It is generally understood that a sensor converts a physical quantity through a circuit into a description that can be expressed in another intuitively expressible physical quantity, so there are a few points to note:
1. Generally, the measured physical quantity is very small, and usually has conversion noise inherent to the physical conversion element of the sensor. For example, the signal strength of the sensor at 1 magnification is 0.1~1uV, and the background noise signal at this time has such a large level, even annihilating it. How to take out the useful signal as much as possible and reduce the noise is the primary problem in sensor design.
2, the sensor circuit must be simple and refined. Imagine an amplifying loop with a 2-stage active filter with a 2-stage active filter that amplifies the signal and amplifies the noise. If the noise does not significantly deviate from the spectrum of the wanted signal, the filter is amplified at the same time. The signal to noise ratio has not improved. Therefore, the sensor circuit must be refined and simple. To save 1 resistor or capacitor, you must remove it. This is a problem that many engineers who design sensors are easy to ignore. It is known that the sensor circuit is troubled by the problem of noise, and the more complicated the circuit is modified, the more complicated it becomes.
3. Power consumption issues. The sensor is usually at the front end of the subsequent circuit and may require a long lead connection. When the sensor consumes a lot of power, the connection of the leads will introduce all the unnecessary noise and power supply noise, making subsequent circuits more difficult to design. In the case of sufficient use, how to reduce power consumption is also a small test.
4. Selection of components and power supply circuit. The selection of components must be sufficient, as long as the device specifications are within the required range, and the rest is the circuit design problem. The power supply is a difficult problem in the sensor circuit design process. Don't pursue the power supply index that cannot be achieved. Choose an op amp with a good common mode rejection ratio. Use a differential amplifier circuit to design the most common switching power supply. The device will meet your requirements. The retreat of the power supply must be designed reliably and follow the requirements of the device manual.
Function description
The socket is ordinary converter,with two output 5V2A power USB power supply at the same time,can be very convenient in use electrical appliances and recharge the equipment at the same time,such as digital products like Iphone Ipad,MP3,MP4 etc.The charge apply to full range of international AC output,no-load power consumption less than 0.3W,with short circuit,overload,over-voltage protection,can be convenient for your life and save more energy
Timer Control Time Adgustment
1.Press the power switch 1 time,the 1HOUR LED will light on.The Timer into ON mode,USB and control socket output ON .
2.Continuously press the power switch the LED light on,the Countdown mode and LED light on will cycle change from 1HR,2HR,4HR,6HR,8HR,10HR.
3.Choose you need countdown time mode,the mode LED will lighto on,start countdown until countdown time finish,the control output and USB change to OFF
4.Then the countdown is start,The Time indicate LED will from high to low auto change until Countdown finish off.
Failure analysis:
1.check whether the power supply connection is good
2.check whether the USB cable is loosen
Warning Note:
1.Use indoor and dry location ONLY
2.The load max does not exceed 15A 3600W
3.This product does not convert voltage please do not miss use DO NOT exceed the maximum loading of 3600 Watts 15A
4.Always have earth connection for safety reason
5.If in doubt please consult with a qualified electrician
USB charger socket, USB socket, USB plug, USB plug socket
NINGBO COWELL ELECTRONICS & TECHNOLOGY CO., LTD , https://www.cowellsocket.com