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How Does NE5532 Audio Amplifier Circuit Work? [FAQ]

Author: Iggy
Date: 9 Dec 2020
 10960
ne5532 circuit

I Description

This blog will introduce a sound amplifier designed based on NE5532 and TDA2030 integrated circuits. It mainly includes the following parts: the composition, function and working principle of audio amplifier. In terms of its characteristics, this amplifier has the following advantages:

  • Small transient intermodulation distortion;
  • High output power;
  • The circuit is simple & easy to make.

This is why NE5532 can always be widely used in audio systems such as home audio and high-fidelity stereo.

Catalog

I Description

II Composition of Audio Amplifier

III Characteristics and Requirements of Circuits

3.1 Pre-amplification Circuit

3.2 Tone Control Circuit

3.3 Power Amplifier Circuit

IV Introduction of Integrated Devices

4.1 Integrated Op Amp NE5532

4.2 Integrated Power Amplifier TDA2030

V Design of Audio Amplifier

5.1 Design of Preamplifier Circuit

5.2 Design of Tone Control Circuit

5.3 Design of Power Amplifier Circuit

VI Sound Amplifier Simulation

FAQ

Ordering & Quantity

II Composition of Audio Amplifier

In your impression, what is an audio amplifier? An audio amplifier is a device that restores electrical signals to sound signals. It requires high output power, low distortion, and high efficiency.

For integrated circuits, it has the characteristics of low price, light weight, and good performance, so it is widely used in audio amplifiers. This blog will conduct in-depth research on audio amplifiers, using NE5532 integrated operational amplifier and TDA2030 integrated power amplifier to design an audio amplifier.

The audio amplifier circuit is mainly composed of 3 parts:

  • Preamplifier circuit;
  • Tone control circuit;
  • Power amplifier circuit.

The microphone signal is first amplified by the amplifier. Then, the signal enters the tone control circuit for high and low tone control. Finally, it enters the power amplifier for amplification to provide the maximum undistorted audio power to the speaker. Users can boost or attenuate the bass with 100Hz as the control point and the treble with 10kHz as the treble control point according to their needs. In the end, satisfactory treble and bass control effects can be obtained. Its circuit composition block diagram is shown as in Fig. 1.

Figure 1. Block Diagram of Sound Amplifier Circuit

III Characteristics and Requirements of Circuits

3.1 Pre-amplification Circuit

The pre-amplifier amplifies the audio signal so that the amplified signal is within the input range of the power amplifier. The input sound of the audio amplifier is very different, and the output voltage range is also very large. Some input signals need to be power compensated first and then amplified by a power amplifier, which can make the frequency characteristic curve more flat.

Therefore, the main functions of the preamplifier are as follows:

  • Matching impedance;
  • The matching of voltage amplitude and sensitivity.

There are also the following two requirements for preamplifiers:

  • The noise of the power tube should be very low;
  •  Ensure that its frequency band is wide enough.

Only by meeting these two requirements, can the signal of the preamplifier be output without distortion.

3.2 Tone Control Circuit

The main function of the tone control circuit is to adjust the frequency response curve shape of the audio amplifier in the audio frequency band. In other words, by boosting a certain frequency band signal or attenuating a certain frequency band signal. The signals in other frequency bands remain unchanged.

Tone Control Circuit is mainly composed of a high-pass filter and a low-pass filter. Therefore, on the one hand, it can control the timbre of the audio signal; on the other hand, it also can compensate for the lack of frequency components in the signal. In this way, not only the tone of the sound reproduction system is improved, but also the sound reproduction effect of the sound is improved.

In the high-fidelity stereo audio playback circuit, we usually use a tone control circuit with adjustable treble and bass. If the performance of a tone control circuit is good enough, its frequency adjustment range should be wide enough. In this way, the amplitude of the mid-range signal will not change much during the change of the tone of the audio amplifier from the weakest to the strongest. Therefore, the output volume can be kept stable.

The tone control circuit is mainly divided into a negative feedback tone control circuit and an attenuation tone control circuit. For the former, the noise and distortion are relatively small, and its corner frequency is basically unchanged, but the slope of the characteristic curve will change accordingly. For the latter, the range of pitch adjustment is wider, but the noise and distortion are greater.

3.3 Power Amplifier Circuit

  • Function: To provide the required power for the output load of the audio amplifier.
  • Performance Indicators : distortion, frequency response, signal-to-noise ratio, and efficiency.
  • Classification: OTL, OCL and BTL.
  • OTL

The OTL type is a push-pull power amplifier circuit with no transformer at the output end and only a large capacitance, which is a single power supply power amplifier circuit. It has the characteristics of small distortion, light weight, small size, and is conducive to integration. This circuit is widely used in audio amplifiers with low power output.

  • OCL

There is neither a transformer nor a large capacitor at the output end of the OCL circuit. It is a commonly used amplifying circuit for the dual power supply amplifier circuit.

  • BTL

The BTL power amplifier circuit usually uses a circuit without an output transformer. When the power supply voltage is low, the output load power is larger, which improves the utilization rate of the power supply. It is generally used when the output power is large.

The application of integrated power amplifier is becoming more and more extensive. This is because the integrated power amplifier has the functions of small distortion, small size, light weight, low power consumption, high cost performance, overvoltage protection and noise cancellation.

IV Introduction of Integrated Devices

4.1 Integrated Op Amp NE5532

The integrated operational amplifier NE5532 has strong output drive capability and good noise signal. It also has a higher power bandwidth and small signal. Therefore, NE5532 is a high-performance low-noise dual op amp operational amplifier.

  • Equivalent Input Noise Voltage: 5 nV/√Hz Typ at 1 kHz
  • Unity-Gain Bandwidth: 10 MHz Typ
  • Common-Mode Rejection Ratio: 100 dB Typ
  • High DC Voltage Gain: 100 V/mV Typ
  • Peak-to-Peak Output Voltage Swing 26 V Typ With VCC± = ±15 V and RL = 600 Ω
  • High Slew Rate: 9 V/μs Typ

4.2 Integrated Power Amplifier TDA2030

TDA2030 is a V-shaped 5-pin single in-line package structure. It has the characteristics of small transient intermodulation distortion, high rate of rise, large output power, small size and light weight. And it has over-current and over-voltage protection circuits inside.

V Design of Audio Amplifier

5.1 Design of Preamplifier Circuit

NE5532 integrated operational amplifier has the advantage of high input impedance. Usually, the voltage series negative feedback circuit constructed with it is used as the first stage of the preamplifier. The voltage parallel negative feedback circuit formed by it is used as the second stage of the preamplifier. The circuit has strong resistance to common-mode signal interference and low output impedance.

The design of the preamplifier circuit is shown in Figure 2.

ne5532 preamplifier circuit

Figure 2. NE5532 Preamplifier Circuit

Among them,

  • C9 and C1 are decoupling capacitors, their function is to eliminate low-frequency self-oscillation;
  • C10 and C12 are high frequency filter capacitors;
  • R5 and C7 determine the lower limit frequency of the preamplifier.

5.2 Design of Tone Control Circuit

The audio amplifier adopts a negative feedback tone controller. The circuit design is shown as in Fig. 3.

ne3352 tone control circuit

Figure 3. NE3352 Tone Control Circuit

  • Rp1: Bass adjustment potentiometer;
  • Rp2: Tweeter adjustment potentiometer;
  • C13: Coupling capacitor;
  • C14: bass boost capacitor;
  • C15: bass decay capacitor;
  • C16: High pitch boost and attenuation coupling capacitor.

among them:

  • C16 should be much smaller than C14;
  • Rp1=Rp2=200k
  • R13=R14=R15=22k
  • C14=C15=0.02μF
  • Rp2=9R13.

When the capacitive reactance is large, it is equivalent to an open circuit, and when the capacitive reactance is small, it can be regarded as a short circuit. Therefore, the capacitor C16 is equivalent to an open circuit, and adjusting the sliding rheostat Rp2 will not affect the bass adjustment.

When the sliding rheostat Rp1 moves to the left end, the capacitor C14 can be regarded as a short circuit. For the bass signal, the capacitance of the capacitor C15 is relatively large, which can boost the bass signal.

When the sliding rheostat Rp1 moves to the right end, C15 can be regarded as a short circuit, and the circuit can be used to achieve the effect of bass attenuation.

The capacitive reactance of C14 and C15 is small relative to the tweeter signal, which is equivalent to a short circuit. When the sliding rheostat moves to the far left end, the tweeter signal can be boosted, and when Rp2 slides to the far right end, it plays the role of treble decay.

5.3 Design of Power Amplifier Circuit

The integrated power amplifier has the characteristics of simple circuit, low price, and stable operation. The design in this blog uses the TDA2030 integrated circuit with excellent performance, which has the advantages of low harmonic distortion and overheating protection. The circuit is used as an OCL power amplifier, as shown in the figure. The function of the diodes D1 and D2 in the picture is to protect the circuit. On the one hand, it is to prevent the polarity of the power supply from being reversed; on the other hand, it is to limit the amplitude of the input signal. The output phase shift correction network is composed of resistor R22 and capacitor C22 so that the load is equivalent to a pure resistor. The lower limit frequency of the power amplifier circuit is usually determined by the input coupling capacitor C17. Capacitors C19 and C20 are low-frequency and high-frequency bypass capacitors respectively, and resistor Rp3 is a volume adjustment potentiometer.

tda2030 power amplifier circuitFigure 4. TDA2030 Power Amplifier Circuit

VI Sound Amplifier Simulation

Use Multisim software to simulate the audio amplifier. As shown in Figure 5. Test whether the operating voltage of each operating point is consistent with the theoretical value, and adjust the parameters of the circuit based on the obtained test results. Through repeated testing and adjustment of the circuit, the various indicators of the circuit meet the requirements.

ne5532 circuit

Figure 5. Simulation Circuit of Audio Amplifier


FAQ

  • What is NE5532?

The NE5532 is a Dual Low Noise Op-Amp in 8-pin package commonly used as amplifiers in audio circuits for its noise immunity and high output drive capability. The Op-Amp is internally compensated for high unity gain with maximum output swing bandwidth, low distortion and high slew rate.

  • How to check NE5532 IC with digital multimeter?

  • Whats the size of NE5532 produced by Texas Instruments? Anything to compare?

You will find all physical sizes in inches as well as millimeters in page 19 of the official TI datasheet at:
http://www.ti.com/lit/ds/symlink/ne5532.pdf

  • What are the features of NE5532?

NE5532 is similar to many standard operational amplifiers, but it has the characteristics of better noise performance, excellent output drive capability, high small signal bandwidth, and large power supply voltage range. Therefore, NE5532 is very suitable for high-quality and professional audio equipment, instruments, control circuits and telephone channel amplifiers.

 

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
NE5532AD NE5532AD Company:Texas Instruments Remark:General Purpose Amplifier 2 Circuit Differential 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Buy
Price:
1+: $1.17000
10+: $1.04400
25+: $0.99120
100+: $0.76110
250+: $0.67260
500+: $0.63720
1000+: $0.49560
2500+: $0.47082
5000+: $0.45312
Buy
NE5532AD8 NE5532AD8 Company:ON Semiconductor Remark:General Purpose Amplifier 2 Circuit 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Buy
Price:
20+: $0.47000
Buy
NE5532AD8G NE5532AD8G Company:ON Semiconductor Remark:General Purpose Amplifier 2 Circuit 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Buy
Price:
1+: $1.40000
10+: $1.25100
25+: $1.18720
100+: $0.91160
250+: $0.80560
500+: $0.76320
1000+: $0.59360
2500+: $0.56392
5000+: $0.54272
Buy
NE5532AD8R2 NE5532AD8R2 Company:ON Semiconductor Remark:General Purpose Amplifier 2 Circuit 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Buy
Price:
Call
Buy
NE5532AD8R2G NE5532AD8R2G Company:ON Semiconductor Remark:General Purpose Amplifier 2 Circuit 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Buy
Price:
1+: $0.87000
10+: $0.78000
25+: $0.74080
100+: $0.56870
250+: $0.50256
500+: $0.47610
1000+: $0.37030
2500+: $0.35178
5000+: $0.33856
12500+: $0.32798
25000+: $0.31740
Buy
NE5532ADR NE5532ADR Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:30000
Inquiry
Price:
2500+: $0.15950
5000+: $0.14850
12500+: $0.14080
25000+: $0.13750
62500+: $0.13530
Inquiry
NE5532ADRE4 NE5532ADRE4 Company:Texas Instruments Remark:General Purpose Amplifier 2 Circuit Differential 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $0.52000
10+: $0.44300
25+: $0.41320
100+: $0.30680
250+: $0.25960
500+: $0.24780
1000+: $0.18290
2500+: $0.17110
5000+: $0.15930
10000+: $0.15104
25000+: $0.14750
62500+: $0.14514
100000+: $0.14160
Inquiry
NE5532ADRG4 NE5532ADRG4 Company:Texas Instruments Remark:General Purpose Amplifier 2 Circuit Differential 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Buy
Price:
1+: $0.52000
10+: $0.44300
25+: $0.41320
100+: $0.30680
250+: $0.25960
500+: $0.24780
1000+: $0.18290
2500+: $0.17110
5000+: $0.15930
10000+: $0.15104
25000+: $0.14750
62500+: $0.14514
100000+: $0.14160
Buy
NE5532AN NE5532AN Company:ON Semiconductor Remark:General Purpose Amplifier 2 Circuit 8-PDIP Package:8-DIP (0.300"", 7.62mm)
DataSheet
In Stock:On Order
Buy
Price:
Call
Buy
NE5532ANG NE5532ANG Company:ON Semiconductor Remark:General Purpose Amplifier 2 Circuit 8-PDIP Package:8-DIP (0.300"", 7.62mm)
DataSheet
In Stock:On Order
Inquiry
Price:
Call
Inquiry

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1 comment

    • Michael Nolan on 2020/11/23 15:41:15

    Cap on negative voltage rail wrong polarity on some diagrams

      • author on 2020/12/2 18:01:31
        author

      Re:

      Sorry, we will correct it as soon as possible.

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