TEXASIN STRUMENTS LM124 LM124A LM224 LM224A LM324 LM324A LM2902 LM2902V LM224K LM224KA LM324K LM324KA LM2902K LM2902KV LM2902KAV LM2902 is a four independent high-gain frequency-compensated operational amplifiers produced by Texas Instruments. Its working voltage range is from 3V to 32V, and it can be powered by single power supply and split power supply.