As operational amplifiers and integrated power amplifier is the two kind of device and the students love the most primary fancier fancier use, their variety, different performances, and each one has its own merits. How to timbre and tone to the above two types of devices can make the best use of collocation, combination, play their respective advantages, to create the best performance price ratio, is a problem worth discussing.
I have a fever a few years of history has accumulated some experience, but also a considerable number of inventory audio devices. The integrated operational amplifier and integrated power amplifier for many, including early have a fever op LM833N, NE5532N, NE5535N and LT1057, the recent hot OP275G, AD827JN. integrated amplifier is some very well-known models, such as TDA1514A, LM1875T LM1876TF, LM3886TF, and early TA2030A. of course, like JRC4558P, TL072 and TDA2030 of these types of integrated block, because its performance is still not "have a fever", will no longer have to come up with research.
The integrated power amplifier above all is the finished plate, plate element, craft is exquisite, and is very simple. As for the several op amp, as are the standard Dual OP AMP, so only a front buffer amplifier board, is to use AD827 1876> in June 13, 1999 < < fine > electronic newspaper on the block element: DALE W. Very elegant gold film resistor WIMA, ELNA capacitor, APLS potentiometer, silver plated double sided board, technology is also very good. I remove the AD827, put on a 24K gold-plated op amp socket.
As for the power supply, the operational amplifier uses servo power supply + 15V to supply power. The power amplifier adopts the big ring ox, double bridge rectifier, the large pond and the small pond electrolysis power supply mode
The author also invited several like-minded fans, common evaluation. Listening time is selected after seven o'clock in the evening, the purpose is to have a good environment. The equipment has the third generation DVD8058A Hivi and Amoi dOuchy 2. 1C software, or listen to the familiar Sax, Cai Qin song, Hugo 1.
I love 1876, let it take the lead, followed by replacing it with the six operational amplifier. Of course, the author used 827+1876 to sense the best combination, won praise. This collocation middle high frequency has a strong musical taste, smooth, balanced, natural, warm, let a person get drunk, too low smooth and clean, free combination of.OP275+1876 in high frequency extension sense slightly worse, low frequency slightly blurred, if it is still good, the overall feeling slightly inferior to AD827,.LT1057 is the preferred pursuit of cost-effective is a great reputation, but with 1876 collocation is not appropriate, the problem in tone, giving people a "cold", "feeling.LM833 and NE5532 thin" similar to the warm tone, but also a strong sense of low frequency high frequency burr, cannot receive the tail, 5532 of the noise is also slightly larger. As for NE5535, put on a serious channel distortion, estimated to have been damaged, then quit on. In summary, this work for LM1876 The highest performance can be achieved with AD827, while OP275 has high cost performance
Next we put on LM3886, feel it and 1876 is very similar, but more power. AD827 still feel better.OP275, NE5532, LM833 these three differences after not only OP275 low frequency is better, and it can convert the rate of 22V/ms on.LT1057 still reflects the characteristics of heavy metal, let this combination for home theater feel good, dynamic, momentum enough. Especially I > in the < < Hugo > "the picture exhibition Kiev gate was a very majestic.
In the famous LM1875 power amplifier, AD827 is not very prominent, so LT1057 is one of the artificial earthquake, the overall balance, tone moderate, high and low frequency rich music details are handled just perfect especially background music, Kenny G Sax < > spring triangle accompaniment, especially clear and sweet,.NE5532 and OP275 all threads neatly tied up collocation the 1875 is good. Especially in 5532, it is cheap, and 1875 have the same conversion rate, not the speed of the "bottleneck" problem, make the best use, it is recommended, LM833 is slightly worse.
For 1514A, because it is a "cold" type power amplifier, are hard to get along with LT1057, AD827 several other OP, OP275 better.NE5532, LM833 also with the collocation, but if the total is not satisfied. Comprehensive consideration, on 1514A, OP275 is the first choice, not very prominent, but also quite satisfactory.
The final appearance of the TDA2030A, although it is yesterday, but the community has a large quantity, and a considerable part of computer active speakers still use it, our proposal can be used as a massage machine refer to the 2030A user. We recommend the use of NE5532 or LM833, they have no enough 2030A collocation, necessary to pursue another from three. Listen to the feeling, very little difference.