LC-KING A Class A headphone amplifier circuit

LC-KING headphone amplifier circuit

For audiophiles, audiophile is equal to burning money. For some audiophiles who are not very economically comfortable, playing with headphones is a good best way to have a fever without too much money. The reason is very simple. Generally speaking, it is difficult to buy low-quality audio equipment on the market for two or three hundred dollars, but you can buy a very good pair of fever headphones, and the frequency response and various indicators of the headphones are not inferior to high-end ones. The speaker unit is also the main reason why the headphone amplifier DIY is popular at home and abroad. In the headphone amplifier, generally excellent discrete component circuits have been seen on many domestic and foreign websites, and they are made by electronic tubes, but for general enthusiasts. That is to say, it is difficult to find the components, and the matching of the tubes is also a headache. The difficulty of making the main transformer of the electronic tube has been solved.

At the request of netizens, I have found some easy-to-make headphone amplifier circuits for reference for those with better hands-on skills. The circuit diagrams are from domestic and foreign websites and electronic magazines. If there is a violation of your copyright, please notify me and I will delete it.

LC-KING A (A) headphone amplifier circuit

The picture above is a circuit diagram. The circuit is very simple. The pre-amplification push is NE5532 or other types of OP, U2A is DC SERVER, which is used to stabilize the potential of the midpoint, and the push level 2SD882 is an NPN type power triode. Therefore, the amount of heat generated is large, and the current flowing through R11 and R31 can be adjusted by changing its resistance. The transistor should be added with a radiator during production.

LC-KING's class AB amplifier circuit

The picture above shows the class-A power amplifier circuit of LC-KING. The amplification of the latter stage consists of the pair of tubes 2SD882 (NPN) and 2SB772 (PNP) TL072 as DC servo circuits, which play a role in stabilizing the potential.

The amplification circuit of LC-KING is relatively simple, and it is not difficult to manufacture. It can be completed with a hole plate, and the transistor of the rear pole can also be replaced with other tubes. The power supply of the amplifier also has a great influence on the sound quality. Of course, the use of Watian power supply is very good. You can also use the servo power supply. The power supply of the original picture is a little complicated. The key is that some components are very biased, so they are not put on the Internet.

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Ear amp made with dual op amps such as OPA2604

The picture above is a popular amp with an operational amplifier on the Internet. Of course, you can use other dual op amps to replace it to get different sounds. The use of two amplifiers in the picture above can improve the current output capability, which can promote High impedance headphones, most high-end headphones are high impedance. It is more popular to use OP234 or OP2134 (dual op amp) as the headphone amplifier on foreign websites, because the performance of the op amp is good when it is operated at low voltage, so that it can be conveniently powered by batteries. Make a portable amp.

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ZEN amp

The above is the amp circuit of ZEN. It is also a circuit that the domestic enthusiasts are happy to make in recent years and are said to be used to practice listening to the ears. There are also PCB boards that are supplied online for assembly by enthusiasts. The author did not personally practice it. But there is a chance to find a component and want to give it a try.

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MOSFET Class A amplifier

Technical area detailed analysis of Doherty power amplifier design load traction principle (top) detailed analysis of Doherty power amplifier design how to improve efficiency (lower) voltage follower input and output error analysis lm386 power amplifier energization will produce noise causes and treatment methods analysis class d Solve the effect of power amplifier on emi

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Posted at 2014-11-24 17:11 • 8980 views
Circuit design of ECG acquisition system using STM32
Circuit Design of Wireless Sending and Receiving Call System-Circuit Diagram Reading Every Day (...

This small system takes SPCE061A single chip as the core, the peripheral circuit includes: 4 × 4 keyboard, the infrared keyboard used in this system is RM-20 ...

Posted at 2014-11-12 10:45 • 2554 times read
Circuit Design of Wireless Sending and Receiving Calling System-Circuit Diagram Read Every Day (...
Design of D-type headphone driver circuit based on 555 timer

This design example provides two simple, inexpensive drivers for headphones and audio lines, as shown. These two drives are designed for electric guitars and violins, ...

Published on 2014-11-11 09:14 • 1266 views
Design of D-type headphone driver circuit based on 555 timer
Analysis of the classical circuit of negative feedback amplification

Due to the use of AC negative feedback, the theoretical analysis of the DC working state of the circuit after joining the feedback network should remain unchanged. At Protel 99 s ...

Posted at 2014-11-07 16:16 • 16252 views
Analysis of the classical circuit of negative feedback amplification
Circuit design of embedded seawater depth recorder based on FRAM

The depth of the ocean is an important parameter of ocean water. Knowing the depth of the ocean can prevent ships sailing on the sea from stranding and hitting the reef. Submarine activities on the seabed ...

Posted at 2014-11-07 15:37 • 612 times read
Circuit design of embedded seawater depth recorder based on FRAM
Design of Practical Amplifier Circuit for Class D Headphone Drive Based on 555 Timer

The popular 555 timer can be used as a PWM / D amplifier for musical instruments or other applications. It can be in the range of 4.5V ~ 16V power supply voltage ...

Posted at 2014-11-04 16:37 • 1945 views
Design of Practical Amplifier Circuit for Class D Headphone Drive Based on 555 Timer
Circuit design of wireless ECG monitoring system based on GPRS

A new electrocardiograph system based on GPRS standard is proposed. The system consists of monitoring terminal (portable ECG monitor), wireless network and monitoring ...

Posted at 2014-10-21 11:22 • 727 views
Circuit design of wireless ECG monitoring system based on GPRS
Negative feedback wideband amplifier circuit diagram module design

The picture shows a broadband amplifier circuit using negative feedback. The amplifiers of this circuit adopt transformer coupling, and the amplification part uses field effect transistors and ...

Posted at 2014-10-08 14:44 • 770 views
Negative feedback wideband amplifier circuit diagram module design
Design of Voice Recording Circuit Module Composed of HY560

This circuit is a simple recording circuit with a simple recording circuit that is small, power-saving, and does not require magnetic tape.

Posted at 2014-10-08 14:00 • 1311 reading
Design of Voice Recording Circuit Module Composed of HY560
Circuit design of infrared detection anti-theft alarm

The alarm can detect the infrared rays emitted by the human body. When a person enters the monitoring area of ​​the alarm, the alarm sound can be issued, which is suitable for home, office, warehouse ...

Posted at 2014-09-30 09:50 • 2905 views
Circuit design of infrared detection anti-theft alarm
The circuit diagram reads every day (15): Several analog circuits commonly used by

Electric Tea Kettle:

 

Quickly brew the perfect cup of tea or make pour over coffee right at the table with the Electric Tea Kettle. With 1500 watts, this Electric Kettle boils water faster than a microwave, and is safer to use than a stovetop kettle because it automatically turns off when the water reaches a boil. Serving at the table is no problem as the kettle lifts off the base without the cord. Additional features include two water level windows and a pull-lid to make filling and serving easy. 

 

Features:

  •  Thermostat Control – Having a thermostat control allows the kettle to [know" when to shut off. This will prevent damage to the heating element and is an important feature in all modern styles.
  •   Auto shut off/Boil Dry Protection/Fuse â€“ these are three features that are great for protecting the safety of users as well as extending the life of the electric kettle.  The fuse and boil dry protection shut the kettle off if the water gets down below a certain level or if it`s left on for an extended period of time, It doesn`t burn up the kettle.
  • Colors and Designs â€“ Electric kettles come in all shapes, sizes and colors. Finding one that will fit with the kitchen design is actually pretty easy.  Finding one that matches and that has the features you`re looking for can be a bit harder, but with all the choices available and the newer models on the market today, you will be able to find the perfect electric kettle for your kitchen.
  • Savety in Electric- the heating element is typically fully enclosed, with a power rating of 2–3 kW at 220V. In countries with 110V mains electricity, kettles may be less powerful (1–1.5 kW) to avoid drawing too much current and requiring a very thick supply wire.

Application:

Heat the tea thoroughly

Bottle the water/beer

Boil water

Electric Tea Kettle

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