[Usage] Operational amplifier OPA627: adopts field effect tube input mode, suitable for front and rear amplifiers, output buffers, voltage amplifiers, headphone amplifiers, etc. The sound is warm and charming, the sound field. The sound quality is delicate, soft and graceful, with high clarity and bold taste. You can replace or upgrade the common dual op amps in audio, LM833, LM4562, 4558, 5532, 4556, LF353, OP275, AD712, AD827, AD746, AD797, OPA2604, OPA627 to dual, OPA637 to dual, AD797 to dual, AD843 to dual , AD847 to double, etc. [Appearance] Gold-plated adapter board pins. OPA627AU SMD single op amp, exquisite adapter board, fully gold-plated pins. [Instructions for use] When changing the op amp, be sure to see it clearly, and align the missing mark of the small half of the upper part of the op amp with the missing mark of the Ic socket and insert it accurately. It cannot be inserted backwards, otherwise it burn! Type: Dual Op Amp Module Model Number: OPA627 color:Blue+black Material:Plastic + Metal Package Contents: 3 x Dual Op Amp Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.