A Key of Bluetooth Speaker or Bluetooth Amplifier --- Bluetooth module

A Key of Bluetooth Speaker or Bluetooth Amplifier --- Bluetooth module 

Bluetooth speakers or bluetooth amplifiers have become more and more popular now as wireless signal transmission. You could see them  every year at CES. At same time, bluetooth Technology had been improved from 1.0 version to 4.1 one now, it is can achieve CD level music for the bluetooth 4.0 version, and it is used hifi audio.You will not connect those signal input cable, only set up bluetooth connection between your bluetooth devices like as iPhone or android smartphone, tablet.Then, you can play stream music form your local disk or internel through WIFI, of course, you should install a music play, if it support to play lossless format such as WAV, APE, FLAC, APAC, it absolutely achieve CD quality. 

But do you know how it is used in PCB?  normally, it is soldered as a module where the bluetooth ic and other op ic will be soldered there, also the program will be burned on ROM inside previously.manufacturer purchase it from module supplier, which is customized by the supplier, for example display name on the host, prompt, volume..., and so on.We also provide those customizations. There is more stable and quality module that is made of CSR8645, which support apxt decoding.The moudles had been used in a lot of bluetooth speakers or amplifiers, like as FATMAN mini tube bluetooth amplifiers and other Bluetooth speakers by UK.Especially, the original manufacturer of bluetooth ic provide us strong support from PCB designing.

 It is better to start weaving your fishing nets than merely coveting fish at the water, right? If you want to  develop your high quality Bluetooth speaker or amplifier or modify your current audio system to ass wireless connection function, it will be a better choice.

This CSR8645 Rom Module Functions:

1. Bluetooth version 4.0 plus EDR standard specification.
2. Radio power: Class 2.
3. Support A2DP 1.2, AVRCP 1.4, HFP1.6(including WBS and Msbc), HSP1.2.,etc protocols.
4. Adopt CSR voice enhancing technology of latest sixth version CVC to realize noise reduction and echo cancellation.
5. Support multipoint connection (connection to 2 phone for voice and music)
6. Support CSR Secure Simple Pairing, Proximity Pairing and CSR Proximity connection.
7. Support user to define muliti-language voice prompt function.
8. Support voice dialing / rejection calling.
9. Support SBC, MP3, AAC, APT-X music format.

            10. Support output port: PIO / UART/SPI/AIO/SPK/MIC/USB.

            11. Built-in 16 bits stereo decoder, S/N of digital to analog convert is up to 95Db.

            12. Built-in DC DC conversion power management.

            13. Integrated Li-ion battery charging function, charging current is up to 400mA maximum.

            14. Smaller SMT package: 26.5mm*13mm*2.2mm.

            15. RoHS compliance.

 More details, please find http://www.aliexpress.com/store/product/CSR8645-ROM-Bluetooth-Module-Bluetooth-4-0-Mulitport-Output-Support-APT-X-Decoding-DIY-RoHS-Compliance/725205_1276174862.html

Or use this one with key board.

http://www.aliexpress.com/store/product/CSR8645-ROM-Bluetooth-Module-Bluetooth4-0-Mulitiport-Output-Support-APT-X-Decoding-With-Key-Board-DIY/725205_1644152718.html

Beauty Guitar Playing and Singing

Beauty Guitar Playing and Singing

Beauty Guitar Playing and singing..., the song only belongs to the heaven，it is hardly heard on the earth. The vedio from youtube, great guitar playing and sing the song!

Perhaps you like guitar playing and singing, there is no problem when you play and sing as practice by yourself.But, if you open a small guitao concert,you might need a guitar amplifier speaker to amply your sining and guitar’s accompany,then show your as you like.

There are some guitar amplifier speaker for different output power, you can select them according to your needs.

http://www.aliexpress.com/store/group/Guitar-Amplifier-Speaker/725205_256242019.html

Simple way to improve sound quality of your amplifier or HIFI speakers

Simple way to improve sound quality of your amplifier or HIFI speakers

Many audiophile spend a lot of money to desire improving the sould quality of their audio system like as amplifier or HIFI speakers.But they don't find a shortcut sometimes.If we can make sure the signal transmission isn't lossless through connetion cable, we will get twice the result with the half effort, of course, it based on the other components that work well at least.

 The simple method is to use high quality connection wire or cable into your amplifier, HIFI speakers such as OCC cable.There is an OCC cable, which is made of 22AWG OCC frozen crystal copper with PE coat, pure sound extremely transparent nature really.Suitable for used as headphone cable, connection cable in amplifier.

We may use it as audio connection wire in amplifier, use it to make speaker cable, use it to make power cord...

Comparisons between OFC and OCC under High-power microscope, we can see the construction of this OCC Frozen Signal Crystal Copper 7N (99.99995%) wire.

Its specifications as blow

1. 7N (99.99995%) single-crystal copper OCC Frozen copper wire
2. Conductor: 0.06 mm * 25 pcs
3. Outer diameter: 1.45mm
4. Insulator: PE coat

More details, please find http://www.aliexpress.com/store/product/22AWG-OCC-Frozen-Signal-Crystal-Copper-7N-99-99995-Cable-for-DIY-Headphone-Cables-Amplifier-Connection/725205_32494917538.html

IWISTAO Tube Preamplifier with Matisse Fantasy Line Stage GE 5670W for Your Upgrading Car Audio

It is a Tube Preamplifier with Matisse Fantasy Line Stage GE 5670W, and its power supply is DC 12V, you may use it to update your car audio system from the DC12V.

The main feature of Matisse Fantasy Line Stage is sweet mellow sounds, calm and powerful low-frequency sound field is very open, like a sense of the scene, and here it goes without saying! Since tube preamp birth, it is well known as its design concept for distinguished from commonplace, pure and transparent sound quality to really spotless, and become a world-class reference.

The circuits adopt British famous circuit of Matisse Fantasy Line Stage, and with 12VDC power supply (Recommanded Power supply: DC12V / 1A ). The HIFI Tube Pre-Amplifier is made of HIFI imported components like as United States AB resistance, which can bring a sense of warm and soft vocals, Philips filter capacitor charging and discharging more reliable, Germany ERO coupling capacitor to that make the sound more balance, ALPS potentiometer sound good but also durable, gold-plated contacts Cinch make the connection more reliable and greatly reduce transmission of resistance signals.

Also there is vedio to paly music and it is taken by iPhone 5S.

More details, please find http://www.aliexpress.com/store/product/Free-Shipping-DC12V-HIFI-Tube-Pre-Amplifier-with-Matisse-Fantasy-Line-Stage-5670W-Tubes-HIFI-Component/725205_1610495358.html

What is an Operational Amplifier?---OpAmps Tutorial Vedio

What is an Operational Amplifier?---OpAmps Tutorial Vedio

Operationl Amplifier, especially OP IC had been used in Power Amplifer as preamplifier or other functions. 

There is a excellent OP IC with metal seal, this is LME49720,which is ultra-low distortion rate; it is a professional audio op amp that is able to achieve total harmonic distortion and noise performance under 0.00003% or less in the world's only, and pursued and loved by many audiophiles around the world.

LME49720HA is one of the most top HIFI op amps IC in the world, low noise, high slew rate, wide operating voltage range and output current, etc., high overall performance is unprecedented, and can easily meet the most demanding audio application requirements. Ideal for professional and high-end audio system, it can be widely used in high fidelity buffer amplifier, high-fidelity active filters, high-fidelity headphone amplifier, high-fidelity phono equalizer amplifier, high-quality audio amplifier, high-fidelity preamplifier, high-fidelity multimedia, high-performance professional audio, high-fidelity balanced network, high-performance line drives, high-performance line receiver, mixer, etc. with the division.

LME49720HA is National Semiconductor's new generation of "op-amp of the Emperor", LM4562HA upgrade, sounds beautiful noble, comprehensive and balanced, clean sound at the end, natural, high analytical, dynamic large, low dive deep, IF full, people sound sweet and moist, high frequency transparent, delicate soft, contagious.

Specifications

Operating voltage: ± 2.5V ~ ± 17.0V

Harmonic distortion: 0.00003%

Noise Density: 2.7nV / √ ^ Hz

Conversion Rate: 20V / μs

But,do you know know-how of Operatial Amplifier. If you want to know more, please find the vedio below.




Also, there is a Closs A Headphone Amplifier and it is a preamplifier with OP IC LME49720HA, its sound is great.

http://www.aliexpress.com/store/product/Headphone-Amplifier-Discrete-Component-Pure-HIFI-Class-A-Amp-Lehmann-Upgraded-Version-Plastic-sealing-LM47910/725205_1931445868.html

Metal seal LM47910

Headphone Amplifier with OP LM47910