This circuit is directly connected to the power frequency AC 220V power supply, and the LM324 is used as the control chip, so that the EH emits 600W of infrared heat for heating. 100Kw-400Kw Silent Generator,12V Silent Generator,100Kw Silent Generator,Below 75Db Silent Generator Jinan Guohua Green Power Equipment Co.,Ltd. , https://www.guohuagenerator.com