What are the AC voltage conversion principles?

(1) The AC voltage conversion circuit utilizes the primary winding tap of the power transformer.

(2) The power transformer has a characteristic that the primary winding and the secondary winding have the same number of turns per volt.

(4) The power transformer in this circuit is provided with a tap on the primary side, and the same AC input voltage is connected to different positions of the primary winding. As long as the number of turns per volt is the same, the secondary side of the power transformer can be ensured.The output AC low voltage is the same.