Multipurpose delay switch power socket

[url=../Upload/2005527205047210.jpg] Turning on or off the power of household appliances, lighting lamps, etc. often needs to be done after different time delays. This power socket can meet these different needs. Working principle: The circuit is as shown in the figure. It consists of voltage reduction, rectification, filtering and delay control circuits. Press AN, and the 12V working voltage is applied to the delayer. At this time, the ② and ⑥ pins of NE555 are high level, and the ③ pin output of NE555 is low level, so the relay K is powered to work, and the contact K1-1 When it is pulled upward, the "delayed off" socket has power, but the "delayed open" socket has no power. At this time, the power supply charges C3 through the capacitor C3, potentiometer RP, and resistor R3 to "ground". As the voltage on C3 increases, the voltage of the ② and ⑥ pins of the NE555 decreases more and more. When this voltage When it drops to 2/3Vcc, the ③ pin output of NE555 jumps from low level to high level. At this time, the relay will lose power and will not work. Then its control contact will return to its original position, and the "delayed shutdown" socket will lose power. , and the "delayed" socket gets power. In this way, different needs are met, and LED and LED2 provide corresponding instructions. As long as the components of this circuit are good and the assembly is correct, it will work normally after installation. The delay time is determined by the values ​​of C3 and PR+R3, T≈1.1C3(PR+R3). RP refers to the effective part. C3 can use capacitors ranging from tens of pF to 1000μF, and the value of (PR+R3) can be 2K~10MΩ. The withstand voltage value of C1 should be ≥400V, the power of R1 should be ≥2W, the AN button switch can be of K-18 type, and the relay model is JQX-13F-12V. There are no special requirements for other components.