LM2904DGKR by Texas Instruments(TI) Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。LM2904DGKR Price reference $ 0.123750。LM2904DGKR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information LM2904DGKR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial