[Photo] Earphone and speaker protection circuit

This article will solve two problems: (1) How to follow IEC 61000-4-2, IEC 61000-4-4 and ...

This article mainly introduces the typical application circuit summary of s8050 (protector / wireless remote control switch / DC motor overcurrent protection circuit). The city introduced this time ...

This article mainly introduces the simple overheat protection circuit diagram Daquan (five simple overheat protection circuit design schematic diagram in detail), the overheat protection circuit at the chip temperature ...

Introduction The external high-voltage transients that interact with the system's analog input and output nodes may destroy integrated circuits (IC ...

This article mainly introduces the 8050 speaker protection circuit diagram (transistor / bridge pick-up type / two-channel speaker protection circuit in detail). The following consists of 85 ...

This article mainly introduces the classic loudspeaker protection circuit diagram (a detailed explanation of five classic loudspeaker protection circuit diagrams). The basic function of the protection circuit is: open ...

This article mainly introduces the speaker delay protection circuit diagram (uPC1237 speaker / amplifier tube / integrated multi-function protection circuit). ...

POS machine can be divided into handheld POS machine, desktop POS machine, mobile phone POS machine according to model. Hand-held POS machine, also called mobile point of sale, is a ...

In order to prevent the influence of the reverse connection of the power supply on the circuit, the reverse battery protection circuit is very necessary. This article brings you an introduction to the reverse battery protection circuit diagram ...

Various lightning protection

Overheat protection circuit has very important significance for power integrated circuits.The so-called power integrated circuit refers to a certain load capacity and a higher voltage ...

When designing circuits, many engineers will not forget to add a variety of protection circuits, especially in particularly fragile I / O ports. Maybe you didn't pay attention to ...

The function of Q0 is to detect the working temperature of the chip. Under normal circumstances, the potential VE of the reflective electrode of the triode, that is, the potential of the negative terminal of the comparator is higher than the potential of the positive terminal, which is more

Under the condition that the electrical technical indicators meet the requirements of normal use, in order to make the power supply work safely and reliably in harsh environments and sudden failures, many designs must be ...

USB1.1, USB2.0, SD card, MMC card and other interfaces, because the user is often hot swappable in use, the chip on the board is very vulnerable ...

In the design and manufacturing process of the inverter, overcurrent short-circuit protection is a very important link, which largely determines the inverter in actual use ...

Many battery-powered systems require a visual indicator to indicate when the battery needs to be replaced. LEDs are generally used as such indicators, but they are at least ...

Optocoupler is also called photoelectric isolator or photocoupler, referred to as optocoupler for short. It is a device that uses light as a medium to transmit electrical signals. It usually emits light ...

The AVR's own BOD circuit is used to generate a reset signal when the voltage is too low (below the set value) to prevent the CPU from accidentally acting. For EEPR ...

Transient voltage suppression tube TVS has fast response speed, large transient power, low leakage current, and breakdown point smoke deviation, clamping voltage is easier to control, small size, etc ...

This article focuses on the design process of the protection circuit in the power supply, using the on-resistance of the field effect tube as the detection resistance, monitoring its voltage drop, when the voltage drop exceeds ...

There are always some unstable factors in the circuit design, and the circuit used to prevent such unstable factors from affecting the circuit effect is called a protection circuit. For example, there are ...

Mainly used to monitor the running state of the motor, and aim at the starting timeout, undervoltage, overvoltage, underload, overload, etc ...

The motor protector improves the reliability of motor operation and the requirements of system intelligence, so the reliable operation of the protector plays an important role, and at the same time ...

For an end-to-end EMC compatible design, filtering the power supply (VBUS) is also very important. Many developers ignore this, but ...

The DC load can also adopt the above scheme for lightning protection, and for the lightning protection of the AC load (ie the output of the inverter), you need to use ...

The automotive environment is very demanding for electronic products: any circuit connected to a 12V power supply must work in the nominal voltage range of 9V to 16V ...

Transient suppression (TVS) diodes, also known as clamp diodes, are a high-performance circuit protection device commonly used at present. Its appearance is similar to ordinary diodes ...

With the wide application of integrated circuit technology and the increasing integration, the power consumption of VLSI and the temperature inside the chip are constantly ...

It is designed to work independently for the left and right channels. In the picture (taking the left channel as an example), R2, C4 and VT2, VT3 form a start-up delay circuit to prevent ...

The system takes LPC2132 as the core, and has an extended test current generation and adjustment module, action execution unit, current detection circuit, keyboard, etc ...

Under normal circumstances, the DC power input anti-reverse protection circuit uses the unidirectional conductivity of the diode to achieve anti-reverse protection. In addition, you can also use a diode bridge ...

This subsystem design demonstrates the implementation of IC-based overvoltage protection, overcurrent protection, reverse current protection, reverse polarity protection, and leakage line protection, and ...

In PoE equipment, the power supply equipment (PSE) supplies power to the powered equipment (PD) through an Ethernet cable. Data communication via Ethernet cable ...

With the rapid development of the power system, the scale of China's power grid is getting larger and larger, and the structure is becoming more and more complicated, which puts forward higher requirements for the performance of line protection devices ...

Because PTC does not distinguish polarity, as long as it is connected in series in the load circuit, it is not limited by space, and the installation position is extremely flexible and convenient, so it has received more and more ...

The working principle of the device is shown in the figure. After the capacitor C1 reduces the 220V AC mains voltage and limits the current, it is rectified by the diodes VD1, VD2, and the capacitor C2 ...

In traffic accidents, traffic accidents caused by drunk driving account for a considerable proportion. To stop drunk driving, we need to install a drink on the car ...

Nowadays, the power consumption of smart phones is increasing, most of the batteries of smart phones are not removable, and a mobile Power Bank with large capacity and convenient portability has become a ...

When the voltage is lower than 180V or higher than 250V, an audible and visual alarm can be performed. When an external AC contactor is connected, the power can be cut off to protect the electrical equipment.

The hardware of microcomputer relay protection mainly includes: the part that can collect data information in real time, the part that controls all actions, the switch input / output part ...

For mobile power, many people always use capacity as a hero, but under the premise that the mobile power market environment is complex and a unified standard has not yet been developed, the capacity is very ...

This article designs a kind of undervoltage protection circuit under CMOS process, first analyzes the working principle of the circuit, and then gives the parameter calculation of each MOS tube ...

This article is aimed at the use of power lithium batteries in groups. Each lithium battery requires protection from charging overvoltage, discharging undervoltage, overcurrent, and short circuit.

The design and implementation of a MOSFET device protection circuit based on CPLD technology are introduced. The circuit design has strong anti-interference ability and loud ...

This article aims at the lithium battery protection circuit, while considering the function realization, focusing on the power consumption point of view, using the key circuit in the analog circuit ...

Tao Xianfang, a well-known domestic power supply technical expert, has worked tirelessly and still insists on solving problems for power supply engineers or enthusiasts during the bi-section period.

Insulated Gate Bipolar Tramistor (IGBT) is MO ...

This article will introduce an over-temperature protection circuit that can be implemented with a standard CMOS process. In circuit design, a current source proportional to temperature (PT ...

The input protection circuit is mainly to prevent the ECG lead input high voltage from damaging the machine. The maximum and the minimum of the output terminal will not exceed 9V. After connecting the diode to protect the voltage ...

Although LED technology is the mainstream of today's market, there are still many unsolved problems in LED technology, and the life of LED, energy saving, and price ...

Switching power supply, as the power supply equipment of modern electronic products, not only its performance must meet the needs of power supply equipment, but also its own protection measures are also critical. To improve open ...

The circuit has the functions of overcharge protection, overdischarge protection, overcurrent protection and short circuit protection, and its working principle is analyzed as follows:

This article mainly studies the driving and short-circuit protection of IGBT, analyzes its working principle, and designs a driving circuit with overcurrent protection function, ...

In this paper, through the analysis of the working principle of the voltage protection circuit composed of the voltage protection circuit composed of a single junction transistor and thyristor, a method using LM ...

The earliest lithium battery appeared from the great inventor Edison, using the following reaction: Li + MnO2 = LiMnO2 The reaction is oxygen ...

MAX16128 / MAX16129 load-dump / reverse-voltage protection circuit ...

This article mainly introduces the protection circuit of mobile phone battery. When we all use the battery, all kinds of misoperations always occur, and the cell of the mobile phone battery ...

Some loads require more current during startup than during operation; some loads can limit the current to a lower power level during startup, but at work ...

In this production, an infrared safety protection device is designed and manufactured using an infrared radiation detection module, a voice recording and playback module and a bistable trigger.

Function of high-power igbt drive protection circuit

IGBT drive

Electronic enthusiast network: This article mainly records some basic knowledge related to power inverters. Power inverter (vehicle power supply) is a kind of ...

In actual life, accidental accidents due to accidentally touching the metal part of the plug when plugging and unplugging the power plug, to ensure that ...

Rate field effect transistors are widely used due to their many advantages; but their ability to withstand short-term overload is weak, which limits their application. ...

Lead-acid batteries are safe, cheap, and easy to maintain, so they are still widely used in electric bicycles. But lead-acid batteries are polluting, heavy, and ...

With the development of science and technology, the relationship between power electronic equipment and people's work and life is getting closer and closer, and electronic equipment is inseparable from reliable power, so ...

UC3842 is an excellent current control pulse width modulation chip produced by the United States Unltmde company, it has a small number of pins, external ...

Double diode protection circuit:

Red light treatment device water protection circuit:

The following is the two-level protection circuit diagram of the RS485 bus. When a lightning strike occurs, the induced overvoltage is introduced from both ends, and GDT is used for first-level protection.

This paper gives several motor protection schemes. It not only has fast response and reliable control, but also greatly reduces the production cost of the protection device. The protection ...

Protection can also be used to reduce leakage in cable connections. Figure 12 shows the principle of drive protection to prevent the leakage resistance of the cable from affecting the measurement of small currents. in...

The relay triggers the normal movement of the mechanical metal contactor. After contact, the connecting wire plate is actually smaller than before starting. The machine with the surge protector circuit of the opposite protector ...

When the power supply output is overloaded or short-circuited, the Vce value of the IGBT becomes larger, and protective measures can be taken for the circuit according to this principle. It is usually used for this ...

The working principle of the overcurrent detection sensor is shown in Figure 1. The secondary current of the converter obtained by the converter is converted into a voltage by I / V, and the voltage is DC ...

For over-voltage protection control, the specific circuit is shown in Figure 3: The rectifier diode D4 is connected to the over-voltage protection relay JDQ1 output.

When the speaker protection circuit is connected to the audio power, the voltage across the capacitor C3 cannot be abruptly changed, which can be regarded as a short circuit.

The speaker protection circuit is mainly composed of a midpoint potential detection circuit, a delay circuit and a relay.

The normal AC mains power is 220V. It is provided by a phase line L and a neutral line N. If in the maintenance of the power grid or transformer, the other phase wire is mistakenly connected as a neutral wire ...

This protector uses a 230V breakdown voltage protector. And use an effective ground.

A challenge for design engineers is to retain and / or add circuit protection devices that help protect automotive electronic systems from possible overload conditions ...

Although the hearing protector circuit is designed for the MC34119 amplifier, it should be used with similar integrated circuit equipment or applications.

This anti-bounce circuit will maintain the electrical noise generated by the mechanical switch (S1) from reaching the next row of circuits.

In the picture, VH is the drive voltage of 7.2V thermal print head, and the supply of VH is controlled by the normally open relay. Thermal print head overheat protection circuit protects ...

The time that the IGBT withstands the overcurrent is only a few microseconds and the overcurrent resistance is small, so the first thing to pay attention to when using IGBT is how to carry out the IGBT protection circuit ...

The IC regulating valve protection circuit protects the integrated circuit voltage regulator under various faults.

The voltage comparator LM339 is used in the circuit to monitor the power supply voltage. If the voltage at pin 5 is lower than 1.8V, the RAM stops working and B + outputs high power ...

Water enters the motor, and the probe A is submerged. A is connected to the chassis through the water, the relay K is attracted, the normally closed contact is disconnected, the KM is de-energized and released, the motor ...

It can act when the leakage current reaches 30mA: when there is no leakage current, the permanent magnet of the leakage tripping device attracts the armature and is in a normal working state.