Single-wire multi-electrical control device circuit

Circuit working principle: The circuit of the first single-wire control device is shown in Figure 4-19a
. Double switch S. , S2 is equipped with four diodes , and the 220 V AC mains power is first
rectified by this diode bridge, and then sent out through the double switch S, , S: When S． When both , S2 and S2 are
turned upward or both are turned downward, the corresponding electrical appliance has no power. When S． When it is turned upward, S:
when it is turned downward, the positive and negative pulsating DC current will be sent out correspondingly. The diode
VDs at the electrical appliance is turned on, and the electrical appliance L. Get electricity to work. When S． When S2 is driven downward and S2 is directed upward,
the upper positive and lower negative pulsating direct currents are correspondingly sent out. The diode VD6 of the electrical appliance k is turned on, and
the electrical appliance IJ2 is powered to work. VD, ~ VD4 diodes are installed in the switch box, and VD, and
VD6 diodes are installed next to their respective electrical appliances .