LM358DR

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Linear amplifiers are a type of electronic circuit used to increase the power of a signal. Among these amplifiers, the LM358DR is a very popular option for general purpose use. The LM358DR is a dual operational amplifier, and offers excellent performance at low cost. In this article, we’ll look at the application fields of the LM358DR and its working principle.

Application Fields of the LM358DR

The LM358DR is a dual operational amplifier that is popularly used in a wide variety of applications, from high-performance instrumentation and audio to medical equipment, wireless and communication systems, automotive applications, and many more. It is particularly suitable for the following types of applications:

• Instrumentation: The LM358DR can be used in various types of instrumentation, such as signal processing and conditioning, level shifting, and conversion of AC signals to DC signals.
• Audio: The LM358DR is often used in audio applications such as professional-grade sound systems, guitar amplifiers, and portable audio players.
• Medical equipment: The LM358DR can be used in various types of medical equipment, such as EEG machines, ECG machines, imaging devices such as MRI and CT, and ultrasound scanners.
• Wireless and communication systems: The LM358DR is often used in wireless and communication systems, such as GPS receivers, cordless phones, radio transceivers, and digital communication systems.
• Automotive applications: The LM358DR can be used in a variety of automotive applications, such as engine control systems, cruise control systems, emission control systems, and vehicle security systems.

Working Principle of the LM358DR

The LM358DR is an integrated circuit containing two operational amplifiers. The most basic operational amplifier is a single-ended input stage amplifier with feedback, as shown in Figure 1. Two transistors are used as the input stage, and an emitter-follower output stage is used to supply the output voltage.

Figure 1: The basic circuit of an operational amplifier. (Source: Texas Instruments)

The two transistors are configured as a differential amplifier, with one transistor amplifying the inverting input and the other amplifying the non-inverting input. The two transistors are connected in such a way that their outputs are combined and sent to the output stage. In this way, it can be seen that the input of an operational amplifier is an “open loop”, meaning it has no feedback or control from the output.

In the LM358DR, the two transistors are biased by a single current source. This reduces the power consumption of the amplifier and improves its response time. The two transistors are further connected to a pair of complementary transistors, which form the emitter-follower output stage. This stage can supply low-impedance voltages with relatively low distortion, making it well-suited to audio applications.

The LM358DR also has an internal frequency compensation network that helps to reduce the effects of frequency-dependent distortion. The amplifier can be powered using both single and dual supply voltages, and can also be operated in “split power” mode, which allows the amplifier to operate from two different supply voltages simultaneously.

Conclusion

The LM358DR is a popular operational amplifier that can be used for a wide range of applications, from high-performance instrumentation and audio to medical equipment, wireless and communication systems, and automotive applications. Its internal design consists of two transistors and an emitter-follower output stage, which provides low distortion and power consumption and makes it well-suited for audio applications. The LM358DR also has an internal frequency compensation network that helps to reduce the effects of frequency-dependent distortion, and can be powered using both single and dual supply voltages.

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