Sunday, November 29, 2015

A tool to improve sound of HIFI Speaker-- Shock Spike & Mat Kit DIY

A tool to improve sound of HIFI Speaker-- Shock Spike & Mat Kit DIY

It is very simple that working principle of shock spikes, that is by reducing contact area to increases the pressure of speakers or amplifier device, thereby restrain vibration generated by the end of the jump instant, stable to direct wave. And absorb, attenuate the shock given by the equipment itself, block external shock given.

In order to achieve these two points, materials of shock absorbers nail must be three characteristics, high-quality, high hardness, high shock attenuation rate.

Although quality steel has the characteristics of high quality, high hardness, it is lack of high attenuation. In this regard, we put material with high attenuation characteristics to combine with the steel to obtain this "three high" characteristics. After a series of material screening, we finalize the selection of quality SUS304 stainless steel and graphite polymer combinations. Through debugging proportion for materials used, we finally completed this spikes.

The sound character of nails is very thick density, while maintaining the sense of low frequency, which greatly improves line and solid feeling of high-frequency, and expand the ends of frequency response widely, three-bands is equalized, has excellent control in large dynamic, and open sound field as if the music has injected vitality, flew alive! This upgrade is definitely more important than the change of signal cable or power one.

HIFI Speaker Shock Spike & Mat Kit


HIFI Speaker Shock Spike & Mat 



3M Sticker


Two diameter




Thursday, November 26, 2015

2 x 25W HIFI Bluetooth digital power amplifier with Bluetooth 4.0 CSR8635 Placying CD Level Music



Have you looked for a Bluetooth Amplifier without cable connection? You may only use wirelessBluetooth connection through your Bluetooth enabled devices, this one will be a better choice.

Specially, it built in CSR8635 Bluetooth module, that adopt Bluetoth 4.0 technology. And you can enjoy CD level music once connected with you smart phone and play lossless traces, like as WAV, FLAC, AFAC, APE format music...

As a desktop amplifier, output power of this HIFI Bluetooth 4.0 digital amplifier is  2 * 25W stereo with whole aluminum enclosure, matte oxidation process; Adopted customized advance air core inductors to improve the LC filter of digital amplifier, which is the most important aspects for digital amplifier, Adopted 3300uf BC-048 filter capacitor as a reservoir with internal shun in order to meet the power needs bursting to solve problem of partial handsome voice for switching power supply;

Also it built in speaker protection and power-delay circuit, so there was no impact sound switch and protect your valuable speakers; 












Specifications of this HIFI Bluetooth digital power amplifier as below.
  1. Signal input: Bluetooth 4.0 + EDR; RCA line input
  2. Work type of amplifier: Class D
  3. Working efficiency: about 88%
  4. Quiescent current: 50mA
  5. Rated output power: 2 * 25W
  6. Frequency response: 20Hz to 20KHz
  7. THD: 0.09% (@ 1W)
  8. Output impedance: 4 / 8Ω
  9. Working voltage: DC9V to DC15V


More details, please find http://www.aliexpress.com/store/product/Free-Shipping-HIFI-Bluetooth-digital-power-amplifier-PAM2021-2-x-25W-Bluetooth-2-1-EDR-RCA/725205_1314318116.html

Monday, November 23, 2015

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.



WHFA-K1875DAC

WHFA-K1875DAC(1l)


Rosewood Panel


WHFA-K1875DAC(Al)

Back view of the amplifier


WHFA-K1875DAC(Bl)

WHFA-K1875DAC(A1l)

Rosewood panel

WHFA-K1875DAC(2l)

WHFA-K1875DAC(sp1l)

WHFA-K1875DAC(sp2l)

 Full-range speakers with labyrinth structure


WHFA-K1875DAC(inl)

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

WHFA-K1875DAC(Packagel)

WHFA-K1875DAC(P2l)

Packing list


WHFA-K1875DAC(P1l)

Applications


WHFA-K1875DAC(a4l)

WHFA-K1875DAC(a2l)

WHFA-K1875DAC(a3l)



WHFA-K1875DAC(a6l)






Thursday, November 12, 2015

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.


WHFA-T2022(011)
Class T Amplifier Based on TA2022

WHFA-T2022(1L)
WHFA-T2022(L)

WHFA-T2022(3L)
Inside View of The Amplifier
WHFA-T2022(bl)
Back View 

WHFA-T2022(pcba2L)
PCBA of Class T Amplifier

WHFA-T2022(pcba1L)-jpg


About TA2022
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





Saturday, November 7, 2015

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

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