L7812CV-DG by STMicroelectronics Design and production,in Xiongsheng Micro Technology (Hong Kong) Co., Ltd. Spot sales,And can pass Xiongsheng Micro Technology (Hong Kong) Co., Ltd. Purchasing。L7812CV-DG Price reference $ 0.840000。L7812CV-DG - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information L7812CV-DG Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial