Amplifier electronics TB503 2

My friends didn't make it clear.

t indicates that the material of the resistor is a carbon film resistor.

b denotes a potentiometer that is exponentially characteristic. Note: The volume potentiometer should choose an exponential potentiometer, since the human ear's response to the volume increases exponentially (that is, when the sound pressure level doubles, we don't sound twice as loud), so the volume potentiometer increases exponentially with the angle of the knob.

Linear potentiometers are denoted by x.

Finally, 503: the first two digits 5 and 0 are significant figures, and the following 3 represents the 3rd power of 10, that is, 50*10 to the 3rd power = 50000 ohms = 50 thousand ohms, which can also be written as 50k ohms. The last *2 indicates the combination of two potentiometers with the same resistance, commonly known as a duplex potentiometer, which can be used to adjust the volume of two channels at the same time.

TB stands for Class B and 503 stands for 50K ohms *2 is a dual channel It is indeed a very common potentiometer, which is easy to find in the electronics market, and it is better to find Class A. Class A volume adjustment is smooth, and Class B volume changes greatly (when the volume is just adjusted, the volume is suddenly much larger when the volume is in a certain position). If there is no 50k, then 20k, 100k can be replaced, and there is no impact on the sound.

50 thousand ohm two-channel potentiometer, a very general thing, there are those who repair household appliances.

1. Power transformer:

The power transformer should make a reasonable choice according to the total power consumption of the circuits of each part of the machine, the whole machine has enough reserve strength, the power of the power transformer, the power of each part of the machine, the total power dissipation of the circuit is more than twice the power of the power amplifier of the class A amplifier, the power of the power transformer should be doubled on this basis.

2. Resistance: The resistance should be selected as much as possible precision metal film resistor five-color ring, the error should be controlled below 1, the design margin should be as large as possible, the total power supply should be higher than a quarter W, the emitter resistance of the power tube or the current negative feedback, the sampling resistance of the circuit), the power between the resistors should be 1 2 W 5 W, so as to improve the stability of the whole circuit work.

3. Capacitance: The capacitor should be selected as much as possible to choose a special type of acoustic, with imported high-quality capacitors as the first choice, and large capacitors (such as power filters and decoupling capacitors) should be used to withstand voltage higher than the power supply voltage and the capacity is as large as possible Special electrolytic capacitors to improve the filtering effect.

4. Connect the wire:

The wire is the choice of the power amplifier, the conductor that connects the high current (such as the power line, the power output line and the ground), and the conductor with thick multi-strand thin wire twisted copper wire to overcome the skin effect of the current passing through the wire. Wires with smaller wire diameters can be used for small current connections, using different colored wires to distinguish between different wires, red wires for positive power, green or blue wires for negative power, and black wires for ground.

5. Power amplifier circuit:

For the production of power amplifiers, the choice of power amplifier circuits should be more important to determine the choice according to the listening environment and the playback preference (balance) of the timbre is elegant, warm or temperature variations, the power amplifier circuit structure (class and ab class or other types) and the model of the circuit (capacitors, resistors, tubes, etc.) of the components or assemblies.

Go to ** to buy a set of power amplifier board parts, there are made PCB boards and required components, go back to soldering yourself

Buy a set of successful amplifier circuits. Such as: Wait!

There are too many of them, and it is impossible to say them in detail, so I can only talk about them in general.

The power supply part has a transformer, a rectifier bridge stack, and a filter capacitor.

The power amplifier board part has all kinds of resistors, capacitors, transistors, diodes, power amplifier tubes, heat sinks, and small fans are needed for large heat generation.

These can only be said in general terms, and it depends on the design.

Now the power amplifier is not assembled by yourself, you buy a ready-made power amplifier according to the power you need, no need to add additional electronic components, that is, with the corresponding plug, lead,

CD player front to back amplifier audio cable box.

The power amplifier board generates a lot of heat is the power amplifier tube and the power supply switch tube.

The amplifier tubes with high heat generation are equipped with aluminum heat sinks. You can see it at a glance.

I'm going to Beijing to buy some electronic components, what are the electronic cities where I can buy these things. Power amplifier boards, transformers, speakers, etc. Beijing Zhongguancun Haidian Huangzhuang subway station side, new Zhongfa Electronic City various.

This is a digital amplifier board with a tone circuit. Devices that are prone to breakage are: digital power amplifier chips, potentiometers, three-terminal voltage regulators and voltage regulator chips, and some capacitors (withstand voltage, thermal failure, etc.). Specifically, the fault can be described.

Audio power amplifier belongs to the audio power amplifier, which is commonly divided into stage power amplifier, household power amplifier, multi-power amplifier, car power amplifier, portable power amplifier and so on according to different use occasions. No matter what kind of power amplifier, in addition to the difference in function and circuit, the following components are commonly used:

1. a transformer; Some portable amplifiers also come with batteries.

2. Electrolytic capacitors: rectifier filtering, decoupling, signal coupling.

3. Ceramic capacitors, polyester capacitors, polypropylene capacitors: depending on the circuit.

4. Resistance: All power amplifiers need to be used, the difference is type, power, and accuracy.

5. Diode: depending on the circuit.

6. Transistor (including power transistor): depending on the circuit.

7. Integrated circuit: depending on the function and circuit.

8. Fuse (tube): protection.

9. Wire rod and connector: connection function in the circuit.

10. Circuit board: All power amplifiers need to be used.

11. Potentiometer: depending on the circuit.

12. Relay: depending on the circuit.

13. LED LCD VFD display: for indicating the status of the power amplifier.

14. Switch: depending on the circuit and function.

Mainly depends on your product needs? Many manufacturers have TDA series like ST manufacturers are used in this area! ON manufacturer's MJW21195 and MJW21196 on the tube.

Philips and Toshiba have many brands. If you need a specification or something, you can find me.

transformers, capacitors, resistors, sliding rheostats, as well as 78 series, 79 series, TDA1521, speakers;

Hehe! You have to have the power amplifier circuit diagram first, configure the components according to the drawings, and make the circuit board yourself.

Now an old amplifier is only thirty or fifty yuan, don't get it, if you really want it, I have a 100w queen digital radio, you take it for one hundred yuan, super large ring cow. If you really want to play with it, contact me again. Getting an old TV motherboard is a power amplifier.

Besides,** on the speaker vfd Blu-ray super dazzling amplifier is now only more than two hundred. When electronic products are rapidly developed and eliminated, the first price of housing directly leads to all electronic products, including cars, becoming garbage, and all the workers in our factory have notebooks, and half of them drive to work. Don't get it, get a job.

Based on your question, I suggest you don't have to worry about it.