This circuit is half dozen Band Graphic Equaliser ,you can modify sound in low ,mid and high that circuit used IC 741 Op-Amp. With this circuit you can management and mix frequencies and tones as desired.Essentially, the circuit consists of an IC 741 whose gain at various freguencies is set by corresponding potentiometer setting.
The audiblefrequency spectrum is roofed in six steps: 50Hz, 160Hz, 500Hz, 1.6kHz, 5kHz, 16kHz. All potentiometers are of 100kΩ linear kind. The circuit provides adequate boost / cut for traditional use.
power provide for the circuit may be derived from the amplifier / preamplifier itself. The wide rangeof provide voltage (6V-20V) makes the circuit terribly versatile. Power consumption is negligible.
6 Graphic Equaliser Circuit 741 Op-Amp list Component
R1,R2,R3,R4,R5,R6 : 27kΩ C1: 100n C6: 300pF
R7: 470kΩ C2: 33n C7: 100uF/16V
R8: 330kΩ C3: 10n C8: 4.7uF/16V
R9: 100kΩ C4: 3.3n C9: 47uF/16V
R10: 4.7kΩ C5: 1n IC1: 741 Op amp
R11: 4.7kΩ
VR1,VR2,VR3,VR4,VR5,VR6: 100kΩ Linear Potentiometers
