Hey Ankur!!! The Boss GE-7 Equalizer pedal adjusts the harmonic contents of an instrument in 7 separate bands ranging from 100Hz to 6.4kHz, with a boost/cut 15dB per band.

The additional Level control knob helps you to set a different volume for normal and effect sound (or to use the pedal only as a gain booster).

Here I am providing you Boss GE-7 Equalizer pedal schematic diagram



-Residual Noise Level: -100dBm (IHF-A Weighted, Typ.)

-Equalizer Control: +/- 15Db

-7 band EQ: 100Hz, 200Hz, 400Hz, 800Hz, 1.6kHz, 3.2kHz, 6.4kHz

-Level Control: +/- 15 dB

-Connectors: INPUT Jack, OUTPUT Jack, AC Adaptor Jack (DC 9V)

-Power Supply: DC 9V Dry Battery (6F22/9V), AC Adaptor

-Current Draw: 7mA (DC 9V)

-AC Adaptor: ACA-Series or PSA-Series (new models with silver label)

-Width: 70 mm

-Depth: 125 mm

-Height: 55 mm

-Weight: 450g


ICs, transistors and diodes used in the Boss GE-7 equalizer:

-IC1, IC2,IC3: TL022CP dual operational amplifiers

-IC4: uPC4558C dual operational amplifier

-IC5: HA1457W preamplifier

-Q1: 2SC732TM-GR NPN silicon transistor

-Q2, Q3: 2SC945-P NPN silicon transistor

-Q4, Q5: 2SK30ATM-Y N-channel JFET transistor

-D1, D2, D3: 1S2473 diodes

-D4: RD5.6EB3 500mW 5.6V Zener diode

-D5: 1OE2 diode