LM324D by Texas Instruments(TI) Design and production,in Shenzhen Yirenxin Technology Co., Ltd. Spot sales,And can pass Shenzhen Yirenxin Technology Co., Ltd. Purchasing。LM324D Price reference $ 0.420000。LM324D - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM324D Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial