It is composed of a magnetic switch circuit, a monostable delay circuit, a lighting control circuit, a ventilating fan control circuit, and a power supply circuit. When the bathroom door is closed, the permanent magnet ZT is close to the normally closed reed switch AG. Due to the magnetic force of the ZT, the intra-AG contact is broken, and the triode VT is turned off without biasing. At this time, the time base integrated circuit IC1 The 2 pin is high level, so IC1 is in the reset state, the 3 pin of IC1 outputs the low level, the relay J has no current, and the ventilation fan and the illumination lamp are in the power-off state. Once someone enters the bathroom, the distance between ZT and AG will increase at the moment of entering the door, and the magnetic line of ZT will not act on the AG. Therefore, the two contacts in the AG are reset and contacted. At this time, the triode is biased and turned on. After VT is turned on, the pin 2 of IC1 is changed to low level (only the saturation voltage drop value of VT), and the IC trigger is set. At this time, the 3 pin of IC1 jumps from the original low level to the high level, and the relay J excitation pull. After J is sucked, its normally open contact J1-1 is closed, and the ventilating fan M is energized to start exhausting. At the same time, another set of normally open contacts J1-2 of J is also closed, the illumination lamp H is energized, and its height can be adjusted by the RP.
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If it is daytime, because there is strong light on the photoresistor CdS, so that the internal resistance of CdS is small, the voltage across the phase shifting capacitor C6 is not enough to make the trigger diode 2ST turn on, so the VS has no trigger current and is blocked. , the illumination H will not light up. At night, since there is no sunlight on the CdS, the internal resistance of the CdS becomes very large, which is equivalent to an open circuit. At this time, 2ST is turned on, VS is turned on, and the illumination lamp H is lit.
After opening the door and entering the bathroom, although the door is closed again, the circuit is still in the state of ventilation and illumination (night) due to the monostable effect of IC1. When the door is opened, the ZT is kept away from the AG, and then the door is closed again, causing the ZT to be close to the AG. After a delay, the lamp and the ventilation fan will automatically stop working. In order to ensure that the door is normally closed, it is necessary to place a tension spring outside the door or to use a loose leaf with a torsion spring, so that the door is automatically closed after the door is closed to ensure that the ZT and the AG are close together. The device is stepped down by capacitor C5, and is filtered by C4 after full-bridge U rectification. VDW is regulated and supplied to the circuit DC power supply.