An Elegant Desktop Audio Based on LM1875 and PCM2706 (HIFI Amp + labyrinth HIFI speakers Cabinet)

An Elegant Desktop Audio Based on LM1875 and PCM2706 (HIFI Amp + labyrinth HIFI speakers Cabinet)

What is your expected desktop audio? Maybe you could say that it is an HIFI entry level at least, here you are, it might be suitable for if you want to look for an elegant desktop amplifier that based on LM1875 and PCM2706 which can decode the music from your computer or notebook,also include a pair of HIFI speakers which adopt two full-range speaker unit with labyrinth structure.

The Amplifier with DAC function, which is made of LM1875 and DAC used PCM2706, its panel is made of expensive rosewood, and using popular environmentally friendly water-based varnish with manual painted. The color of speaker cabinet is same as its amp panel.

Rosewood Panel

Back view of the amplifier

Rosewood panel

 Full-range speakers with labyrinth structure

Product specifications

HIFI Amplifier DAC

1. Input ports: Mini-USB and RCA x 2
2. DAC: PCM2706
3. Amp IC: LM1875
4. Rated output power:  2 x 10 W
5. Frequency response: 20Hz-20Khz
6. Total Distortion: 0.015% (@ 1 kHz 10W)
7. Output impedance: 4 or 8 Ohm
8. Signal to Noise Ratio: 105 Db
9. Amp Size (L*W*H): 130 mm * 110 mm * 40mm
10. Colors: Black
11. Gross Weight: 1 kg (Including power adapter)
12. Accessories

  USB cable x 1

  RCA cable x 1

  Power adapter (Input: 110-220v, Output: DC 24V/2.5A) X 1

 Speaker connection cable x 2

HIFI 2 Inches Full Rang Labyrinth Structure Speaker

1. Outer power: 2 X 10W

2. Impedance: 4 ohms

3. Speaker unit: 2-inch full-range neodymium speaker unit

4. Sensitivity: 84dB

5. Cabinet material: Wooden

6. Interface Type: RCA inputs

7. Weight: 1.6KG / pair

8. Dimension: 165mm X 72mm X 126mm

Package

Packing list

Applications

More details, please find http://www.aliexpress.com/store/product/2-Inch-Full-Range-Labyrinth-Speakers-HiFi-LM1875-Amplifier-PCM2706-DAC-Decoding-Valued-Packs-HIFI-Stereo/725205_32375082932.html

Class T Amplifier Based on TA2022 with Vacuum Tube Taste

Class T Amplifier Based on TA2022 with Vacuum Tube Taste

TA2022 is an efficient high-power digital chip, which has been loved by a number of audiophiles certainly regardless of quality and performance. Compared with TA2024, it's more powerful, more efforts, it can reach 90W + 90W power output maximum, and this is an advantage that TA 2024 can’t achieve. And we also use a copper wire toroidal power as power supply now, which is incomparable with the switching power supply where convenient switching power supply, although installation, low cost, but for power amplifier, its large dynamic is still far less than the traditional transformer. Also, adopt Japan imports potentiometers ALPS A special class audio potentiometer, non-ordinary potentiometer can incomparable. The thickness of PCB is 1.6mm with reasonable layout, the amplifier cannot hear the noise even in the potentiometer to maximum status.

TA2022 integrated in a DC step-down circuit (referred to as switch-type step-down), by an oscillator and a CMOS tubes, the external power inductor combination with high speed diodes and other components to work, when the DC-DC circuit, the inductor will produce a high-frequency switching signal that directly interfere with the internal digital modulation PMW circuit, high-frequency noise superimposed on the audio signal from the built-in high-power CMOS push-pull output, resulting in high frequency noise. Therefore, the amplifier board adopted a separate 5V regulator circuit with the transformer independent output voltage, and deactivated and shielded DC-DC converters of chip TA2022, So it built pure sound without noise, it is not comparable by those general TA2022 amplifier boards.

There is a class T amplifier based on TA2002 and preamplifier we used JRC5532DD operational amplifier. Brushed aluminum chassis, even its knob is made of whole solid aluminum machined, which is nice, excellent hand-feeling.

Class T Amplifier Based on TA2022

Inside View of The Amplifier

Back View 

PCBA of Class T Amplifier

About TA2022

Features

1. Aluminum chassis, all with brushed surface coloring treatment, first-class technology, excellence quality.

2. Optimized and reasonable amplifier PCB layout, and adopted copper wire toroidal transformer.

3. The amplifier board with protection circuit, convenient and practical.

4. Capacitance using extensive use of HIFI level parts, filter one using Black Edition, ELNA etc; coupling one using ERO, non-polarity AV Audio dedicated MKT capacitors by Italy;

5. Advanced UPC1237 full protection circuit, there is not any impact when power on

6. Built-in the circuit for tuning 0 on midpoint.

7. Built-in gold-plated preamplifier op amp IC base that has set up NE5532, you can use your favorite OP IC as replaceable and try different sounds from OP.

Specification

1.    Maximum output power: 90W + 90W

2.    Preamplifier IC: NE5532

3.    Power amplifier: TA2022

4.    Input voltage: AC 220V / 50Hz ± 10% (can be set AC 110V voltage input as your reqiurement)

5.    Dimensions (W * D * H): 184mm x 301mm x 60mm

6.    Weight: 3.6KG

7.    Color: black chassis with silver white panel

8.    Accessories: Power cord x 1

More detail, please find http://www.aliexpress.com/store/product/TA2022-Class-T-Amplifier-2-x-90W-Toroidal-Transformer-Power-Supply-NE5532-Preamplifier-Whole-Solid-Aluminum/725205_32265280712.html

Tube Amplifier 2 X 16W FU17 Mini Push-pull with Switching Power

Traditionally,a tube amplifier is fixed a large and big power transformer to output high voltage like as AC 300V or more, or 6.3V for filament of vacuum tube,then it will be heavier due its multi-outputs. Have you thought to reduce the weight but effect sound quality? Now, we developed a tube amplifier with switching power supply, it can realize the purposes.

Here,it is a tube amplifier with switching power supply, which adopted aluminum chassis designing, compact and simple, suitable for desktop hi-fi and home theater users. Used tube 6F2 as preamplifier, tube FU17 as power stage with push-pull circuit output that work with Class A and B, both sweet tube amp sounds, and bigger dynamic, stronger resolving power. 

Its output power is up to 2 X 16W. At the same time, it is built in DAC decoder, convenient external connection with a laptop, smart phone that must support OTG function.

We suggest that please use high quality signal audio cable to connect the amplifier, or play hifi audio sourcing like as CD, lossless signals (APE, FLCA, WVA) when the unit connect with signal sourcing via line-in, the you will get high quality performance from the unit.

Tube Amplifier Mini Push-pull with Switching Power Moddel WVTDSA-FU17

Wooden Panel--Tube Amplifier Mini Push-pull with Switching Power Model WVTDSA-FU17

With DAC input -- Tube Amplifier Mini Push-pull with Switching Power Model WVTDSA-FU17

Specifications

1. Output Power: 2 X 16W 

2. Signal Input: Line-in, USB (USB input priority)

3. USB part: DAC, support 16bit 48 KHz decoding

4. Frequency response: 20Hz-20 KHz (+ 0.5dB / -1dB)

5. Output Impedance: 4/8 ohms

6. Total harmonic distortion: 0.3% (1 kHz,5W)

7. Input Sensitivity: 0.3VRMS

8. Input impedance: 10K

9. SNR: 92dB

10. Tubes: 6F2 × 2 FU17 × 2

11. Operating voltage: 110 ~ 240V / 50 ~ 60HZ

12. Dimension (W * D * H): 125mm × 185mm × 120mm

13. Net Weight: 2.7Kg

14. Gross Weight: 3.5KG

15. Accessories:

Power cord x 1

3.5mm to 2 RCA audio cable x 1

support OTG function--Tube Amplifier Mini Push-pull with Switching Power ModdelWVTDSA-FU17

Application--Tube Amplifier Mini Push-pull with Switching Power Model WVTDSA-FU17

Application as desktop audio --Tube Amplifier Mini Push-pull with Switching Power Model WVTDSA-FU17

More details, please find http://www.aliexpress.com/store/product/HIFI-Tube-Amplifier-Mini-Push-pull-with-Switching-Power-Supply-2X16W-6F2-Preamplifier-FU17-Power-Stage/725205_32338488920.html

A HIFI Transistors Power Amplifier with Mellow and Soft Sound Tube Taste 2 x 80W

A HIFI Transistors Power Amplifier with  Mellow and Soft Sound Tube Taste 2 X 80W

Power Amplifier of Named Naim is one of those products worshiped by audiophiles like as Linn turntables. Though its unassuming appearance, but it has won the hearts by warm mellow tone. Naim price is not low, people who really know what was the expert are willing to spend money to buy it. If you are truly listening to music, you will feel that once you owned and not much else for this amplifier.

I love this circuit Naim NAP140 as much love for the 1969 circuit. Because it sounds isn’t worse than 1969, and its output power is far better than 1969. One feature of NAP140 amplifier architecture is its mostly second-harmonic distortion, so the tone is somewhat like as tube amplifier charm. But the difference is that it is very rewarding that the distortion of tube amp to achieve 0.1%, but this circuit can be achieved 0.01% distortion.

 HIFI Transistors Power Amplifier with Mellow and Soft Sound Tube Taste 2 x 80W

HIFI Transistors Power Amplifier with Mellow and Soft Sound Tube Taste 2 x 80W

Inside view -- HIFI Transistors Power Amplifier with Mellow and Soft Sound Tube Taste 2 x 80W

PCBA--HIFI Transistors Power Amplifier with Mellow and Soft Sound Tube Taste 2 x 80W

We made this HIFI amplifier to refer to Naim Nap140 designing, and hope in keeping NAP140 original fine circuit architecture as same premise, to use new devices, greatly improve the operating voltage and output power, improve stability, and to Try to do something to improve the circuit (for example, the circuit adapted to work class A state). The original unit is very popular with enthusiasts respected, but also the price of its second-hand is nearly USD 2000. We do not engrave it, and cannot do it, only with reference to its excellent circuit configuration. The amplifier’s circuit is very mature, stable, ultra-low power consumption, driving and control force is very, very good, far better than integrated circuit amplifier or similar circuit at same output power, it is cannot be compared by them. More commendable is that the sound of this Class B circuit is mellow and soft as same as class A one at low power consumption.

Its output power is able to reach 80W at 8 ohms and class B state.

Sch.-- HIFI Transistors Power Amplifier with Mellow and Soft Sound Tube Taste 2 x 80W

Features

1. Basically to be faithful to H140 classic circuit.
2. Add upc1237 speaker protection system, switch absolutely no impact sound while performing midpoint of DC protection, to prevent damaging or burn your expensive speakers due to the amplifier circuit.
3. Integrate volume control potentiometer.
4. Integrate a two inputs switch on the front panel, you can switch the input source via the front panel.
5. Add a midpoint adjustment circuit on differential input, generally midpoint can adjust to 5mV or less.
6. The finished unit with about 2KG heat sink, while it is whole aluminum design, this benefit other parts of the casing become heat sink also in addition, so that the total heat dissipation area greatly increased. Its actual operating temperature up to 40 degrees, low-carbon green!
7. Use a special custom 200W HIFI OFC toroidal transformer, ensure enough reserve power!
8. Use a lot of HIFI elements like as ALPS27 potentiometers, high-grade RCA connect, ELNA capacitors and HIFI chemicals one. Sound’s quality is the most important thing.

Specifications

1. Maximum output power: 80W * 2 (at 1KHz sine wave equivalent without distortion).
2. Frequency response: 20Hz-20KHz
3. Input sensitivity: <2Vrms.
4. Distortion: <0.01% (at 1 kHz)
5. SNR:> 100dB
6. Amplification voltage gain: 28 times.
7. Output impedance: 4 - 16Ohm
8. Supply voltage: AC220V / 50Hz
9. Average power consumption: <150W
10. Dimensions (W * H * D): 215mm * 70mm * 228mm
11. Weight: 4.8Kg
12. Accessories:

Power cord X 1

More details, please find http://www.aliexpress.com/store/product/HIFI-Power-Amplifier-80Wx2-Stereo-Refer-to-Naim-NAP140-Mellow-Soft-Sound-Tube-Taste-Black-Whole/725205_32522391541.html

Personalized Ultra-Class A (Class AA) Headphone Amplifier with Portable Design

Personalized Ultra-Class A (Class AA) Headphone Amplifier with Portable Design

Audiophiles had asked me, or whether the device or circuit determines the sound quality? In our experience, the answer is, circuit design, technology and debugging is more to decide sound, HIFI devices, op amp selection and personalized tone tuning is more to define Timbre. It is so-called HIFI to focus on quality, high-fidelity idea. The HI-END is integrated personalized tuning philosophy into the trend to the highest HIFI level.

There is a portable headphone amplifier that is designed according to the concepts as above. 

Portable Ultra-Class A (Class AA) Headphone Amplifier--Gray

Portable Ultra-Class A (Class AA) Headphone Amplifier -- Black

Personalized design, all aluminum casing, ultra-thin body. Circuit structure used a ultra-Class A (Class AA) circuit, because voltage amplifier stage of Class AA headphone amplifier is equivalent to a no-load state, no matter how the load followed by the headphone, it will not affect the voltage amplifier stage of work, which is common Amplifiers can not achieve that status. As results, it will make a very real interpretation of the music, space and very good positioning performance, and efforts to extend the sense of sound performance; it is just a little weird. In addition, we use HIFI grade components and process to make it, and bring a better listening experience.

It's PCBA inside

Selection aspect of the op amp, we used OP IC OPA2604 plus LM4562 match, we passed several tests comparing those match, we find that they can complement each other; If the preamp use OPA2604, and power stage use LM4562, we tested them with a 20KHz square wave, which output waveform distortion is very small. From the listening sensation, LM4562 relatively straightforward, OPA2604 more beautiful!

OP Amplifier used

Specifications

1.       Output power: 320mW (at 32 ohm)

2.        Headphone Impedance: 16 ~ 300 ohms

3.       Total Harmonic distortion: <0.0005%

4.       Frequency Response: 20Hz ~ 20Hz

5.       SNR :> 110dB

6.       Built-in rechargeable lithium battery 1200mAH

7.       Weight: 0.5kg

8.       Dimension (L * W * H): 100 mm * 61mm * 13mm

9.       Color: Black / Silver/Gray

10.       Accessories

    3.5mm audio cable x 1

    USB charging cable x 1

3 color selections

Appliccations by audiophiles

More detail, please find http://www.aliexpress.com/item/HIFI-Headphone-Amplifier-Portable-Ultra-Class-A-Class-AA-OPA2604-plus-LM4562-320Mw-16-300ohms-Li/32400230250.html