It is often useful to equlize the audio signals, specially for people who manipulate audio signals. The proposed circuit is a ten-band equalizer which uses low cost Op-Amps to form a professional equalizer circuit. The heart of the design is a classical band-pass active filter. The Op-Amp U11 acts like an attenuator to prepare the proper signal level for band-pass filters. The Op-Amp U13 acts like final voltage amplifier to deliver the equlized audio signals to the next stage which can be the input of an audio power amplifier. The voltage sources VCC/VDD which feed the circuit should lay between +12/-12 to +15/-15 VDC respectively.