Tone Control Circuit Using IC TL072

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Introduction

To let you learn how to adjust the audio signal to be softer or louder, in this tutorial, we will make a “Tone Control Circuit using IC TL072.” If you want to work on projects needing bass or treble control, the TL072 is the integrated circuit you should choose. Most people find it improved over the TL071 single version, which only uses one op-amp. Yet, in addition to that, it may function as a general-purpose, dual-input operational amplifier.

Along with IC TL072, we are using some basic electronic components that are affordable and easily available. So, let’s dive more into the article to learn to make the tone control circuit.

What is Tone Control Circuit?

Tone control circuits are, in their most basic form, filter circuits. They are employed to filter audio frequency signals in such a way that only the frequencies within the required frequency range are permitted to get through to the amplifier and the loudspeakers. This allows the listener to modify the audio output by increasing either the low-frequency material via a bass boost or the level of high-frequency content via a treble boost.

Hardware Required

S.no	Component	Value	Qty
1.	IC	TL072	1
2.	Potentiometer	100K	4
3.	Electrolytic Capacitor	1uF, 2uF, 100pF, 2.2nF, 22nF, 220nF	1, 1, 1, 1, 2, 1
4.	Resistor	1K, 10K, 100K, 2.2M	2, 2, 2, 1
5.	DC Supply	15V

Circuit Diagram

Tone control circuit using IC TL072-diagram-schematic

Working Explanation

Power Supply for Circuit

To build this ‘tone control circuit,’ you first must construct the dual power supply. This power supply comprises a step-down transformer with a center-tapped output (12-0-12 V), a 1 Amp bridge rectifier for AC to DC conversion, and filtering capacitors. We can obtain a +15V-0- -15V dual supply using this circuit.

Main Circuit

An audio signal is fed into a balanced operational amplifier. Resistors R3 and R2 in this circuit act as feedback for the amplifier. This tone control circuit adjusts the output audio signal’s bass, treble, and balance. The volume is adjusted using the potentiometer VR2; the balance is adjusted using the variable potentiometer VR3.