These typical power supply designs contain a large mains transformer (which also provides isolation between the input and output) and a series regulator circuit. The regulator circuit could consist of a single zener diode or a three-terminal linear series regulator to produce the required output voltage.Today qihe smt pick and place machine sharing General design method of switching power supply. ,pick and place machine,,pick and place machine,smt pick and place machine,pick and place machines,pcb handling,led smt machine,used pick and place machine,smt line equipment,qihe,smt machine cost,how pick and place machine works,desktop smt pick and place machine,pick and place machine diy,