Build Your 3-Band Equalizer Circuit (TL072)

Description

A standard circuit for audio tone control of a three-way system is presented, enabling adjustment of low, mid, and high frequencies of sound signals. The amplification and attenuation are controllable within a range of ±18 dB per octave. The circuit utilizes a power supply of ±15V, although it can also operate with a single supply ranging from +9V to +30V, provided the connection is made to pin 4 of IC1, at 0V, and the circuit is then connected as depicted in figure 2. Half the supply voltage is applied to the non-inverting input of IC1, through the 5 and 3 equivalents, which are subsequently disconnected from ground.

More about components

IC1, a TL072 or NE5532 operational amplifier, plays a crucial role in this circuit. Operational amplifiers are integrated circuits designed to amplify weak electrical signals. The TL072 and NE5532 are dual operational amplifiers, offering convenience and space-saving benefits. They are widely used in audio circuits due to their low noise, high accuracy, and stable performance over temperature variations. These components provide the amplification necessary for the tone control functionality.

Circuit diagram

Part list

Warnings

**Security Warning:** This circuit diagram is provided for informational purposes only. Modifications to the circuit may compromise its performance or safety. Ensure you have a thorough understanding of electronics and safety precautions before attempting any modifications. The author is not responsible for any damages or injuries resulting from the use of this information.

Source

Circuit diagram sourced from online electronics database.