Simple Mini Audio Amplifier Circuit using IC TDA7052

In electronics making small audio amplifier can help improve music sound for many uses.

This is Simple Mini Audio Amplifier Circuit using IC TDA7052 which is shown in diagram below.

It needs few parts and easy to build and is good for better sound in small projects.

This circuit is very good for DIY and hobby people which is easy and works well.

Circuit Working:

Parts List:

This small power with low noise audio amplifier is made for compact use and its main part is IC TDA7052.

It is easy to use and fits in small size because everything is inside the chip.

Audio signal comes from one input like phone or music player and goes to the TDA7052 IC.

IC makes sound louder.

The circuit works with 6V power from battery or power adapter.

We can control sound level using VR1 4.7k potentiometer which changes input signal level.

Capacitors C1 and C2 help remove noise and keep sound clear.

The loud signal then goes to 8Ω speaker to play sound.

Formulas:

To make and understand TDA7052 mini audio amplifier we can use some basic formulas.

Power Calculation:

To find power of amplifier:

P = Vout² / Rload

where,

• P is the power in watts
• Vout is the output voltage in volts
• Rload is the speaker resistance in ohms

For 8Ω speaker:

P = Vout² / 8

Voltage Gain:

TDA7052 has fixed gain.

If using adjustable gain amplifier:

Gain = Vout / Vin

where,

• Vout is the output voltage
• Vin is the input voltage

This does not apply for TDA7052 since gain is built-in.

Capacitor C2 is 100nF which is the Coupling Capacitor:

• It lets audio AC pass and blocks DC.
• Affects sound frequency.

Cutoff frequency (fc) = 1 / (2π × Rload × C)

where,

• fc is the cutoff frequency in Hz
• Rload is the speaker resistance
• C is the capacitance in farads

Capacitor C1 220µF is the Filter Capacitor:

• It is used for power noise filter and stable voltage.

Ripple voltage (Vr) = Iload / (f × C)

where,

• Vr is the ripple voltage in volts
• Iload is the current used amps
• f is the frequency in Hz
• C is the capacitance in farads

These formulas help us understand how amplifier works.

Power depends on voltage output and speaker ohms.

How to Build:

To build a Simple Mini Audio Amplifier Circuit using IC TDA7052 follow the below mentioned connections steps:

• Collect all parts as shown in the circuit diagram.
• Connect pin 1 of IC1 TDA7052 to +6V power.
• Connect pin 2 of IC1 to middle leg of VR1 4.7k potentiometer.
• First leg of VR1 goes to audio input and third leg goes to ground.
• Connect pin 3 and pin 6 of IC1 to ground.
• Connect pin 5 of IC1 to one wire of 8Ω speaker.
• Connect pin 8 to other wire of 8Ω speaker.
• Put C1 and C2 capacitors between +6V and ground.

Notes:

• This mini audio amp can be used in many ways:
• Good for DIY audio projects which makes homemade sound better.
• Good for small portable speakers and works on battery.
• It is useful for learning and is an easy example for audio amplifier.

Conclusion:

This Simple Mini Audio Amplifier Circuit using IC TDA7052 is easy and cheap project.

It uses TDA7052 IC to build small but good mini audio amplifier.

Requires few parts, easy to make and is good for small audio work.

References:

TDA7052 output DC offset