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Return to Blog10 Band Graphic Equalizer by TL074 JFET Op-Amp
Posted Jan 14, 2012 at 10:54 am
Figure 1
This one is a 10 band graphic equalizer circuit based on TL074 low noise JFET op-amp. As shown in the diagram, there are 10 same units that only differ in capacitance values of capacitors which determine the frequency band of each filter. The potentiometers adjust the predetermined regions of frequency in each unit. The center frequencies of the regions are; 32Hz, 64Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz and 16kHz.
RV resistors prevent the frequency interference. But if any interference occurs, the filters act as cut-off to an unrelated signal.
The components must be high quality and have low tolerance. The resistors must be metal-film type.
To use this graphic equalizer in stereo mode, you must construct two of them with matched components so there won’t be any difference in regulation of frequency bands.
S1 switch bypasses the graphic equalizer and then the circuit gives an output of flat response.
The graphic equalizer must be connected between a preamplifier unit and a power amplifier unit.
The components list is given in the schematic page.
Read More:users.otenet.gr/~athsam/EQ_10_band.htm
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2 years ago: what does the separated circuit do? is it still part of the main circuit? i like setting my equalizers depending on the type of music i listen to...
2 years ago: this is more like it...the more equalizers, the better!!!
2 years ago: VERY HELPFUL AND SAVES A HELL OF A LOT OF RESEARCH FOR FREQU SPLITTING.
7 months ago: Do i still need to install a tone circuit before the equalizer?.