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Specification: MOSFET is an electronic devices with good switching characteristics. It is widely used in circuits£¬ such as power supplies switching £¬motor drives£¬ lighting dimmer and so on. Relay is another kind of module with switching characteristics. Since relay works relying on mechanical contacts to open or shut. In this way it s will inevitably lead to relay's stopping working while switching time is too short. And papa sound made by relay in some situations is annoying. We designed a 4-channel MOSFET switch. It can supply up to four groups of electronic switches to control different circuit blocks respectively. Limited by the working principles£¬ MOSFET can only be used to control the DC circuit£¬ such as DC-LED screen and so on£¬ but not suitable for AC circuit control. In some extreme cases£¬It can be used to control 100V/33A DC circuit. However£¬ it is suggested that the controlled DC voltage is more than 9V. The circuit is connected at one end of the wire is slightly controlled some trouble. To control a 12V LED lights£¬ for example£¬ First£¬ the positive (+) and negative (-) between the connected power Then connect the positive LED lights with the module connected to the positive (+)£¬ LED lights with the anode connected to the switch 1 (S1) on. If there are other LED lights with the need to control£¬ just the same cathode lights with LED module is connected to the positive (+)£¬ LED lights with the negative electrode in turn is connected to the switch 2 (S2)£¬ switch 3 (S3)£¬ the switch 4 (S4) on; Connection control side is much simpler£¬ we only need a sensor cable£¬ the corresponding control port Arduino sensor expansion board connected£¬ you can control the 12V LED lights brought by Arduino.