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大家都知道甲类功放，效率低，发热大，功耗高。 那是因为甲类功放，每一级的静态电流都很大。 每一级电路在工作期间，所输出的信号功率所需的能量，都是从机器的三极管静态能耗当中取出。 简单的说，功放静态功耗500瓦。实际播放音乐的时候，输出25瓦音乐功率。 这时候机器本身的功耗就变成475瓦特。不放音乐的时候，他损耗500瓦。 为什么大家喜欢这样的设备呢，因为任何一个微小的音乐细节都不会丢失。 信号到达这台机器的时候，机器有足够的能量来应付这些信号的工作所需。 音色很特殊，保真度高。对音频信号而言，机器的内阻特别低。 简单的打个比方，一个土财主，富二代。以前面的比方机器消耗500W对应到他的口袋。 口袋里任何时候都保持有500万块现金。 注意，这里说的是现金（钞票） 那吗，在他的生活当中，任何一个机遇需要25万块钱额度的生意，他都能即时抓住并完成生意。 他的生活，极致潇洒。需要的开支能随时应付。 为什么这个富二代口袋里有500万块，但只给他二十五万块的生意呢？ 别忘了，这是有钱人的生活，我不懂。 他要维持富二代的做派，余下的用在这里。 所以，他只愿意在生意上花二十五万块。 我们为什么强调是现金（钞票）在口袋里而不是银行存款或者银行授信呢。 这就是土财主和现代人的区别啦。 甲类功放的消耗功率是固定的，有没有音频信号，他都要消耗这么多。 比如前面我们说的500W钞票随时在他口袋里。是不是土财主的做派？ 土财主比较老派，不太愿意冒风险。 尽管任何时候口袋里都有500万，但他给自己的风险管控额度就只有25万。 这样的人，做不大。是一个典型的享乐者，只要自己过的舒服，对社会只愿意承担25万的社会责任。 只愿意承担5%的义务= 25/500 X 100% 如果需要从银行去取钱做生意，就是我们的AB类啦（甲乙类） AB类功放，很有钱。但他的钱都在银行，这就是现代富豪的生意经。 现代富豪的生意经也有好多种类： 第一种，这银行就是他开的。那吗，在银行财产额度内，他的生意是不是顺风顺水？ 这一种设备，近似于由蓄电池供电的功放机。 蓄电池容量有500千瓦.时，蓄电池内阻很低（自身花费很少）因此效率很高，音质也很好。原因是他不需要更多的回路去审批。 这样的机器，我们国家现在已经基本被淘汰了。蓄电池太重，资金效率低。再说国家环保政策也不容许。 银行不能随便开的..... 就算边缘山区也很少，可能在世界其它贫穷国家还在使用。这些国家不具备完备的金融系统。 第二种，就是我在银行有很多存款，那些钱是我名下的活期存款。我生意需要多少，银行无条件的会给 予我账户额度内的数额，并且几乎零时差的给予付款。 这种功放，虽然也是Class AB 但是他的供电回路容量特别大，速度高，能量交换的时间在纳秒级。这 种设备，现在市场上的丹麦，英国的大品牌产品。 音效好，也很节能，但是天下没有免费的午餐，条件是你得花大价钱。任何一台后级功放都超过10万块 人民币甚至美刀。当然啊，机器本身价值加上品牌溢价 第三种，我们还是以生意人来打比方，我们在银行有1笔存款，所有权属于我。同时银行也给予了对应额度的授信。 对机器而言，他的能量都在供电系统。 但供电系统容许我超载（超额使用，超额部分就是银行授信，可以很快使用，但需要行长签字） 相对而言，高效节能，资金效率很高，偶尔做一笔大生意，还能得到银行支持。 但是，缺点也很明显，转瞬即逝的机遇，我就抓不到了，因为我要银行行长签字。 对于音乐播放来说，就会损失很多高频的细节。 我能买得起的也就这一类，经济实惠的普通货色。 A simple amplifier We all know that class A power amplifier, low efficiency, high heat, high power consumption. That's because the class A amplifier has a large static current at each stage. During the operation of each stage circuit, the energy required for the output signal power is taken out from the static energy consumption of the machine's audion. Simply put, the static power consumption of the amplifier is 500 watts.When the music is actually played, the output is 25 watts. The machine itself consumes 475 watts.He wears 500 watts when he doesn't play music. Why do people like such devices? Because not a single musical detail is lost. By the time the signals arrive, the machine has enough power to handle the signals. The tone is very special, high fidelity.The internal resistance of the machine is particularly low for audio signals. To make a simple analogy, a rich man, rich second generation.The previous example was that the machine consumed 500W corresponding to its pocket. Keep 5 million dollars in cash in your pocket at any one time. Notice, this is cash. Well, any opportunity in his life that required a quarter of a million dollars in business, he was able to grab it and finish it right away. His life, the extreme chic.The expenses needed can be met at any time. Why does this rich second generation have 5 million in his pocket, but only give him a quarter of a million in business? Don't forget, it's a rich man's life. I don't understand. He wants to maintain the style of the rich second generation. The rest is for here. So he was only willing to spend a quarter of a million dollars on the business. Why do we emphasize that cash is in the pocket and not bank deposit or bank credit? This is the difference between a rich man and a modern man. The power consumption of class A power amplifier is fixed. It consumes so much whether there is an audio signal or not. For example, the 500W bill we mentioned above is always in his pocket.Is it the work of the landowners? Landowners are more old-fashioned and less willing to take risks. Although he has $5 million in his pocket at any one time, he gives himself only $250, 000 in risk control. Such people, do not do much.As a typical hedonist, he is only willing to assume 250,000 social responsibilities for the society as long as he is comfortable. In other words, he is a typical playboy who only CARES about his own pleasure. I'm only willing to assume 5% of my obligations is equal to 25/500 X 100% If we need to withdraw money from the bank to do business, it will be our class A and B. Class AB amplifier, very rich.But his money is in the bank. That's the business of the modern rich. There are many kinds of business for the modern rich: First, he owns the bank.So, within the bank's line of assets, is his business going well? This device is similar to a power amplifier powered by a battery. The accumulator has a capacity of 500 kilowatts. At 500 kilowatts, the accumulator has very low internal resistance (which costs very little on its own) and is therefore very efficient and has good sound quality.The reason is that he doesn't need more circuits for approval. Such a machine, our country is now basically obsolete.The battery is too heavy and the capital efficiency is low.Moreover the national environmental protection policy also does not allow.Banks can't just open... Even marginal mountain areas are rare and are probably still used in other poor countries around the world.These countries do not have complete financial systems. Second, I have a lot of money in the bank, which is a checking account in my name.My business needs, the bank will unconditionally give me the amount in the account limit, and almost zero time difference to pay. This amplifier is also Class AB, but its power supply circuit capacity is particularly large, high speed, energy exchange time in the nanosecond.This equipment is now on the market in Denmark, the United Kingdom's big brand products. It's sound and energy efficient, but there's no such thing as a free lunch, as long as you spend a lot of money.Any post-stage amplifier is more than 100,000 yuan or even US dollars.Of course, the value of the machine plus the brand premium And the third way, again, let's use the business analogy, is that we have a deposit in the bank, and it belongs to me.At the same time, the bank also gave the corresponding amount of credit. In the case of a machine, its energy is in the power supply. However, the power supply system allows me to be overloaded (the excess part is the bank credit, which can be used quickly, but the President's signature is needed). Relatively speaking, efficient energy efficiency, high capital efficiency, occasionally do a big deal, but also get the support of the bank. However, the disadvantage is also obvious, I can not catch the passing of an opportunity, because I want the bank President to sign. For music playback, a lot of high-frequency details are lost. That's all I can afford, cheap, ordinary stuff. |
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