A HIFI Class B Amplifier Refer to NAP140 Circuit

A HIFI Class B Amplifier Refer to NAP140 Circuit

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.

IWISTAO HIFI Power Amplifier 80Wx2 Stereo NAP140 Mellow Soft Sound Tube Taste Black from IWISTAO HIFI MINIMART1 on Vimeo.

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.

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.

More Details, please visit 

HIFI Power Amplifier 80Wx2 Stereo Refer to Naim NAP140 Mellow&Soft Sound Tube Taste Black Whole Aluminum Casing 

IWISTAO HIFI Pure Digital Amplifier 2x150W

IWISTAO HIFI Pure Digital Amplifier 2x150W

Would you like to use a HIFI pure digital amplifier that support digital ports without a dedicated DAC? This one may be suitable for you.

This is a pure digital HIFI amplifier, that is amplified the pure digital signal directly and reduce intermediate converting. Specially, it support WIFI connection with your smart phones and tablet PCs directly, to connect the amplifier directly through WIFI. The amplifier interface is readily available, strong power, high efficiency, and green power. Compact and stylish, it is a good choice for forming a desktop audio. Sound performance, high-frequency positioning accuracy and no burr edge; middle frequency performance is thick, medium density; low frequency is jumping full force, fast response, high power output, large dynamic. Equipped with headphone output port, it can be used as a headphone amplifier also.

Stereo 2X150W HIFI Pure Digital Amplifiers with Coaxial Optical USB input

Features

1. Use of the American TI (Texas Instruments) HIFI pure digital DSP chip TAS5548 + TAS5614 asynchronous architecture.

2. High resolution of the sound field, accurate positioning instruments, structured. Have asynchronous digital processing capability, automatic identification, and 32k - 192k seamless transition.

3. Equipped with an infrared remote control, five buttons, including the switch, volume, channel selection three kinds of functions.

4. Selected HIFI material. Whole metal casing;10A high current DC socket; high-quality input and output terminals; aluminum knobs, FeSiAl inductors, NCC Black Edition capacitors with high-frequency low resistance.

Product Specifications

1. Output Power: 2 x 150W (4ohms)

2. THD: 0.01% (35v / 1W)

3. SNR :> 95dB

4. Dynamic Range :> 105dB

5. Output Impedance: 4 - 8 ohms

6. Operating voltage range: DC 15V-35V; recommended DC32V (No including power adapter)

7. DC output plug dimension: inner -- " +", outside -- “-”; and outside Diameter is 5.5mm, Inner Diameter is 2.5mm.

8. Popularly Digital Inputs: Coaxial / Optical (24bit32k - 192k).

9. Headphone amplifier: 40mW power under 32Ω. Also headphone output can be set as another audio output for subwoofer to form 2.1 speakers system.

10. Original software control speaker protection: Optocoupler isolation outputs for each channel independently detect to protect your valuable speakers.

11. Dimensions (L * W * H): 180mm * 120mm * 35mm

12. Weight: 1kg

13. Color: Black / Gold + Black body panel

14. Accessories:

      Remote control x 1

More details, please visit 

Power Amplifier Stereo 2X150W HIFI Pure Digital Amplifiers Audio Coaxial Optical Remote Control

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

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

Flagship Headphone Amplifier HIFI Full DC Amp Class A KSA5 Circuit Power Amplifier 8W Output Discrete Component

This headphone amplifier is much layered and extensions, that can realism distinctly and fresh feeling for every note, details, and layer. Its THD + N (THD + Noise) only is 0.00607% @ 1KHz & 300ohm load

Its design is based on KRELL headphone amplifier ksa5 circuit, which should be the most powerful amp circuit for driving force currently. With a gold seal input FET, and output stage used two pairs of ON transistors king NJW15034.15032 (or 15,032.33) with 8A output current per channel, that guaranteed enough low output resistance. Effectively to drive transistor used four small power one in parallel, its benefits are more detailed and better overtone. You can drive those flagship headphones like as HD800 HD650 Q701, and so on. And as a Class A amplifier to use, it has a strong driving force, there are four speaker terminals installed on the back panel, enough to push desktop speakers.

The whole material used are extremely well, everything prepared for the flagship headphones!