Delay start switch circuit diagram

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

MOS power IC full range

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Delay start switch circuit

If the power switch S is not connected, due to the delay of the RC, at the beginning, the 3 and 4 pins of the 5S module are at a high level, the internal circuit of the module is turned off, and the relay J is in a released state, due to the action of the diode. The voltage across the bulb H is only 0.45 times the rated voltage (220V), which is 99V. This greatly reduces the inrush current when the lamp is turned on due to the low lamp filament resistance, that is, the low-pressure preheating (increasing the filament filament resistance). After a period of time, C is charged by R. The 5S and 4 pin voltages of the 5S are getting lower and lower, and finally the internal circuit working state of the module is reversed. The relay is closed, its normally open contact is closed, and the diode VD is shorted, so that the bulb H obtains full voltage (220V) operation. . This will extend the life of the lamp. The 5S module delay on time is calculated by 1.1RC. Relay J should be AC ​​type. This circuit is suitable for incandescent clusters, such as street lights, corridor lights, etc.