitdiagram.net/4-band-equalizer.html
    The equalizer uses four pieces of variable resistor to cut and boost four range of audio frequency, that are: Low frequency: Freq. 35-680Hz; Medium frequency: Freq. 150-3kHz; Medium/semi high frequency: Freq. 450-8.5kHz; High audio frequency: Freq. 750-15kHz; Download 4 Band Equalizer circuit in PDF document from below link:

4 Band Equalizer Circuit » CircuitsZone.com

    https://circuitszone.com/4-band-equalizer-circuit/
    This 4 band equalizer circuit serves to improve the quality of audio before the input signal is amplified by an amplifier, especially in the term fidelity of audio. Equalizer circuit can also reduce unwanted audio frequencies, and amplifies the audio frequency desired. The equalizer circuit work at 12VDC symmetric. So that the resulting sound can be maximized, the …

Golden Age Project EQ-81 MKIII 4-Band Equalizer EQ81 4 ...

    https://reverb.com/item/47265844-golden-age-project-eq-81-mkiii-4-band-equalizer-eq81-4-band-parametric-eq-mk3
    This is a brand new Golden Age Project EQ-81 MKIII 4-Band Parametric Equalizer. Product Details: The class-AB equalizer circuit used in the EQ-81 MKII is similar to the eq section in the classic 1081 module, without the high and low pass filters. The sound character is …

Audio Equalizer Circuit using LA3600 - circuits-diy.com

    https://circuits-diy.com/audio-equalizer-circuit-using-la3600/
    This circuit has a 12-volt power supply. By using variable resistors, each band output can be varied (VR). You can split stereo audio or even equalize the audio with two LA3600 ICs. This circuit takes single audio. An audio input signal is separated into resistors and provided in the equalizer IC for separate base inputs.

Audio Graphic Equalizer Circuit

    https://www.circuitlib.com/index.php/schematics/product/49-audio-graphic-equalizer/category_pathway-28
    Below we present an Audio Graphic Equalizer circuit, based on Philips Semiconductors Application Note 142 (published on October 1984). The circuit itself has great performance and uses a top performance operational amplifier; the NE5532. The graphic-equalizer consists of an input buffer (IC1 -a), a variable-boost/ cut active filter (lC2-a), and an …

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