There is neither a transformer nor a large capacitor at the output end of the OCL circuit. This circuit is widely used in audio amplifiers with low power output. It has the characteristics of small distortion, light weight, small size, and is conducive to integration. 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. Performance Indicators : distortion, frequency response, signal-to-noise ratio, and efficiency.Function: To provide the required power for the output load of the audio amplifier.For the latter, the range of pitch adjustment is wider, but the noise and distortion are greater. 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. The tone control circuit is mainly divided into a negative feedback tone control circuit and an attenuation tone control circuit. Therefore, the output volume can be kept stable. 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. If the performance of a tone control circuit is good enough, its frequency adjustment range should be wide enough. In the high-fidelity stereo audio playback circuit, we usually use a tone control circuit with adjustable treble and bass. 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. 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. Tone Control Circuit is mainly composed of a high-pass filter and a low-pass filter. The signals in other frequency bands remain unchanged. In other words, by boosting a certain frequency band signal or attenuating a certain frequency band signal. 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. Only by meeting these two requirements, can the signal of the preamplifier be output without distortion. Ensure that its frequency band is wide enough.The noise of the power tube should be very low.There are also the following two requirements for preamplifiers: The matching of voltage amplitude and sensitivity.
Therefore, the main functions of the preamplifier are as follows: 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. The input sound of the audio amplifier is very different, and the output voltage range is also very large. The pre-amplifier amplifies the audio signal so that the amplified signal is within the input range of the power amplifier. Block Diagram of Sound Amplifier Circuit III Characteristics and Requirements of Circuits 3.1 Pre-amplification Circuit Its circuit composition block diagram is shown as in Fig. In the end, satisfactory treble and bass control effects can be obtained. 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. Finally, it enters the power amplifier for amplification to provide the maximum undistorted audio power to the speaker. Then, the signal enters the tone control circuit for high and low tone control. The microphone signal is first amplified by the amplifier. The audio amplifier circuit is mainly composed of 3 parts: 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. It requires high output power, low distortion, and high efficiency.įor integrated circuits, it has the characteristics of low price, light weight, and good performance, so it is widely used in audio amplifiers. In your impression, what is an audio amplifier? An audio amplifier is a device that restores electrical signals to sound signals. III Characteristics and Requirements of Circuits
This is why NE5532 can always be widely used in audio systems such as home audio and high-fidelity stereo.
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