Into op-amp enthusiasts and integrated amplifier is the primary enthusiasts and students prefer to use two types of devices, they many varieties, different performance, sound and tone and each has his strong point. How the above two kinds of devices, combination collocation, can make, give play to their respective advantages, create the price performance ratio, is a problem worthy to be discussed.

The fever of a few years has accumulated some experience, also the inventory amount of audio devices. The integrated operational amplifier and integrated amplifier number, including early fever op-amp LM833N, NE5532N, NE5535N and recent hot OP275G, LT1057, AD827JN. Integrated amplifier is some very famous models, such as TDA1514A, LM1875T, LM1876TF, TA2030A LM3886TF and early. Of course, like JRC4558P, TL072 and TDA2030 these models of integrated blocks, because its performance is still not enough "fever" level, they no longer have to take out the research.

More integrated amplifier is the finished product has been completed plate, plate element, craft is exquisite, and is very concise. For the above a few op-amp, because are standard double op-amp, so only a front buffer amplifier board, is June 13, 1999, journal of e-paper AD827 in the fine article 1876 of the block. Element very fastidious, DALE w. gold film resistor, WIMA, ELNA capacitors, APLS potentiometer, double panel, silver plated process is also very good. I remove the AD827, change a 24 k plating Jin Yunfang socket.

As for power supply, op-amp with servo power + 15 v power supply, power amplifier is adopted big ring cattle, double bridge rectifier, ponds and small pond electrolytic power supply way in turn.

The author also invited a few like-minded friends burning, common evaluation. Listen to the sound of the time still choose after seven o 'clock in the evening, the purpose is to have a better environment. Equipment used amoi DVD8058A third generation and hi dulcet 2  1 c, software or hear ripe sacks, CAI qin song, Hugo Ⅰ, etc.

I have a passion for 1876 and let it lead, followed by its change into the six op-amp. Before, of course, the author use the combination of 827 + 1876 listen to are the best, won the consistent high praise. The collocation of high frequency have a strong music taste, smooth, balanced, natural, warm, let a person get drunk, low-frequency also clean, and freely. OP275 + 1876 combinations of slightly on the high frequency of expansiveness, low frequency slightly blurred, intermediate frequency is still outstanding, the overall feeling a little lost in AD827, is the pursuit of cost-effective choice. LT1057 is famous, but with 1876 collocation is not suitable, the problem on the timbre, always give a person the feeling of "cold", "thin". LM833 like NE5532, tone is warm, but very high frequency burr and low frequency is no tail, 5532 noise is larger. As for NE5535, change a channel after the serious distortion, estimates that have been damaged, then exit the contrast. To sum up, for LM1876 this amplifier, use AD827 can achieve maximum performance, and OLittle difference.