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DIY Hobby projects, diagram, schematic

6 Band Graphic Equaliser Using 741 Op-Amp IC

electronicecircuits, December 5, 2009August 19, 2023
6 band graphic equaliser using 741 op-amp

6 Band Graphic Equaliser Using 741 Op-Amp IC

With this circuit you can control and blend frequencies and tones as desired.

Essentially, the circuit consists of an IC 741 whose gain at various freguencies is determined by corresponding potentiometer setting.

6 band graphic equaliser circuit using 741 op-amp bass treble control

The audiblefrequency spectrum is covered in six steps: 50Hz, 160Hz, 500Hz, 1.6kHz, 5kHz, 16kHz. All potentiometers are of 100kΩ linear type. The circuit provides adequate boost / cut for normal use.

PARTS LIST
R1, R2, R3, R4, R5, R627kΩ
R7470kΩ
R8330kΩ
R9100kΩ
R104.7kΩ
R114.7kΩ
VR1, VR2, VR3, VR4, VR5, VR6100kΩ
C1100n (104)
C233n (333)
C310n (103)
C43.3n (332)
C51n (102)
C6300pF (301)
C7100µF 16V
C84.7µF 16V
C947µF 16V
IC1741 Op amp

power supply for the circuit can be derived from the amplifier / preamplifier itself. The wide rangeof supply voltage (6V-15V) makes the circuit very versatile. Power consumption is negligible.

Please send your ideas, those are very important for our success…

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Comments (6)

  1. myo min aung says:
    November 3, 2010 at 8:45 pm

    [img]tone control circuit[/img]

    Reply
  2. John says:
    February 9, 2011 at 12:53 am

    Hi, I’m using this circuit for my 1st year electronic engineering project, however I am picking up a lot of DC noise on my Oscilloscope as the wave produced is not smooth. Has anyone got suggestions how I can solve this problem ?

    Reply
  3. RacerX says:
    February 15, 2011 at 7:50 pm

    hi john the circuit isnt complete you shuld use like 10uf filer caps in your power seply

    Reply
  4. John says:
    February 22, 2011 at 7:31 pm

    Hi cheers for the response, just going to try that now.

    Reply
  5. kyle says:
    March 10, 2011 at 4:21 pm

    the body casing of the potentiometer should be shorted to the ground to reduce noise

    Reply
  6. rob says:
    June 19, 2015 at 10:04 pm

    hi, is this circuit complete?…thanks rob.

    Reply

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