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当湿度变化时，会引起RS阻值的变化
220V交流市电通过T降压、VD1～VD4整流、C1和C2滤波以及IC1稳压后，得到9V的直流电压，为电路供电，VL3为电源指示灯。
After T-buck, VD1-VD4 rectifier, C1 and C2 filter and IC1 voltage stabilization, 220V AC power supply can get 9V DC voltage, which supplies power for circuit and VL3 is power indicator lamp.
由IC1及R1、R2和C3构成一个振荡电路，产生频率为2.5KHz左右的脉冲信号，该信号经过RP1、RS分压和VD5整流后，通过R3加至V3的基极。
An oscillating circuit consisting of IC1 and R1, R2 and C3 generates a pulse signal with a frequency of about 2.5KHz. After RP1, RS voltage divider and VD5 rectifier, the signal is added to the base of V 3 through R3.
当湿度变化时，会引起RS阻值的变化。
When the humidity changes, the RS resistance will change.
●当湿度减小时，RS阻值增大，使V3的基极电位上升而导通，进而使V1和V2导通、V4截止，继电器KA1吸合，驱动加湿设备工作，同时加湿指示VL1点亮；
When the humidity decreases, the RS resistance increases, which makes the base potential of V3 rise and turn on, and then makes V1 and V2 turn on and V4 cut off. The relay KA1 absorbs and drives the humidifying equipment to work, and the humidifying indicator VL1 lights up.
●当湿度增大时，RS阻值减小，使V3的基极电位下降而截止，进而使V4导通、V1截止，继电器KA2吸合，驱动干燥设备工作，同时干燥指示VL2点亮。
When the humidity increases, the RS resistance decreases, the base potential of V3 decreases and cuts off, then V4 turns on and V1 cuts off. The relay KA2 absorbs and drives the drying equipment to work. At the same time, the drying indicator VL2 lights up.
这样就克保证环境湿度控制在设定的数值，环境湿度由RP1来进行设定。同时，调整RP2和RP3，可对V1、V2和V3的工作灵敏度进行调节。
This ensures that the ambient humidity is controlled at the set value, and the ambient humidity is set by RP1. At the same time, the working sensitivity of V1, V2 and V3 can be adjusted by adjusting RP2 and RP3.
After T-buck, VD1-VD4 rectifier, C1 and C2 filter and IC1 voltage stabilization, 220V AC power supply can get 9V DC voltage, which supplies power for circuit and VL3 is power indicator lamp.
由IC1及R1、R2和C3构成一个振荡电路，产生频率为2.5KHz左右的脉冲信号，该信号经过RP1、RS分压和VD5整流后，通过R3加至V3的基极。
An oscillating circuit consisting of IC1 and R1, R2 and C3 generates a pulse signal with a frequency of about 2.5KHz. After RP1, RS voltage divider and VD5 rectifier, the signal is added to the base of V 3 through R3.
当湿度变化时，会引起RS阻值的变化。
When the humidity changes, the RS resistance will change.
●当湿度减小时，RS阻值增大，使V3的基极电位上升而导通，进而使V1和V2导通、V4截止，继电器KA1吸合，驱动加湿设备工作，同时加湿指示VL1点亮；
When the humidity decreases, the RS resistance increases, which makes the base potential of V3 rise and turn on, and then makes V1 and V2 turn on and V4 cut off. The relay KA1 absorbs and drives the humidifying equipment to work, and the humidifying indicator VL1 lights up.
●当湿度增大时，RS阻值减小，使V3的基极电位下降而截止，进而使V4导通、V1截止，继电器KA2吸合，驱动干燥设备工作，同时干燥指示VL2点亮。
When the humidity increases, the RS resistance decreases, the base potential of V3 decreases and cuts off, then V4 turns on and V1 cuts off. The relay KA2 absorbs and drives the drying equipment to work. At the same time, the drying indicator VL2 lights up.
这样就克保证环境湿度控制在设定的数值，环境湿度由RP1来进行设定。同时，调整RP2和RP3，可对V1、V2和V3的工作灵敏度进行调节。
This ensures that the ambient humidity is controlled at the set value, and the ambient humidity is set by RP1. At the same time, the working sensitivity of V1, V2 and V3 can be adjusted by adjusting RP2 and RP3.
