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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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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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DIY Smartphone Anti-burglary Alarm by Yourself

This simple to-construct and-use cell phone hostile to robbery alert is a ultra-straightforward security gadget that appends a security link from a cell phone to an item, hence discouraging the potential burglary of a cell phone in open regions, for example, air terminals, railroad stations, and cafeterias. Since the gliding end of the security link has a standard smaller scale USB connector, you can undoubtedly append it to the USB in a hurry (OTG) port of your cell phone in the wake of circling the security link around a table/seat leg to keep the cell phone set up. At whatever point somebody attempts to withdraw the security link from the cell phone, the cell phone hostile to robbery caution gadget, bolted to a similar leg, alarms you quickly with a thundering cautioning signal!

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