source:Industry Trends release time:2024-04-18 Hits: Popular:led screen wholesaler
1 AC power indicator light
. As long as the circuit is connected to a 220V/50Hz AC power supply line, the LED will be lit to indicate that the power is on. The resistance value of the current limiting resistor R is 220V/IF.
2 AC switch indicator lights
The circuit uses LED as the indicator light for the incandescent light switch. When the switch is disconnected and the bulb goes out, the current flows through R, LED, and bulb EL to form a circuit, and the LED lights up, making it convenient for people to find the switch in the dark. At this point, the current flowing through the circuit is very small, and the light bulb will not light up. When the switch is turned on, the light bulb is illuminated, and the LED is
Extinguish.
3 AC power socket indicator lights
The circuit uses dual color (common cathode) LED as the indicator light for AC power sockets. The power supply of the socket is controlled by switch S. When the red LED is on, the socket is dead; When the green LED is on, the socket is powered.
4 fuse socket indicator lights
LED is used as a circuit for the fuse socket indicator light in the distribution box of factory equipment. When the safety tube is intact, the LED does not light up; When the fuse is blown, the LED will be lit to indicate to the user which fuse has been blown for replacement. This is very convenient for porcelain core fuses that cannot be observed with the naked eye.
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