What is the difference between a discrete component amplifier and a centralized amplifier?

The principle of integrated successful amplifier IC and discrete power amplifier is the same, but due to the size and process limitations of the integrated IC, the output power is in a limited state, generally up to W

The discrete component power amplifier is actually the amplification inside the integrated amplifier IC, and each component is assembled separately, so the relative integrated amplifier is not only powerful, but also has a lighter sound. The advantages will be more obvious.

Discrete amplifiers are affected by different components and present different characteristic sounds, which is why most of the famous audiophile amplifiers form their own characteristics.

Generally, those who have played discrete will no longer play integrated ICs.

The power amplifier composed of discrete components, if the circuit is well selected, the parameters are properly selected, the component performance is excellent, and the design and debugging are good, the performance is also excellent. Many high-quality amplifiers are discrete amplifiers. However, as long as there is a problem with one of the links, the performance will be lower than that of the general set.

In addition, in order to prevent damage to components such as overload, overcurrent, and overheating, complex protection circuits are required. The core circuit composed of triode, diode, resistor, capacitor and other devices is successfully placed in the vertical component group, providing room for free adjustment.

The integrated discharge circuit is mature, the low frequency performance is good, the internal design has a composite protection circuit, which can increase the reliability of its work, especially the integrated thick film device parameters are stable, no need to adjust, the signal-to-noise ratio is small, and the circuit layout is reasonable, the peripheral circuit is simple, the protection function is complete, and the heat sink can also be added to solve the heat dissipation problem.

For various reasons, it is difficult for integrated circuits to achieve high power output. Most of the fool power amplifier circuits on the market are not integrated circuits in the strict sense of the word, but are mostly thick film circuits.

Thick film circuits are composed of discrete components, at most the pre-amplification is an integrated circuit, and the rear stage is a discrete component. It's just that these circuits are encapsulated together, and they look like integrated circuits.

Due to the dense density of thick film circuits, it is impossible to use large capacitors and large amplifiers like discrete components. Dynamic range.

It can't be big, so thick film circuits are just a popular fool's product. The discrete component amplifier can be designed according to each person's characteristics and hobbies.

The performance of the IC power amplifier is determined by the IC manufacturer, and it should be used around its fixed performance when used, with simple circuits, few components, and excellent performance. The discrete component power amplifier can add or decrease components for the addition or extension of a certain performance, the power can be designed at will, and the heat dissipation can also be dispersed. But have a good circuit.

LM3886: It is a new 68W mono high-fidelity power amplifier with over-voltage, over-temperature protection and noise suppression function, LM3886 can work when the supply voltage is more than 10V, but the output power is reduced. The LM3886 is available in two models:

LM3886TF and LM3886T, the former is insulated by heat sinks, and the latter is not insulated. At 4 loads at 35V, the peak output power is 135W, and theoretically BTL can output 540W peak power, but this power does not mean that your amplifier is 540W.

tda7294：

The new high-power DMOS power amplifier IC TDA7294 launched by STMicroelectronics is loved by the majority of audio enthusiasts for its high power, perfect protection function, and quite good timbre, and has become the first choice in the audio power amplification IC in the audio DIYER at home and abroad, and then STMicroelectronics has launched the TDA7293 with better performance and power, which has a wider voltage supply range than 7294, a larger dynamic range and higher output power, and a dual 40 volt DC power supplyIt can reach an average output power of 100W at 8 ohms, although if the voltage is boosted to dual 50V, or a smaller load such as 4 ohms, there will be a larger output power (120W).

In addition, you can think about LM1875, TDA1521, etc., and the power is not small.

There are also thick film amplifiers for fools 175, fools 275, fools 2100 and the king of amplifiers D1000.

TDA7293, 7294, 7295, LM3886TF This is currently the most used high-power set among burners, all of which have a rated power of 50 watts.

lm3886：

It is a new 68W mono high-fidelity power amplifier with over-voltage, over-temperature protection and noise suppression function from the National Semiconductor Corporation (NS).

tda7294：

The new high-power DMOS power amplifier IC TDA7294 launched by STMicroelectronics is loved by the majority of audio enthusiasts for its high power, perfect protection function, and quite good timbre, and has become the first choice in the audio power amplification IC in the audio DIYER at home and abroad, and then STMicroelectronics has launched the TDA7293 with better performance and power.

Integrated block: refers to the integrated circuit, the integrated block is the entity of the integrated circuit, but also the popular name of the integrated circuit. Literally, an integrated circuit is a form of circuit, while an integrated block is a physical reflection of an integrated circuit.

On September 12, 1958, Kilby developed the world's first integrated circuit, successfully realized the idea of integrating electronic devices on a single semiconductor material, and passed the inspection of the top management of Texas Instruments.

Those are resistors.

The color is like this:

Black, Brown, Red, Orange, Yellow, Green, Blue, Purple, Gray, White, Gold, Silver.

The penultimate ring represents the number of zeros.

Color ring resistance. The last digit indicates the error.

This rule: brown, red, two orange are three, four yellow, five green, six are blue, seven purple, eight gray and nine are white, black is zero, and gold, five silver, and ten table errors.

For example, red, yellow, brown, and gold represent 240 euros.

The color ring resistor is divided into four rings and five rings, and four rings are usually used.

The penultimate ring can be gold (for and silver (for , and the last ring error can be colorless (20%).

The five-ring resistance is a precision resistance, the first three rings are numerical values, and the last ring is an error color ring, usually gold, silver and brown three colors, the error of gold is 5%, the error of silver is 10%, the error of brown is 1%, the error of colorless is 20%, and occasionally there is an error represented by green, and the error of green is. Precision resistors are commonly used in military, aerospace, etc.