Oppa Headphone Amplifier, a top-level power op amp, Opa Headphone Amplifier
Keywords: earphones, earphone amplifier circuit, earphone amplifier production, HIFI
Be
(one)
preface:
Little ear, countless masters are trained, the ear place is on the biliary, stone machine, gallbladder + stone machine. . . The total grinding of Lin Lin, the Ming Dynasty. But a price, as many seniors say: one point of silver, one tone quality. . . Suri! However, isn't it to make a wall?
As the soldering for many years, it will always want to break this "parity and no good goods". So, in your own poor "fever" box all over the search:
A: Electronic Tube Machine: If you want to catch fashion, it is of course as a press; but the electronic pipe is a high-voltage small current Jiao Miss spleen, no output transformer, the impedance is difficult to match, then said that OTL is due to the existence of the output coupled capacitor, beautiful voice The total difficult boarding is not as good as the output transformer. This output is not so good: for the response of the low frequency band, the inductance should be large enough, so that the number of turns increases, bringing distributed capacitance, make the high-stroke Frequency segment declines; in order to achieve large inductance and linear hysteresis curve under the number of small circles, the core material can be worthless, what ultra-thin cold rolling, 镆 alloy or even amorphous materials, in order to reduce the flour of the province Insulated paper, you have to use imported TIW triple insulation lines (no wonder importing as a big price). . . . There have been a month to wind a first-level total 72-segment experience. . . Kung Fu you can, but good iron core materials and wire? Never encounter, it is not available, plus the original value of only a few meters of bile duct now "appreciation" is tens and hundreds of rice. . . It is cheap to can't break the law!
B: Transistor model (including FET): Most fever insoders are purely discrete circuits, and they have been in the same day, and finally the last is Desig, the output stage is adopted. SANKEN (three reclamation) is specifically for Hi-Fi development of the power pair of thermal compensation circuits (SAP16P / N); this tube has just been sold for two years, dedicated to W-grade Amplifier, two years later Sony can be used in its Hi-End level. However, its machine circuit is complicated, inconvenient for beginners DIY; in addition, it is not too capable to break the law from the cost.
C: Universal Optical Machine: The current general op amp is already in the past, and it can reach hundreds of megabyte gain bandwidth. However, it can only be used for small current amplification. In order to extend the transistor or FET, this has brought the inherent problem of the work point debugging, the thermal stability, etc., in the early years, I saw it in the OCL made by the enthusiast. However, there is almost no manufacturers to use this structure for finished machines (please note: In the next, the mystery is self-satisfied.
Ding: (nonsense for half a day, the protagonist finally debut !!!) Power op ammeter: At the end of the 1990s, US National Semiconductor (NSC) has introduced power-type op amp LM12CL, the main performance indicators are as follows:
1. Working voltage: +/- 30V2. Output current: +/- 10A3. Power frequency sound: DC_60KHz (80W) 4. Daxim: 0.01% 5. 交 * Interim distortion: 0.015% (60 Hz / 7 kHz, 4: 1) 6. Rising rate: 9V / US
how about it? It's not a problem with the headset? The op amp also has perfect protection functions such as input protection, thermal protection, dynamic range protection, overvoltage overcurrent protection.
Just coming out, because the price is too high, it can only be used in the field of servo control. There are also people to use DIY amplifiers. I have found the mail order magazine in Yuqus, I have bought it, but the outer casing is very thin, the logo is rubbed, and the sound quality is flat. . .
Until the sample was taken from the US NSC Agent, it really appreciated its charm: First, the housing is much weighing (this is the style of NSC), sound quality? The prototype will invite friends with your ear to verify. It is a cememaker, never write subjective comments, this is left to play in terms of skill DX. In short, using a full set of signal sources, distortion instruments, oscilloscopes (under the working environment without lack of these stuff), prove that NSC's indicators are not empty!
What is the current price? Is this the most concerned about it? Not low, USD16.9, but because of its peripheral especially simple, it is considered to control the whole machine cost at 0.5 km? ? ? (Km).
First post a basic circuit: complete application circuit includes a volume control circuit, power supply, and headphone protection circuit (with backward), all the princes interested in this opinion can also log in to http: // www. National.com/ds/lm/lm12cl.pdf.
(two)
I have worked for a long time yesterday. I went a day today, I finally called the new prototype. After the frequency response test was used to use the signal generator and oscilloscope, I can't wait to answer the signal source (Arcam Delta 270). The disc is the "foggy feelings" that usually like: Li Liuxin's three-blouse jazz; "The Raven" Lubbekka (big eye girl) people sound the sky; "Mahler Fourth Symphony" also has a sign "Dance Party" is a high-explosive dynamic dancing music. As for the headphones, I said it is a bit sweating. . . . There is only one Walkman's PX100 in front of the next eye! Despite this, the ear is also the "ear people" level, is not just right? ? ? I thought it was: like the true meaning of the earer of the ear, the true meaning of the equipment is to be happy! hehe. . . . (Later, I used HD650 audition, naturally it is a bigger floor.).
After the ear is powered on, the measured output noise is 6mV, and when the earphone plug is inserted, he can't hear the "click" sound; if the volume is not connected to the head, noise can be heard. On the case of the CD, the bottom white noise of the very weak (barely resigned) CD machine is heard.
This sample is not elapsed, and the sound is inevitable, but it has been able to hear enough music details, and there is enough power under the burst of electronic music (dance music), which does not use any "tonic" component. It is a quite good audibility.
From a pure technical point of view, it still reaches all the indicators given by American National Semiconductors: We may wish to put it and its brothers, everyone is more familiar with LM3888:
LM12CL LM3886 Daximity: 0.01% 0.1% Frequency Response: DC-60KHz (80W) 20HZ-20KHz (68W) Circuit Structure: PNP-NPN full mutual NPN-NPN quasi-complementary online quote: 16.9 US $ 2.0-2.1 US $
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