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Water Level Alarm by Using D882 Transistor

The water level indicator uses a simple mechanism to detect and indicate the water level in the elevated water tank or any other water container. This paper will introduce the electronic project water level alarm by using D882 transistors.

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Metal Detector Circuit

You can see the presence of metal detectors in many public places such as airports and theaters. They are often for safety reasons to detect if someone is carrying a metal object that does not conform to the regulations. In this project we will design a simple metal detector circuit. There are many kinds of circuits for metal detectors, but most of them are more complicated, so here we use 555 timer to design a simple metal detector circuit.

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STM32 single chip microcomputer controls the circuit of Bluetooth

The Bluetooth module is a PCBA board with integrated Bluetooth function. It is used for short-range wireless communication and is divided into Bluetooth data module and Bluetooth voice module according to functions. The Bluetooth module refers to the basic circuit circuit set of the integrated Bluetooth function, which is used for wireless network communication, and can be roughly divided into three types: a data transmission module remote control module. The general module has semi-finished properties and is processed on a chip basis to make subsequent applications easier.

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The Difference Between Good Bluetooth Headset and Bad Bluetooth headset

As a teenager in the digital world, I am often asked, “Where is a good Bluetooth headset really expensive? Why are there more than a thousand Bluetooth headphones and dozens of Bluetooth headphones? After wearing them, it sounds almost the same! “Their confused faces often make me very confused, so I have to ask them: Otto and Audi are also four wheels, they can all sit and run, why the price is poor?

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How to Choose Wireless Bluetooth Headset

For people who like audio, the emergence of any new technology is full of great attraction. What is the current wireless Bluetooth headset? How should I choose? Every player who really likes audio needs to face the problem. I will take BOSE Soundsport Free, SONY WF1000X and Astrotec S60 as examples to talk about my own experience and feelings, a word for reference only.

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UC3902 Application Circuit

Warm hints: The word in this article is about 1627 and  reading time is about 12 minutes.  
Guidance: There are many parallel connection schemes for DC modules, but there are some drawbacks when they are used in power operation power supply: for example, the current sharing accuracy of output impedance method is too low; neither master-slave setting method nor average current method can realize redundancy technology, so that the reliability of parallel power supply module system can not be guaranteed well; and the independent current sharing method is based on its own characteristics. Performance, such as "high current sharing accuracy, good dynamic response, redundancy technology can be achieved", is increasingly favored by the majority of product developers.
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Charger Principle of Electric Vehicle Based on KA3842

Warm hints: The word in this article is about 1360 and reading time is about 12 minutes.  
Guidance: According to the circuit structure, one of the common electric vehicle chargers is a single-switch power supply driven by KA3842 field effect transistor, which cooperates with LM358 dual op-amp to realize three-stage charging mode. 
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