Ultra-low cost isolated AC voltage detection + brownout detection two-in-one circuit

Recently, a Supor electric pressure cooker was repaired. The fault is that the starting resistor of the AC-DC chip of the switching power supply board is open internally, resulting in no voltage output and no work. A detection circuit used in it is very characteristic, and I put it up for everyone to see. I thought it was just a simple power-down detection circuit, but it can actually detect the negative voltage of the flyback transformer to judge the input voltage of the flyback.
2022-03-11 10:34:04277

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Explore how the main circuit of the inverter is powered on for maintenance

Explore how the main circuit of the inverter is powered on for maintenance
2021-12-25 10:41:248

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Photoelectric instrument detection circuit diagram download

Photoelectric instrument detection circuit diagram download
2021-11-04 15:08:402

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Precision overvoltage detection circuit OZ8800 for secondary battery protection

Precision overvoltage detection circuit OZ8800 for secondary battery protection
2021-08-17 14:19:488

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Inspection before power-on of the circuit board and power-on testing and debugging data download

Electronic Enthusiast Network provides you with electronic data downloads for circuit board inspection before power-on and power-on detection and debugging data download, as well as other related circuit diagrams, source codes, courseware tutorials, Chinese materials, English materials, reference designs, user guides, solutions Program and other information, I hope to help the majority of electronic engineers.
2021-03-30 08:42:4217

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LTC2066/LT1389 Demonstration Circuit – Precision Ultra Low Power High Side Current Sensing

LTC2066/LT1389 Demonstration Circuit – Precision Ultra Low Power High Side Current Sensing
2021-03-23 14:02:138

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Electric Field and Leakage Detector Circuit Schematic Free Download

The main content of this document is the free download of the electric field and leakage detector circuit schematics.
2021-03-19 16:41:3517

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ECG detection preamplifier circuit

This circuit is a human ECG detection circuit composed of ISO122 and INA115, which can fully meet the requirements of medical equipment, that is, input impedance, small leakage current, high detection accuracy and human safety.
2021-03-16 15:46:020

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Structure analysis of smoke detector based on photoelectric principle smoke sensor

The main sensors in the smoke chamber include two: one is the emission light source, and the other is the photoelectric detection. There are special shading posts between them.
2020-09-26 07:42:534036

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Performance characteristics and application of high-voltage zero-drift precision amplifier OPA734/5

The 12V high-voltage zero-drift amplifiers OPA734 and OPA735 introduced by TI are very suitable for high-precision and power-sensitive places that require stability over temperature and time. Target applications include temperature measurement, medical instrumentation, precision stress gauges, hand-held test instruments, electronic scales, automotive electronic systems, and battery-powered instrumentation.
2021-01-11 01:33:01422

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Design of photoelectric control system based on single chip technology and photoelectric detection technology

Lidar, anti-laser guided weapon systems, etc. have all used this technology. At the same time, in some special industrial industries, such as optical fiber communication, precision measurement, precision manufacturing, parts inspection, etc., optoelectronic technology has been applied to different degrees in its production technology.
2021-01-04 10:15:512261

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Performance Characteristics and Application Range of OPA627 Differential Operational Amplifier

The OPA627 differential op amp offers a new level of performance in precision FET op amps. Compared to the popular OPA111 op amp, the OPA627 has lower noise, lower offset voltage and higher speed. The OPA627 is useful in a wide range of precision and high-speed analog circuits.
2020-10-27 10:38:0611045

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Analysis of Measurement Circuit Constituted by ISO102 and OPA27

As shown in the figure is a circuit composed of ISO102 and OPA27 to measure the current of a 500VDV DC motor. The circuit connects a sampling resistor in series between the +500V DC voltage source and the DC motor to detect the voltage drop on the sampling resistor to detect the motor current change. This sampling voltage is input to the operational amplifier OPA27 for amplification, and then isolated and amplified by the IS0102 and output.
2019-07-24 20:56:021086

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How to use the leakage detector_How to use the leakage detector

The leakage detector can detect the operating current of the current-type electric shock protector and detect the unbalanced leakage current less than the action of the current-type electric shock protector, and can also distinguish the leakage voltage that is harmful to the human body and the induced voltage that is harmless to the human body. It can effectively detect the leakage phenomenon of electrical appliances.
2019-09-05 11:18:0014796

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AD9826 and AD9822 chip and photoelectric detection PD driver board circuit diagram and PCB data free download

The main content of this document describes in detail the AD9826 and AD9822 chips and the photoelectric detection PD driver board circuit diagram and PCB data for free download, 3-channel PD laser detector and its receiving circuit; The received signal is input to AD9826/AD9822 to achieve A/ D
2019-05-22 11:33:5341

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Photoelectric detection control circuit manual PDF e-book free download

With the development of science and technology, automation technology has been widely used in industrial production and modernized national economic construction. use. The photoelectric detection control circuit is one of the core technologies of the automation system, which is difficult to replace by other circuits. Its stability and accuracy determine the stability and control accuracy of the automation process
2019-04-07 20:15:0222

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Precision current inverter/current source circuit composed of LOG101/104 and operational amplifier OPA2335

Usually the input current can only flow into 1 feet and 8 feet, and the fine is 10nA ~ 1mA. In some applications, the signal current is a negative current, such as photomultiplier. tube, photodiode, etc. The circuit in the figure can solve this problem. It uses the additional circuit in the figure to convert the negative signal current generated by the photodiode into the positive current flowing into the LOG101. As shown in the figure is a precision current inverter/current source composed of LOG101 and operational amplifier OPA2335
2020-10-06 23:33:02260

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Fact Sheet for Photodetectors and Basic Components of Photonics

The main content of this document describes in detail the data description of the photodetector and the basic components of photonics. The main content includes: 1. The performance parameters of the photodetector, 2. The type of the photoelectric detector, 3. The multi-channel detector – self-study, 4. Optical basic components, 5. Optical basic components, 6. Spectroscopic components
2019-01-17 21:25:0623

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Photovoltaic photoelectric detection circuit diagram (detailed explanation of four analog circuit design schematics)

This paper mainly introduces the complete circuit diagram of photovoltaic photoelectric detection (detailed explanation of four analog circuit design schematic diagrams). The signal received by the photodetector is generally very weak, and the signal output by the photodetector is often buried deep in the noise. Therefore, to process such a weak signal, it is generally necessary to
2018-02-06 15:00:2126190

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EM78P447 self-transceive photoelectric detection program

Self-transmitting photoelectric detection.dt ;**** PORT5 == 0x05 ; define ports 5, 6, 7 PORT6 == 0x06 PORT7 == 0x07
2018-01-30 18:18:061785

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MCU power failure detection and storage

This article mainly introduces the method of detecting and saving the power failure of the single-chip microcomputer. When the single-chip microcomputer is working normally, the data in the data memory (RAM) will be lost due to a sudden power failure for some reason. The Farad capacitor can easily realize the power-down detection and data storage of the single-chip microcomputer.
2018-01-14 11:56:573763

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A method of voltage detection based on TL431 simple circuit

This paper mainly introduces the method of realizing voltage detection based on TL431 simple circuit, using tl431, PNP and NPN transistors to design a power-down detection circuit, which can completely replace the power-down detection function of MAX708, is stable and reliable, and can be applied to other circuit detection.
2017-12-14 09:34:5160210

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The composition of the photoelectric detection circuit and the design of the weak optical signal preamplifier circuit in the system

In principle, photoelectric detection technology can detect all non-electrical quantities that can affect the amount of light and light characteristics. It can convert the non-electrical information to be detected into optical information that is easy to accept through the optical system, and then use the photoelectric detection device to convert the optical information into electric quantity, which is further amplified and processed by the circuit.
2017-11-08 11:35:0528

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Noise Analysis and Circuit Design of Photoelectric Detection in Optical Fiber Sensing Technology

Photoelectric detection and signal preprocessing are very important to optical fiber sensing system. A low distortion and low noise photoelectric detection amplifier circuit is designed for this situation, and a demodulation circuit based on fiber grating is proposed. On the basis of theoretical analysis, photoelectric detection experiments are carried out on multi-point fiber gratings, and the experimental data show that the designed
2017-11-04 10:56:5829

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Analysis of Laser Photoelectric Detection Technology

The content describes the basis of laser principle, laser interferometry, laser diffraction measurement, laser holographic interferometry, optical fiber sensing detection technology and other photoelectric detection methods.
2017-09-01 14:34:3110

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Intelligent photoelectric detection technology research and circuit design_Wang Ligang

Intelligent photoelectric detection technology research and circuit design_Wang Ligang
2017-01-22 12:58:131

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A Practical Power-Down Detection and Protection Circuit

A Practical Power-Down Detection and Protection Circuit
2017-01-20 12:52:4835

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Precision photoelectric detection circuit design scheme

Precision photoelectric detection circuit design scheme
2016-12-11 19:57:2553

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Iphone7 mobile phone charging detection example

The author of this article uses a professional power measuring instrument to test the charging process of the entire iphone7 mobile phone, in order to analyze the overall test performance of the Iphone mobile phone.
2016-11-23 17:14:124554

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Design of Weak Photoelectric Signal Detection Circuit

Design of Weak Photoelectric Signal Detection Circuit
2016-10-13 08:54:1823

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Photoelectric Detection Technology in Optical Storage

Learning tutorial materials in the development of single-chip microcomputers for electronics majors – photoelectric detection technology in optical storage
2016-08-02 16:19:3218

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Photoelectric detection technology and application experiment report

Photoelectric detection technology and application experimental report, educational course requirements, experimental guidance
2016-07-01 14:45:095

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Electromagnetic Compatibility Design of Transformer Partial Discharge Detection System

Electromagnetic compatibility design of transformer partial discharge detection system, interested students can download and study
2016-03-31 20:48:5413

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OPA602 High Speed ​​Precision Difet(R) Operational Amplifier

OPA602:High-Speed ​​Precision Difet(R) Operational Amplifier
2015-11-30 21:52:3534

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Photoelectric detection circuit and signal processing

Design amplifier circuit can refer to, PIN photoelectric detection circuit pre-amplifier, intermediate amplifier, filter circuit
2015-11-19 10:44:2313

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Circuit diagram of charge amplifier composed of OPA128

Circuit diagram of charge amplifier composed of OPA128
2014-06-18 10:59:0527657

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The rapid rise of domestic LED photoelectric detection equipment enterprises

With the rapid development of the semiconductor lighting industry in recent years, the continuous expansion of application fields and the rapid improvement of production automation requirements, the field of related photoelectric detection equipment has also become a hot spot for enterprise investment layout. LED photoelectric detection equipment products and technologies continue to enrich
2012-10-31 10:15:531774

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Photoelectric detection equipment for LED production has become the main driving force

LED photoelectric detection equipment is widely used in the research and development of various LED products, the quality control of the production process and the photoelectric performance inspection of end products, which plays an important role in escorting the healthy and rapid development of the LED industry. With the development of semiconductor lighting industry in recent years
2012-07-25 16:12:011021

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Design of Detection Circuit of Laser Heterodyne Glass Thickness Measurement System

The measurement principle of laser heterodyne glass thickness measurement system is introduced, and the photoelectric detection circuit suitable for this system is designed by analyzing the performance characteristics of several photoelectric detection circuits, which provides a unit module circuit for laser heterodyne detection.
2012-05-09 16:13:4463

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The working principle and design scheme of photodiode detection circuit

Photodiodes and their associated preamplifiers are the bridge between fundamental physical and electronic quantities. Many precision applications need to detect light levels and convert them into useful digital signals. Light detection circuits can be used in CT scanners, blood analyzers, smoke detectors
2012-03-05 11:19:3456712

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Design of PIN photoelectric detection circuit for weak light signal

With the development of science and technology, photoelectric detection technology has been widely used in many fields such as military, industry, agriculture, space, environmental science, medical care and civil use. It has the characteristics of long-distance, non-contact, fast, high-sensitivity detection and transmission.
2011-09-14 16:32:43121

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Noise Analysis and Circuit Design Based on Photodiode Detection Circuit

Using the theoretical formulas of noise and signal-to-noise ratio and the equivalent circuit model, the causes of noise in the photodiode detection circuit are analyzed. The design principle of low-noise photoelectric detection circuit is given, and the low-noise preamplifier circuit based on photodiode is designed. the result shows
2011-09-14 16:31:20138

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Design of Smoke Sensing Alarm Circuit with Emergency Lighting Function

The system adopts MSP430 microcontroller as the main control core, and applies mature photoelectric detection circuit to monitor smoke. The emergency lighting adopts the method of both mains detection and photoelectric detection. Compared with previous discrete systems, this system has simplified wiring, high reliability, and
2011-08-22 16:28:441281

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Design of Sludge Density Detector Based on Photoelectric Detection

The detector adopts photoelectric method to detect the distribution and density of underwater sludge, and has the characteristics of small size, low power consumption, strong safety and high accuracy. It can distinguish silt of different densities, and the disturbance to the silt is also small.
2011-06-16 09:52:151078

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MAX14578AE/MAX14578E USB Battery Charge Detectors

The MAX14578E/MAX14578AE are USB chargers with USB battery charge detection compatible with version 1.1. The USB charger detection circuit detects the USB standard of the downstream port
2011-04-14 18:00:041321

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Noise Analysis of Photodiode Detection Circuit

Abstract: Using the theoretical formulas of noise and signal-to-noise ratio and the equivalent circuit model, the causes of noise in photodiode detection circuits are analyzed. The design principle of low-noise photoelectric detection circuit is given, and the low-noise preamplifier circuit based on photodiode is designed. The results show that the noise of the photodiode is mainly caused by the internal resistance of the light conversion device and the random fluctuation of carriers in the PN junction
2011-03-14 15:25:09395

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PIN weak light signal detection circuit

This paper analyzes the working principle of the photoelectric detection circuit of PIN tube, analyzes the noise of several circuit forms, and proposes a method to reduce the noise and improve the signal-to-noise ratio. Keywords PIN photodiode bias current thermal noise signal-to-noise ratio detection circuit With the development of science and technology, photoelectric detection technology has been widely used in military, industry, agriculture, space, environmental science, medical and health
2011-03-14 15:23:48363

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Design of infrared light signal receiving circuit based on photoelectric detection

Due to the wide application of infrared devices, the detection of infrared light signals has attracted the attention of many scholars. In order to solve the problem that infrared light signal is easily interfered by sunlight, based on the principle of photoelectric detection, according to the characteristics of infrared light signal and noise, a preconditioning circuit for infrared light signal detection is designed. The weak optical signal is converted into an electrical signal by a phototransistor, and passed through
2011-02-12 16:04:16202

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Design of Laser Power Detection System Based on AD7705 and Photoelectric Detection Technology

1 Introduction An on-line laser is designed by using single chip microcomputer and AD7705 analog-to-digital converter combined with photoelectric detection technology
2010-10-30 11:15:182544

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Ground wire live detection circuit

The utility model relates to a ground wire electrification detection circuit, which relates to a ground wire electrification detection interface of a voltage-limiting time base circuit of an electric water heater control chip, which belongs to the application field of detection technology. Including the ground wire live detection circuit. its characteristics
2010-10-17 09:16:345086

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Schematic diagram of ECG detection circuit

The following is a brief introduction to the common type of ECG detection circuit, as shown in the figure: Figure: Ordinary type of ECG detection circuit
2010-09-25 11:02:307997

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Introduction of photoelectric detection technology

(1) Detection 1. Detection is to distinguish whether the measured parameter quantity belongs to a certain range band through a certain physical method, so as to judge whether the measured parameter is qualified or whether the parameter quantity exists. When measuring, the unknown quantity to be measured is compared with the one of the same nature.
2010-08-20 09:36:271398

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Photoelectric detection circuit diagram

The picture shows the photoelectric detection circuit. The detection circuit is composed of amplifier A, feedback resistors RF and CF, and its output voltage is u1=SPRF, where S is the sensitivity of the photodiode, and P is the incident light power. When detecting weak light signals, RF increases the gain, and the RF
2010-08-09 10:28:133315

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Photoelectric detection circuit schematic

For convenience, R2 and R3 in the circuit are RT and RF in the previous equivalent circuit model. The front-end part is composed of photoelectric conversion diode and pre-amplifier, which is also the core part of the photoelectric detection circuit. The device uses high-performance low-noise operational amplifier.
2010-07-31 09:49:164339

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Photoelectric Detection System Using Weak Optical Signal Preamplifier Circuit

In principle, photoelectric detection technology can detect all non-electrical quantities that can affect the amount of light and light characteristics. It can convert the non-electrical information to be detected into optical information that is easy to accept through the optical system, and then use the photoelectric detection device
2010-07-31 09:46:392343

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Photoelectric detection technology courseware (high-quality course teaching plan)

The main contents of photoelectric detection technology courseware, excellent courses, and photoelectric detection technology lesson plans are as follows: Chapter 1 Introduction Section 1 Section 2-3 Chapter 2 Basic Principles of Optical Detection Chapter 3 Precision Theory of Photoelectric Detection Instruments
2010-06-16 10:51:24239

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Electrostatic detection circuit diagram composed of LM324

Electrostatic detection circuit diagram composed of LM324
2010-03-30 16:03:097414

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Research on Photoelectric Detection Method of Vehicle Wheelset Tread Defects

Photoelectric detection method for wheelset tread defects of railway vehicles The abrasion and peeling of the wheelset tread of railway vehicles is a common irregular surface defect formed during the operation of the vehicle, and it is a must be detected in the process of wheelset maintenance.
2010-02-22 11:46:559

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Research on photoelectric detection based on single chip technology

Assistant Hu, An Wenyuan, Li Ling, Ouyang Xiaodong Keywords: single chip microcomputer, laser, photoelectric detection, pulse signal Abstract: At present, photoelectric detection technology has been widely used in high-tech military
2010-02-07 16:40:27103

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Photoelectric Position Detection Circuit Using Power Frequency Wave as Code

The photoelectric position detection circuit using the power frequency wave as the code In the traditional AC power supply electrical products, when it is necessary to use the photoelectric tube to detect the position of the workpiece or parts, in order to filter out the interference of the ambient light, it is usually used.
2010-01-21 10:20:04713

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Precision current source circuit composed of AD586

The precision current source circuit composed of AD586 is a precision current source composed of AD586.
2009-10-24 15:30:261465

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A circuit using an op amp to provide a precision reference voltage

Circuit diagram 1-38 of the circuit composed of op amps to provide precision reference voltage is the circuit diagram composed of op amps
2009-10-13 15:03:131076

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How to judge the quality of photoelectric components with self-made photodetector

How to use a self-made photodetector to judge the quality of photoelectric components Another way to judge the quality of a photodiode is to make a self-made photodetector. The circuit is shown in Fig. photodiodes though
2009-08-03 16:21:23793

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Protection circuit diagram using optocoupler

Protection circuit diagram using optocoupler
2009-07-17 14:39:57911

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Design of Photoelectric Detection System for Weak Light Signal

The components of the photoelectric detection system are analyzed in detail, and the application of the A/D converter AD7714 chip in the photoelectric detection system is expounded. Finally, the interface circuit diagram, program flow chart and key subroutines of AD7714 and AT89C52 are given. Photoelectric detection technology
2009-07-15 10:06:59144

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Circuit Diagram of Precision DC Spot Level Detector

Circuit Diagram of Precision DC Spot Level Detector
2009-07-02 11:45:37422

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Low level photoelectric detection circuit diagram

Low level photoelectric detection circuit diagram
2009-06-26 15:49:43828

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OPA404 photosensitive detection circuit diagram

OPA404 photosensitive detection circuit diagram
2009-06-26 15:15:19640

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OPA604 piezoelectric sensor detection circuit diagram

OPA604 piezoelectric sensor detection circuit diagram
2009-06-25 10:47:421169

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OPA128 circuit functional block diagram

OPA128 circuit functional block diagram
2009-06-25 10:45:272152

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OPA128 pressure sensor detection circuit diagram

OPA128 pressure sensor detection circuit diagram
2009-06-25 10:44:471613

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OPA128 sensor displacement current-voltage converter circuit diagram

OPA128 sensor displacement current-voltage converter circuit diagram
2009-06-25 10:43:441018

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OPA128 PH value detection circuit diagram

OPA128 PH value detection circuit diagram
2009-06-25 10:43:083152

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OPA111 Piezoelectric Sensor Detection Circuit Diagram

OPA111 Piezoelectric Sensor Detection Circuit Diagram
2009-06-25 10:42:131820

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OPA111 light detection circuit diagram

OPA111 light detection circuit diagram
2009-06-25 10:41:11603

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OPA111 PH value detection circuit diagram

OPA111 PH value detection circuit diagram
2009-06-25 10:39:302121

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OPA27 OPA37 Underwater Acoustic Sensing Detection Circuit Diagram

OPA27 OPA37 Underwater Acoustic Sensing Detection Circuit Diagram
2009-06-25 10:38:48709

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OPA27 OPA37 Balanced Pyroelectric Infrared Detector Circuit Diagram

OPA27 OPA37 Balanced Pyroelectric Infrared Detector Circuit Diagram
2009-06-25 10:38:17934

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OPA27 OPA37 Tape Head Detection Circuit Diagram

OPA27 OPA37 Tape Head Detection Circuit Diagram
2009-06-25 10:37:05840

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OPA27 OPA37 Long Wave Infrared Detection Circuit Diagram

OPA27 OPA37 Long Wave Infrared Detection Circuit Diagram
2009-06-25 10:35:52921

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Application of photoelectric technology in smoke machine detection

Various applications of various photoelectric detection devices in related equipment in tobacco industry are introduced, including CCD (charge coupled device), photocell, infrared receiving transistor, infrared filter and color mark sensor, and their working principle is briefly described.
2009-06-24 10:24:3914

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Movement direction photoelectric detection circuit diagram

Movement direction photoelectric detection circuit diagram
2009-06-06 10:09:29582

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Circuit diagram of electrical leakage detection alarm socket for household appliances

Circuit diagram of electrical leakage detection alarm socket for household appliances
2009-05-20 14:03:33672

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Electric product leakage detection voice alarm socket circuit diagram

Electric product leakage detection voice alarm socket circuit diagram
2009-05-20 13:57:51567

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Photoelectric detection circuit

Photoelectric detection circuit 1 Training purpose (1) Master the use of common instruments. (2) Proficiency in the testing and judgment of diodes, transistors, relays, operational amplifiers and other devices, as well as the reference and application of parameters
2009-04-24 09:07:162933

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Circuit Design of Weak Light Detection

The weak light detection circuit is designed with MAX4008 photodetector, ADOP297 precision operational amplifier and 30Hz low-pass active filter circuit to form a weak light detection circuit.
2009-04-22 20:40:231015

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Dimming photodetector circuit diagram

Dimming photodetector circuit diagram
2009-04-20 11:19:37686

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Circuit and fabrication of leakage detection socket device

Circuit and fabrication of leakage detection socket device
2009-04-14 14:34:0315

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Power failure detector circuit diagram

Power failure detector circuit diagram
2009-04-09 09:17:291027

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Precision Photodiode Comparator Circuit Diagram

Precision Photodiode Comparator Circuit Diagram
2009-04-02 09:02:221271

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Circuit Diagram of Precision Photodiode Light Intensity Detector

Circuit Diagram of Precision Photodiode Light Intensity Detector
2009-04-01 09:24:492298

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Design and Research of Photoelectric Detection and Control System Based on EDA

Research and Design of Photoelectric Examination Control System Based on EDA
2009-03-16 16:44:5423

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Photometric circuit diagram using Pbs PbSe

Photometric circuit diagram using Pbs PbSe
2008-12-24 21:58:31879

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50MHZ photoelectric detection circuit diagram

50MHZ photoelectric detection circuit diagram
2008-12-24 15:08:15950

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OPA128 pdf datasheet (Difet El

The OPA128 is an ultra-low bias current monolithicoperational amplifier. Using advanced
2008-12-18 19:46:3023

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OPA502 application circuit

OPA502 application circuit
2008-12-17 01:38:35942

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Photosensitive tube detection circuit (sensor OPA404 high-speed isolation operational amplifier circuit)

Photosensitive tube detection circuit: sensor OPA404 high-speed isolation operational amplifier circuit
2008-05-15 09:43:47843

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Sensor OPA128 Dielectric Isolation FET Input Operational Amplifier Circuit

Sensor OPA128 Dielectric Isolation FET Input Operational Amplifier Circuit
2008-03-01 00:41:571136

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Photodetector circuit diagram

The photodetector circuit diagram is composed of CD4011 and triode 9013, which is very convenient for testing.
2007-12-20 20:44:05797

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Simple leakage detector

Simple leakage detector
2007-12-19 20:31:10693

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