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Wednesday, May 17, 2017
Saturday, April 29, 2017
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.
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| 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.
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.
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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.
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IWISTAO HIFI Bluetooth4.0 Decoder Stereo CSR8670 32-bit DAC AK4490 Hardware Decoding Bluetooth Optical Inputs PCM & DSD APT-X |
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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,
Wednesday, March 22, 2017
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.
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| 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.
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| 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
- Whole aluminum alloy casing.
- Built-16M memory within CSR64215 chip
- Adopted HIFI parts and components.
- Adopted imported original ST regulator, and digital power supply used independent of the LM1117 3.3 V regulator.
- Adopted independent hardware decoding ES9023 decoder chip
- Built power and signal indication on the front panel.
- Adopted independent external Bluetooth antenna with high sensitivit
- 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
Tuesday, March 14, 2017
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
- Basically to be faithful to H140 classic circuit.
- 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.
- Integrate volume control potentiometer.
- Integrate a two inputs switch on the front panel, you can switch the input source via the front panel.
- Add a midpoint adjustment circuit on differential input, generally midpoint can adjust to 5mV or less.
- 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!
- Use a special custom 200W HIFI OFC toroidal transformer, ensure enough reserve power!
- 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
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