Components Expert

The working principle of ADC0804

The working principle of ADC0804

There are many kinds of integrated A/D converters, and various factors should be considered when selecting integrated chips. Generally, successive comparison type A/D converters are used more, ADC0804 is such a monolithic integrated A/D converter.

Design of boost DC-DC power supply based on TL494

Design of boost DC-DC power supply based on TL494

With the rapid development of electronic power technology today, the requirements for the power supply of devices are becoming more and more demanding. Among various types of power supplies, switching power supplies are increasingly used for their stability, high efficiency and high power density.

Application circuit diagram of TDA2822M

Application circuit diagram of TDA2822M

TDA2822M is a dual audio power amplifier integrated circuit. It is characterized by high efficiency, low power consumption, quiescent operating current of only 6mA, and the power supply voltage can work normally within the range of 1.8V to 15V.

Application design of TL431 in the feedback loop of switching power supply

Application design of TL431 in the feedback loop of switching power supply

With the development of the semiconductor industry, the applications of switching power supplies are constantly expanding. At the same time, the requirements for switching power supplies are also increasing. High power density, small size, and low price have become the trends in the switching power supply industry.

Design of power amplifier circuit based on TDA7294

Design of power amplifier circuit based on TDA7294

TDA7294 is a quite innovative DMOS high-power integrated amplifier circuit. It has swept away the raw, cold and hard tones of linear integrated amplifiers and thick film integrated in the past, and is widely used in HI-FI fields: such as home theaters, active speakers, etc.

Design of MCU and LED display circuit based on 74LS164

Design of MCU and LED display circuit based on 74LS164

AT89 series microcontroller is a new type of 8-bit CMOS microcomputer with high performance, low price, low voltage and low power consumption. Its significant advantages are: ① It contains F1ash memory, which can be modified at will during the development of the system.

Overview, circuit diagram, pins, and functionality of the 74LS48

Overview, circuit diagram, pins, and functionality of the 74LS48

The 74LS48 chip is a commonly used seven-segment digital tube decoder driver. It is commonly used in the display systems of various digital circuits and microcontroller systems. This article will introduce the pins, truth table, logic functions and common circuits of the 74LS48.

30-second countdown design based on 74LS192

30-second countdown design based on 74LS192

The 74LS192 is a synchronous decimal reversible counter that has dual clock inputs and features such as clear and set. It can be directly cascaded without external circuit, and the two output terminals of borrow and carry can be cascaded to count up and down, which is convenient to use.

Temperature measurement circuit composed of AD590

Temperature measurement circuit composed of AD590

AD590 is a current output type two-end temperature sensor made by AD company using the relationship between the forward current of the PN junction and the temperature. Due to the good linearity and interchangeability of the device, the measurement accuracy is high and the power supply fluctuations are eliminated.

Design of heart rate detection system based on AD620 chip

Design of heart rate detection system based on AD620 chip

Heart rate is a key indicator value that reflects physical health. In simple terms, heart rate refers to the frequency of cardiovascular beats in 1 minute. The heart rate test can provide scientific evidence for disease diagnosis, patient care, and player training.

74LS244 pin diagram and function, application circuit

74LS244 pin diagram and function, application circuit

The 74LS244 is a 3-state 8-bit buffer, generally used as a bus driver. The 74LS244 has no latching function. The address latch is a temporary register, which temporarily stores the address code on the bus according to the state of the control signal.

Design of display drive circuit based on 74HC164

Design of display drive circuit based on 74HC164

One of the important features of intelligent household appliances is human-computer information interaction. The user understands the working state of the household appliance through visual, auditory and other means, and at the same time controls the work of the appliance through input devices such as buttons.

Design of practical liquid level gauge based on LM567

Design of practical liquid level gauge based on LM567

For the owners of small oil depots and oil storage tanks such as small and medium-sized gas stations, it is necessary to know the oil storage volume at any time, so as to maintain the basic balance of oil inflow and outflow.

Design of low battery alarm system for automobile battery based on LM741

Design of low battery alarm system for automobile battery based on LM741

In recent years, with the continuous development of new technologies, batteries as a power source not only play an important role in transportation (railway, subway, ship), power generation, communication, aerospace, chemical industry, traditional automobile and other industries, but also have begun to be used as a power source.

Precautions for the use of LM311

Precautions for the use of LM311

LM311 is a commonly used linear comparator, which is widely used in comparison and shaping circuits, as shown in Figure 1. However, unexpected problems often occur in LM311 applications, that is, the output pulse signal is not as ideal as theoretical analysis…

LM1875 features, application and pin introduction

LM1875 features, application and pin introduction

LM1875 is a power amplifier integrated block, it has few peripheral circuits and perfect overload protection function in use. It adopts advanced electronic circuit design technology and process, so it can even have low distortion at high output.

Design and improvement of LM3886 power amplifier circuit

Design and improvement of LM3886 power amplifier circuit

In order to solve the problem of transient distortion, the typical application circuit of the LM3886 power amplifier is changed to a current negative feedback type, and the current sampled through the speaker voice coil is fed back to the input end of the power amplifier with a resistor, and the speaker system is also included in the feedback system.

Design of uninterruptible DC power supply based on LM2596

Design of uninterruptible DC power supply based on LM2596

The uninterruptible DC power supply is a system equipment that connects the battery (mostly lead-acid maintenance-free battery) with the host and converts the DC power into the commercial power through the host inverter and other module circuits.

Design of AC zero-crossing detection circuit based on LM339

Design of AC zero-crossing detection circuit based on LM339

Due to the problems of complex structure, inaccurate zero-crossing detection and cumbersome programming in the zero-crossing detection circuit of the AC circuit, this paper introduces a zero-crossing detection circuit with a simple hardware structure based on LM339.

Design of solar tracking trolley based on LM393 voltage comparator

Design of solar tracking trolley based on LM393 voltage comparator

Tracking trolley is a trolley that can drive along the preset motion track line, and it is used in many experimental teaching places. In the whole process of the tracking trolley driving, how to make the car drive along the motion track route accurately without big error is the essence of using the tracking trolley.

Design of simple waveform generator based on LM324

Design of simple waveform generator based on LM324

In electronic technology, waveform signals such as square wave and triangular wave are often used to generate power supply circuits, which are often used to generate data signals of various electronic devices, communicate between electronic technologies, and their automatic measurement and control systems and automatic control systems.

Design of LED level indicator circuit based on LM324

Design of LED level indicator circuit based on LM324

LED level indicator (English LED level indicator) can indicate the size of the signal level, on the other hand, it can play a role in decorating and beautifying the panel. The LED level indicator is a level indicator composed of light-emitting diodes.

Characteristics and working principle of LM358

Characteristics and working principle of LM358

The LM358 includes two independent, high-gain, internal frequency compensated dual operational amplifiers, which are suitable for single-supply use with a wide range of power supply voltages, and are also suitable for dual-supply operating modes.

Design of voice-activated delay switch circuit based on LM358

Design of voice-activated delay switch circuit based on LM358

The LM358 is an integrated circuit that integrates two operational amplifiers, so it is called a dual-operation integrated circuit. Its packaging forms include plastic-encapsulated 8-lead dual in-line, SMD and circular metal shell packages. It is widely used in signal amplification and voltage comparison circuits.

Charger circuit based on LM358 design

Charger circuit based on LM358 design

Because the LM358 includes two independent, high gain, internal frequency compensated operational amplifiers, it is suitable for single-supply use with a wide supply voltage range, and is also suitable for dual-supply operating modes.

Application circuit diagram of LM358

Application circuit diagram of LM358

The dual operational amplifier LM358 is suitable for single-supply use with a wide supply voltage range. It is also suitable for dual-supply operation mode. Under the recommended operating conditions, the supply current is independent of the supply voltage.

The circuit design composed of LM358

The circuit design composed of LM358

The LM358 is a dual operational amplifier with a wide range of applications, which has the advantages of low price and wide voltage range. This article will introduce the circuit design composed of LM358.

The difference between LM358, LM324 and LMV358

The difference between LM358, LM324 and LMV358

The LM358 is a dual operational amplifier. It includes two independent, high-gain, internal frequency-compensated operational amplifiers, which are suitable for single-supply use with a wide supply voltage range, as well as dual-supply operating modes.

Pin function and technical parameters of LM358P

Pin function and technical parameters of LM358P

LM358P is a very high-grade dual operational amplifier circuit with high stability and low price. This chip is composed of two independent high-gain operational amplifiers. It works independently under the condition of dual power supply and has internal frequency compensation.

PWM filtering based on LM358 to realize digital-to-analog conversion circuit

PWM filtering based on LM358 to realize digital-to-analog conversion circuit

Based on the spectrum theory analysis of pulse width modulation (PWM) waveform, in view of the requirement of (±10)V analog signal input required for AC servo motor to realize speed closed-loop control, this paper designs a (±10)V analog signal output based on PWM filtering based on LM358 chip circuit.

Design of linear DC regulated power supply based on LM358

Design of linear DC regulated power supply based on LM358

In today’s society, people enjoy the great convenience brought by electronic equipment, but any electronic equipment has a common circuit – power circuit. The requirement of electronic equipment for the power supply circuit is to be able to provide continuous and stable power that meets the load requirements, and usually…

The working principle and characteristics of LM386

The working principle and characteristics of LM386

LM386 is a common type of integrated OTL type power amplifier circuit. It is an audio integrated power amplifier. It has the advantages of low power consumption, adjustable internal chain gain, large power supply voltage range, few external components and low total harmonic distortion.

Walkie-talkie circuit based on LM386 design

Walkie-talkie circuit based on LM386 design

The positive power amplifier integrated circuit LM386 is commonly known as “universal power amplifier circuit” because of its wide application. LM386 has the advantages of low power consumption, wide operating voltage range, few peripheral components, and convenient device adjustment.

Oscillator circuit composed of LM386

Oscillator circuit composed of LM386

LM386 is a low-power audio amplifier integrated circuit. It adopts 8-pin dual-in-line plastic package. The working voltage is 4V-15V. When the power supply voltage is 12V, the output power of 300mW can be obtained on an 8Ω load. Various oscillators can be easily made with LM386.

Measures and precautions for preventing self-excited howling of LM386

Measures and precautions for preventing self-excited howling of LM386

LM386 is widely used in audio power amplifier circuits. In most occasions or when used alone, LM386 can work normally, but when used in conjunction with other circuits, it may cause self-excitation and reduced sensitivity. This article mainly introduces the prevention measures to deal with this phenomenon and the precautions…

Typical application circuit of LM386

Typical application circuit of LM386

To minimize external components, the voltage gain is built in to 20. But by adding an external resistor and capacitor between pins 1 and 8, the voltage gain can be adjusted to any value up to 200. The input is referenced to status, while the output is automatically biased to…

Pager circuit and voice circuit composed of LM386

Pager circuit and voice circuit composed of LM386

Pager circuit is composed of a preamplifier stage and LM386 low-power integrated circuit. The circuit is simple, the cost is low, the volume is small, and it is easy to use. It is suitable for beginners to make electronic hobbies. After actual use, the sound is clear…

Various circuits composed of LM386

Various circuits composed of LM386

The operating voltage range of the LM386 power amplifier integrated circuit is wide, the minimum is 4V, and the maximum is 15V. Its static power consumption is only 4mA, and the gain is up to 46dB, or 200 times. Its circuit is simple and there are few peripheral components, so…