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DESCRIPTION: This is 10 stage equalizer built with TL074 operational IC. Basicaly you can use other operational IC for this purpose, but it is best if you use operational IC with fet inputs to avoid noise and distortion. I used TL074 and it works perfect. It requires symmetrical power supply (+-15V). Input impendance is 57KΩ and output impendance is very low 200Ω. Range frequencies are:32Hz, 62Hz, 125Hz, 250Hz, 500Hz, 1KHz, 2KHz, 4KHz, 8KHz and 16KHz. Frequency bandwidth of device is 10Hz-100KHz. Distorsion is less than 0.02% and maximum output voltage is 9V.
