Eight Thousand Cloud and Road Suona Playing

Eight Thousand Cloud and Road Suona Playing

Fork traditional music instrument Suona playing, the song is eight thousand li cloud and road...

IWISTAO HIFI Preamplifier Tone Adjustment Bass Tremble Middle OPA2604 LME49720 Whole Aluminum Casing Class A Power

IWISTAO HIFI Preamplifier Tone Adjustment Bass Tremble Middle OPA2604 LME49720 Whole Aluminum Casing Class A Power 

Here is the video for IWISTAO HIFI Preamplifier with Tone Adjustment for Bass Tremble Middle, there are 3 buttons for tone adjustment.

This preamplifier has tone control functions and adopts class A power, sound extremely delicate, slender high-frequency, low frequency plump and elastic, if use top op amp IC like as OPA2604 or LME49720, it will achieve perfect sound. Specially, it used a R-type audio dedicated transformer. And it has direct access function; you can skip tone adjustment to achieve original sound completely.

IWISTAO HIFI Preamplifier Tone Adjustment Bass Tremble Middle OPA2604 LME49720 Class A Power Stereo from IWISTAO HIFI AUDIO on Vimeo.



When audio sourcing record, speaker unit, placing the device is not necessarily perfect, and if your preamplifier adopt pure straight, it may not be able to meet the demand. At this moment, add tone adjustment function is very important. If you no extra power supply equipment, passive preamp tone is preferred, which can enhance the effect of high and low frequency is obvious.

More details, please click IWISTAO HIFI Preamplifier

IWISTAO 2x80W Transistor power Amplifier nap140

IWISTAO HIFI Power Amplifier 80W x 2 Stereo NAP140 Circuit Mellow and Soft Sound Tube Taste Black

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.

more detials, please visit https://www.iwistao.com/products/iwistao-hifi-power-amplifier-80wx2-stereo-refer-naim-nap140-mellowsoft-sound-tube-taste-black-whole-aluminum-casing-high-quality?variant=18278270140531

Traditional string music from vinyl record and Hi-end speaker

There is a video of Chinese traditional string music from the vinyl record and the hi-end audio system, enjoy it!

Tape also HIFI

Tape also HIFI 

Full analog taste rather than digital sound, tape also HIFI, we might have returned the last century，will you enjoy it?

Somewhere, Somebody from the hi-end speaker

Somewhere, Somebody from the Hi-end speaker...

How output transformer impact the sound of tube amplifier

How output transformer impact the sound of tube amplifier

Output transformer used in HIFI tube amplifier is a key component in high-fidelity audio equipment.

Tube power amplifier circuit is very simple relatively, but if you use output transformer that is produced by different manufacturers to make tube amplifier, the difference of sound is great. When output transformer in the transmission of audio signals, there will be eddy current, hysteresis, magnetic flux leakage and wire resistance loss, while the coil there is impedance, inductance and capacity resistance. These unfavorable factors will also be changed with the frequency of the audio signal changes. Therefore, the quality of the output transformer is related with its core material, quality of its core, enameled wire, winding method, size of the core air gap and so on, those directly affect the sound quality and quality of tube amplifier.

If output transformer output quality is not good, the biggest drawback is large distortion, narrow frequency response, high frequency and low frequency extension is insufficient, midrange is ambiguous, it sounds like tremble can’t achieve high frequency, bass is no powerful, orchestral instruments mixed together , There is no sense of hierarchy, the ensemble is heard is a noisy sound.

Therefore, sound quality is a decisive impact output transformer.

For tube power amplifiers, because loudspeaker is a low impedance element, the power of the high output impedance of tube must be transferred to a low impedance loudspeaker by some means. Usually use audio output transformer, which must be high quality, otherwise we try to improve the quality of amplification will come to naught.

There is a video that is 300B Vacuum Tube Amplifier, which is used IWISTAO Amorphous 8C Core Output Transformer.

Here, we provide you some high quality output transformers for you DIY your tube amplifier. The output transformer adopt core of Japan Z11(0.35EI) annealed silicon steel dedicated audio sheets, high quality oxygen-free copper wire coil package, and use pure pulp insulating paper between each insulated layer. Production process of output transformer defying cumbersome, adopt 2 out 3 clips or 4 out 5 clips method with hierarchical segmentation, placing paper with group by group, also with processes of meticulous, careful winding, vacuum impregnation, these lead to the transformer has good insulation and moisture resistant, transparent sound, sweet warm and mellow, excellent solution and clarity, as well as nice shape.

It is a better choice to tube amplifier audiophiles.

A Heaven-made Match Tube FM Tuner Plus 6P1 Tube Amplifier

A Heaven-made Match Tube FM Tuner Plus 6P1 Tube Amplifier

It is a finished tube FM tuner, whose tubes have been located on the same board, so it looks compact and elegant.And, it used 6N3 as a high-level and mixing, 6C11 as the unit local oscillates, IF amplification as 6J4 together with 5pcs mid cycle inductance, and it has the advantages of high sensitivity, low noise. After stereo decoded by TA7343AP, then the signal will be amplified by tube 6N2 as a preamplifier. 

Its casing is made of whole aluminum metal chassis, gold with rushed oxidation treatment, and the front panel with 8mm thick aluminum plate, the others with 4mm aluminum one. On the front panel, there are dual level meters to display audio signal level, and the digital frequency meter display FM reception frequency. Electronic tube with a modern digital frequency meter that is complementing each other with nice, classical and elegant style, maybe the frequency display board of the wireless receiver is the designer's wisdom. The lower right corner of the unit has a knob to manually tune the radio. All tubes are exposed at the top plate for heat dissipation purpose, and equipped with cat eye indicator there. The whole structure of the tuner is compact, components layout had been optimized to be more reasonable.

After connected with a power amplifier and speakers, you can listen to tube taste with music sweet and mellow. Here we connected it with a tube amplifier with tubes 6P1, and HIFI 4 inches full range speakers above.

 More detail, please visit,

IWISTAO Finished Tube FM Stereo Tuner Whole Aluminum Chassis

Weepin' Guitar in Cantonese

Weepin' Guitar in Cantonese

The song form Hi-end speaker and horn, Weepin' Guitar in Cantonese.

Hi-end speaker

Hi-end speaker

Enjoy CD-level Quality Sound with Wireless Bluetooth Connectivity

Enjoy CD-level Quality Sound with Wireless Bluetooth Connectivity

The new CSRA64XXX ROM series audio platform is designed for entry-level and mid-range Bluetooth speaker devices, bringing a new level of sound quality and functionality. It will be seen in the Bluetooth speakers, wireless headset, car audio, wireless hands-free products.

Bluetooth Tube Audio With CSRA64215

The audio platform supports Qualcomm's unique audio technology, including TrueWireless Stereo wireless stereo technology, cVc noise reduction technology, the sixth generation CVC voice enhancement technology.

The top model "CSRA64215" also supports aptX audio technology that provides CD-level sound quality with Bluetooth connectivity, as well as aptX low latency technology that can listen to aptX quality audio while watching video. "CSRA64210", "CSRA64110" are facing stereo, mono Bluetooth speaker equipment, suitable for high-cost effective products.

Three are built-in 16-bit stereo codec, digital-to-analog conversion SNR 95dB, support for Bluetooth 4.0 + EDR standard specification, Support A2DP 1.3, AVRCP 1.5, HFP 1.6 (including WBS / mSBC), HSP 1.2 and other related agreements, the effective distance of 10 meters.

There are some products that built in Bluetooth module with CSRA64215,whose actual listening experience is excellent.

It is a desktop Bluetooth tube amplifier, and will be better if it matched a pair high sensitivity speakers.

Tube Amplifier Wireless Bluetooth 4.2 Single-ended Class A Desktop 6N2 Preamp 6P1 Power Stage 2x3.5W APT-X

Or, you can us a Bluetooth 4.2 Decoder to refresh your old amplifier to enjoy CD level quality sound with Bluetooth connectivity. It is a Bluetooth decoder with Bluetooth 4.2 CSR64215 and DAC ES9023. The Bluetooth 4.1 version CSR64215 implemented   digital signal transmission thought wireless function, the digital to analog conversion of audio output used a professional decoder chip ES9023 to play that the digital signal is decoded into an analog audio signal.

IWISTAO HIFI Bluetooth 4.2 Decoder Stereo CSR64215 DAC ES9023 Hardware Decoding APT-X

If you need the Bluetooth decoder with CSR8670, you may find here.They are Bluetooth decoder with Bluetooth 4.0 CSR867 and DAC AK4490. The Bluetooth 4.0 version CSR8670 implemented   digital signal transmission thought wireless function, the digital to analog conversion of audio output used a professional decoder chip AK4490 to play that the digital signal is decoded into an analog audio signal, and finally OP amplified the analog audio signal and output it.

IWISTAO HIFI Bluetooth4.0 Decoder Stereo CSR8670 32-bit DAC AK4490 Hardware Decoding Bluetooth Optical Inputs PCM & DSD APT-X

IWISTAO Earphone Amplifier HIFI Solo with Bluetooth 4.0 CSR8670 32-bit DAC AK4490 Hardware Decoding Optical Inputs APT-X

A Bluetooth 4.2 Development Simulation Demo Board Based on CSRA64215 (For study only)

A Bluetooth 4.2 Development Simulation Demo Board Based on CSRA64215 

This Bluetooth development board is used to develop related Bluetooth products for developers only, which contains 4M FLASH, it is a fast, convenient, practical, necessary weapon for product development. This development board can be used to develop Bluetooth headset, car hands-free, Bluetooth speakers and so on.

You can find the features of CSRA64215 as below.

Features of the CSRA64215 Board

1. Provide 3W amplifier output, then speaker can be used directly as a Bluetooth speaker.

2. Provide 3.5 headphone output interface, can be used directly as a Bluetooth headset when plug the headset.

3. Provide 3.5AUX-IN port, support AUX-IN switch.

4. MIC interface, can be called to call, and provide debugging dual MIC noise cancellation function.

5. SPI debug burning interface, to facilitate the use of debugging.

6. Bluetooth IO port are reserved for the PIN, for development and debugging.

7. 8 keys, 8 IO port with LED instructions IO port working state.

8. Power button MFB provides key to boot and power on two ways.

9. Three-color LED instructions, debugging LED status more convenient.

10. USB communication function, used to debug USB sound card function.

11. This development board backplane can also be used for all other CSR modules.

Introduction of board interface

More Detils, please visit 

CSRA64215 Bluetooth 4.2 Development Board Simulation Demo Boards

There is a Development Simulation Demo Board for CSR8645, 

Bluetooth study tool---CSR8645 Rom Version Development Simulation Demo Board

A Bluetooth 4.2 Decoder with CSR64215 Plus ES9023 Hardware Decoding

A Bluetooth 4.2 Decoder with CSR64215 Plus ES9023 Hardware Decoding

After the Bluetooth decode with CSR8670 plus AK4490 DAC is launched, we would develop a similar one that is used CSR64215 plus ES9023, which is a smaller and compact, also is high cost effective. 

A Bluetooth 4.1 Decoder with CSR64215 Plus ES9023

It used Bluetooth 4.2 CSR64215 chip and DAC ES9023 chip, the previous implemented digital signal transmission thought wireless function, and support SBC, A2DPB, AVRCP, AAC, APT-X ( need your Bluetooth enabled devices support Apt-x also if adopt apt-x transmission) , the digital to analog conversion of audio output used a professional decoder chip ES9023 to play that the digital signal is decoded into an analog audio signal.

Bluetooth 4.2 Decoder's PCBAwith CSR64215 Plus ES9023

As you know, ES9023 is ESS's single-ended output DAC chip, but also  is very unique, simple one of their SABRE DAC series, is recognized the easist to sound good decoding chip. In the 3.6V power supply under our actual test, its output can be greater than 2Vrms, and no coupling capacitor structure, you will have to worry about looking for expensive coupling capacitors no longer , and do not need to worry about the capacitor to bring the audio distortion usually. In addition, we use 32ohm headphones to do actual test it can also be found very good drive, but the output will be slightly reduced. And for the connection with power amplifier, headphone amplifier and other circuits, it is just a piece of cake.

ES9023 uses the industry's advanced SABRE digital-to-analog conversion technology, this chip set the best sound quality, cost-effective in one, making it an ideal choice for digital-analog conversion. It also can be used in Blu-ray players, CD / DVD, HD set-top boxes, digital TV or audio receiving equipment and other products.ES9023 internal use of patented technology Hyper-flow (Hyperstream) architecture and time-domain jitter elimination technology, so that it can achieve jitter-free recording level of sound quality, dynamic range of 112dB.

You may use it refresh your power amplifier or upgrade it to get CD level quality sound with wireless way, a lot of audiphiles had enjoyed it...

Features

1. Whole aluminum alloy casing.
2. Built-16M memory within CSR64215 chip
3. Adopted HIFI parts and components.
4. Adopted imported original ST regulator, and digital power supply used independent of the LM1117 3.3 V regulator.
5. Adopted independent hardware decoding ES9023 decoder chip
6. Built power and signal indication on the front panel.
7. Adopted independent external Bluetooth antenna with high sensitivit
8. Signal flow: Bluetooth signal --- Bluetooth receiver module - digital shaping chip --- ES9023 decoder chip - output

More details, please visit,

IWISTAO HIFI Bluetooth 4.2 Decoder Stereo CSR64215 DAC ES9023 Hardware Decoding APT-X 3.5mm RCA Output CD Level Quality Sound