Simple Tone Controller Circuit using IC TL072 Op-amp

An IC TL072 op amp tone control circuit lets you modify the treble and bass frequencies of an audio signal.

This circuit not only enhances sound but also lets you adjust the treble and bass.

These elements are used in a certain order to provide filters that reduce or amplify particular frequencies.

Circuit Working:

Parts List:

The amplifier chip used in this tone control circuit is a unique kind known as a TL072.

With just a few more electrical components, this chip maintains excellent sound quality with little background noise.

For optimal performance it does require both positive and negative power supply.

This is how the circuit operates:

The audio signal initially passes via the TL072, a unique amplifier chip.

The feeble electrical signal is greatly strengthened by this chip, it is similar to raising the volume of the sound.

After that, the signal passes via a tone control section .

The bass and treble and other volumes may be adjusted using the knobs in this area.

Resistors R3 and R2 are used in this circuit to regulate the behavior of the amplifier.

The signal is amplified before being sent to the tone control component.

You may change the treble, bass and overall sound balance in this area.

Lastly, the signals loudness is adjusted before it reaches the speaker via the volume control knob VR2.

Additionally, a balance control knob VR3 allows you to modify the amount of signal sent to each speaker in a stereo system.

Formulas:

Tone control circuits and other audio applications can benefit from the low noise and high slew rate of the TL072, a dual operational amplifier op amp.

The following is a general equations for creating a tone controller circuit using the TL072:

Design of Filter:

For diverse frequency responses, the TL072 may be tuned in a variety of filter topologies (such as Sallen Key).

For instance, the Sallen Key low pass filters cutoff frequency, fc is provided by:

fc​ = 1​ / 2πRC

where,

• In the filter circuit, R stands for resistor and C for capacitor.

Calculating Gain:

The resistor values in the op amps feedback loop may be used to change the gain Av of the bass, midrange, and treble stages.

For example, the gain of a non inverting amplifier setup is given by:

Av​ = 1 + Rf​​ / Rin​

where,

• Rf is the resistor used for feedback, and Rin is the resistor used for input.

These formulas ought to assist you in creating a tone controller circuit that uses the TL072 op amp and is customized to your particular tone adjustment requirements (treble, midrange, and bass).

Based on the audio performance standards and desired frequency response, change the component values and configurations.

How to Build:

To build a Simple Tone Controller Circuit using IC TL072 Op-amp follow the below mentioned steps for connections:

• Assemble all the components as mentioned in the above diagram.
• Connect pin 1 of IC1 TL072 to VR4 upper leg through capacitor C3 and C6, connect a resistor R3 from pin 1 of IC1 TL072 to ground through resistor R2.
• Connect pin 2 of IC1 TL072 between resistor R3 and R2.
• Connect pin 3 of IC1 TL072 to capacitor C2 to ground, connect from positive end of capacitor C2 connect resistors R5 and R1 to ground.
• Connect audio input supply between resistors R5 and R1 through capacitor C1
• Connect pin 4 of IC1 TL072 to negative supply of -15V DC.
• Connect pin 8 of IC1 TL072 to positive supply of +15V DC.
• Connect VR1upper leg to pin 1 of IC1 TL072 through resistor R4, connect VR1 center leg to upper leg of VR2 through resistor R7, connect VR1 last leg to ground through resistor R6.
• Connect VR2 upper leg to center leg of VR4, connect center leg of VR2 to upper leg of VR3 through audio output, connect last leg of VR2 to ground.
• Connect VR3 upper leg to VR2 center leg, connect VR3 center leg to ground, connect VR3 last leg to other channels.
• Connect VR4 upper leg to pin 1 of IC1 TL072, connect center of VR4 to upper leg of VR2 via center leg of VR1, connect last leg of VR4 to ground through capacitor C7
• Connect capacitors C4 and C5 between resistors R4 and R6.

Conclusion:

This simple tone controller circuit using IC TL072 op-amp for your music functions similarly to a little sound booth.

In order to boost the sound signal, it makes use of a unique chip TL072.

Consider it as if you were cranking up a microphones level all the way.

All in all, you may play DJ with this circuit and customize the music!

Just keep in mind to work on the circuit itself with caution while handling the capacitors and to utilize the appropriate power supply.

References:

Datasheet IC TL072

What op-amp could substitute a TL072?