What is an Operational Amplifier?---OpAmps Tutorial Vedio

What is an Operational Amplifier?---OpAmps Tutorial Vedio

Operationl Amplifier, especially OP IC had been used in Power Amplifer as preamplifier or other functions. 

There is a excellent OP IC with metal seal, this is LME49720,which is ultra-low distortion rate; it is a professional audio op amp that is able to achieve total harmonic distortion and noise performance under 0.00003% or less in the world's only, and pursued and loved by many audiophiles around the world.

LME49720HA is one of the most top HIFI op amps IC in the world, low noise, high slew rate, wide operating voltage range and output current, etc., high overall performance is unprecedented, and can easily meet the most demanding audio application requirements. Ideal for professional and high-end audio system, it can be widely used in high fidelity buffer amplifier, high-fidelity active filters, high-fidelity headphone amplifier, high-fidelity phono equalizer amplifier, high-quality audio amplifier, high-fidelity preamplifier, high-fidelity multimedia, high-performance professional audio, high-fidelity balanced network, high-performance line drives, high-performance line receiver, mixer, etc. with the division.

LME49720HA is National Semiconductor's new generation of "op-amp of the Emperor", LM4562HA upgrade, sounds beautiful noble, comprehensive and balanced, clean sound at the end, natural, high analytical, dynamic large, low dive deep, IF full, people sound sweet and moist, high frequency transparent, delicate soft, contagious.

Specifications

Operating voltage: ± 2.5V ~ ± 17.0V

Harmonic distortion: 0.00003%

Noise Density: 2.7nV / √ ^ Hz

Conversion Rate: 20V / μs

But,do you know know-how of Operatial Amplifier. If you want to know more, please find the vedio below.




Also, there is a Closs A Headphone Amplifier and it is a preamplifier with OP IC LME49720HA, its sound is great.

http://www.aliexpress.com/store/product/Headphone-Amplifier-Discrete-Component-Pure-HIFI-Class-A-Amp-Lehmann-Upgraded-Version-Plastic-sealing-LM47910/725205_1931445868.html

Metal seal LM47910

Headphone Amplifier with OP LM47910 

Tube Hybrid Radio 6N2 Preamplifier AM/FM

Tube Hybrid Radio High Sensitivity 6N2 Preamplifier 12W Output Power AM /FM 4 Inch Speaker Desktop Wooden Cabinet

Its high-frequency is clarity and bright, structured, human voice restoring is true; powerful low-frequency thick, full of rich; treble is not exaggerated. Overall sound quality is balance and excellent. Clear radio effects, and unmatched by other products, it is a decorative and practical product.


It is high Sensitivity with 6N2 Preamplifier, and up to 12W Output Power, built-in 4 Inch Speaker Wooden Cabinet, suitable for placing on deskt.

More details, please find

http://www.aliexpress.com/store/product/Tube-Hybrid-Radio-High-Sensitivity-6N2-Preamplifier-12W-Output-Power-AM-FM-4-Inch-Speaker-Desktop/725205_32289104252.html

Learn more about phono stage amplifier

Learn more about phono stage amplifier

Phono amplifier is designed for a phono signal amplification while using Turntables amplifier inside for special sound equalization circuit (RIAA) for restoring vinyl, it cannot be used for other purposes.

Method for checking noise sources

After phono player connected with the phono amplifier stage, if there is a significant low-frequency noise, you need to check in which part of the noise. First unplug the phono amplifier input signal cable to disconnect connection between them, if the low-frequency noise disappeared or significantly reduced, that may explain the noise from the phono player; obvious if the same or reduce low frequency noise , the noise it is very likely to put itself caused by phono amplifier.

It may cause a greater frequency noise that no specialized non-standard phono ground wire.

Generally, nonstandard phonograph is a turntable part of music center to cope with this set of sound designed, when external phono amplifier put to ground that could cause a large hum due to the different ground ways

There is more Phono stage amplifier, and some PCBA Kit. More details, please find the links

Phono stage amplifier

http://www.aliexpress.com/store/group/HIFI-MM-MC-Phono-Amplifier/725205_256242016.html

Phono stage amplifier PCBA Kit

http://www.aliexpress.com/store/group/Amplifier-PCBA-Board-Finished/725205_256211124.html

Why do more audiophiles like class A tube amplifier?

Why do more audiophiles like class A tube amplifier?

Audio amplifiers in mass production typically use an integrated circuit to amplify the audio signal. Even though modern audio amplifiers reproduce audio signals with less signal distortion than their predecessors, some audiophiles prefer the "warm" tone a tube amplifier produces when it reproduces an audio signal. Except integrated circuit to amplify, many audio and power amplifiers sold for personal and commercial use contain electronic devices called transistors. Transistors came about as an intended improvement upon an older technology—the vacuum tube, used as an amplifier component since the early 1900s.

One common type of vacuum tube - the triode - is commonly used to create tube amplifiers. A triode is so named because it has three electrical connections: the grid, the plate, and the cathode. A triode can receive an alternating current - or AC - signal through the triode grid connection, and can amplify the signal by application of direct current - or DC - electrical energy across the triode plate and cathode connections. A Class-A amplifier operates at an efficiency level between 25 and 50 percent. Therefore, a triode-based Class-A amplifier requires a high-voltage (100-volt or more) DC power source to provide power to the amplifier. Unlike transistor-based Class-A amplifiers, a triode-based amplifier also requires a separate direct-current (DC) power supply for a cathode heater. Without the cathode heater activated, a triode-based amplifier will not work.

While many transistor-based amplifiers are capable of reproducing and amplifying a signal without noticeable signal distortion, someaudiophiles prefer the slightly distorted signal that a tube amplifier provides.

There are two types of tube amplifier output circuit: Push-pull output circuits that are wired so that the output current is split and runs in parallel, the other is single-ended output stages that are not split and run in a linear fashion. Single-ended tube amplifiers can generate more power from less current. Single-ended tube output circuits are used in both audio and instrument amplification. There is less distortion in a single-ended amplifier because the output currents do not cross over.

More Tube Amplifier, please find WISTAO online store at aliexpress

http://www.aliexpress.com/store/group/HIFI-Tube-Amplifier/725205_250077087.html

How to DIY your Shielded RCA Interconnect Cables

How to DIY Your Shielded RCA Interconnect Cables

This article is a guide to build your own simple high quality RCA interconnect cables for your Hi-Fi audio system. These "better DIY RCA interconnects" are unbalanced and made using shielded instrument cable and high quality RCA plugs. This is a fairly easy DIY cable and one stereo pair of DIY interconnects can be put together in about one hour. You will not need any fancy materials or special tools to build this cable. Just some meters of good shielded instrument cable and high quality RCA connectors, a soldering iron and some good solder with flux, a handy knife and a good side-cutter to prepare the wires for the soldering process. The photos only is as an example to demo how to DIY shielded RCA Interconnect Cables.

Material Prepared 

1.    High quality cable according to your requirements, and define its length, like as Canare Professional Broadcast Audio-cable.

Example of HIFI Cable

Constructions of Cable

2.    High quality RCA connectors which are black in color and with red and white indicator rings, and with gold-plated contacts and rubber end-boots to firmly hold the wire in place, like as Budweiser RCA connectors by U.S.

Example of HIFI RCA Connetor

Constructions of HIFI RCA Connector

Construction Steps

1. Strip outer of cable Insulator

  Strip Inner Insulator

2. Strip wires of cable inside

3. RCA Connector Plug Assembly Instructions

It is very important to slide the plug housing over the cable before you start to solder the wire to the connectors !!

4. Prepared Shielded Wire

5.  Soldering the wire to the RCA connectors with the fixture if need

6.Assembled RCA Interconnect Cable

Enjoy your cable! You will get more improvents of your HIFI system after to use this HIFI RCA cable.

We also sell this HIFI RCA Cable with Canare Professional Broadcast Audio cable and Budweiser RCA connectors by U.S., and it is made by manual also.This cable is high quality and cost effective. If you are interested in it, please take a look as the link below.

http://www.aliexpress.com/store/group/HIFI-Cable/725205_256186978.html

Its features as below

1. Used Budweiser RCA connectors by U.S, which is made of copper-plated plug, copper shell, and advantages of copper shell can be shielded from external interference.

2. Used Japanese origin Canare professional broadcast audio cable, and commercial grade products don’t achieve its performance, more than 94% of the copper network density to ensure effective shielding of electromagnetic noise. 40 each of the wires from the particular fine 0.08mm copper wire twisted together, particularly good durability. This is Canare send technical application structure model of work, it is a good choice for a lot of HIFI audiophiles to change the cables, its analytical abundantly clear, very good reputation, reliability and durability than ordinary wire several times stronger than the above, cheap affordable, high cost.

3. Used genuine Akihabara 99.99% high purity oxygen-free copper audio signal lines, each line adds four core nerves, its main role restore audio fidelity sound field, so the lossless transmission of audio signals have sufficient safeguards . General transmission line signals of different frequencies have different impedances, this feature on the sound reduction performance of sound vague, production people do this out of the high-end speaker cables called intelligent signal line characteristics of this line the signal level of the frequency is divided into two channels, 5KHZ more signals transmitted by a special material nerves, 5KHZ outer following signals through the transmission line, which greatly improves the frequency characteristics of the transmission line, the reproduction of clear and transparent sound.

4. Use containing 3% silver Senju solders soldering.

5. External plus a network of high-density shock as protection.

6.  It is made by manual.

More details, please find  the link  HIFI RCA Cable Thickened Wall Budweiser Connector Canare Professional Broadcast Cable