This circuit is 6 Band Graphic Equaliser ,you can adjust sound in low ,mid and high which circuit used IC 741 Op-Amp.
Circuit diagram :
6 Band Graphic Equaliser Circuit with IC 741 Op-Amp
Audible Frequency spectrum is treated in six bands: 50Hz, 160Hz, 500Hz, 1.6kHz, 5kHz, 16kHz. All potentiometers are linear type of 100k. The circuit offers a lot of cut / boost for normal use.
Parts List :
R1, R2, R3, R4, R5, R6 27kΩ
R7 470kΩ
R8 330kΩ
R9 100kΩ
R10 4.7kΩ
R11 4.7kΩ
VR1, VR2, VR3, VR4, VR5, VR6 100kΩ
C1 100n (104)
C2 33n (333)
C3 10n (103)
C4 3.3n (332)
C5 1n (102)
C6 300pF (301)
C7 100µF 16V
C8 4.7µF 16V
C9 47µF 16V
IC1 741 Op amp
Power for the circuit of the amp / preamp itself derived. The wide range of power supply (6V-15V) makes the circuit very versatile. The power consumption is negligible.
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