Sunday, August 28, 2016

HIFI Preamplifier with 3 Ways Active Electronical Crossover Linkwitz-Riley Filter

HIFI Preamplifier with 3 Ways Active Electronical Crossover Linkwitz-Riley Filter

Although many audiophiles put a lot of money and efforts to preamplifier, unfortunately they may experiences a little frustration in final output. It is hardly difficult to solve this problem to use excellent pre-divider circuit of preamplifier plus multiple power amplifiers, our series of electronic crossover board and amplifier board can perfectly realize your dreams!

There is a  HIFI preamplifier with 3 ways electronical  crossover,whose PCBA is refer to the ESP company by US, which is set to six-channel stereo output structure to output left and right channel stereo signal, this is, output treble of left and right channel, midrange and bass of left and right channel, you can directly connect it with 6 channel amplifier circuits then drive your HIFI speakers. Pre-electronic crossover ensures original and natural sound through separated frequency of pre-amplifier small-signal, then drive power amplifier directly to push speakers, allowing you to enjoy the atmosphere of the studio's site.

Crossover PCBA is constituted by renowned Linkwitz-Riley filter. Linkwitz-Riley filter, mainly for the active filter circuit, for example, it is used in many sophisticated multi-way electronic crossover systems. The characteristics of this filter is up to 4 stages attenuation slope, in other words, every one octave frequency sound energy will be attenuated 24dB, i.e. attenuation slope of -24dB / Oct (Oct ie Octave, an octave interval of the mean). Meanwhile, in the entire audio band (20Hz-20kHz), Linkwitz-Riley filter has a very flat phase response, which is far better than Butterworth filter after filter signal, no phase distortion, which is widely admired by audiophiles.

Wednesday, August 17, 2016

Stereo Mini Speaker With Water Dance

Stereo Mini Speaker With Water Dance

The speakers adopt obconic design, dual-channel 3D sound technology, full rubber side speakers, low frequency enhancement technology, and demonstrated extraordinary sound quality.

Through the music player volume and tone control water dancing.

Maybe it can increase the fun, When you take your leisure time...

Its operation is easy, power supply from USB of your computer or notebook or using 5V smartphone power adapter, then input music with a 3.5mm jack cable. After then, enjoy it!

More details, please visit Water Dance Speaker.

Saturday, August 6, 2016



After the previous version of this Tube FM Radio Head hit market, we have upgraded it with the new version, and keep its features of high sensitivity and high fidelity sound.

Now we added a digital display, you can display and adjust frequecy point of FM station.You only solder it on the main board-- tube FM radio haed board, and short the wire of signal input, the digital display board can induce the FM point and display it, so easy!

The photos of fixing the digital display board

Also you can find our prevoius post about this Tube FM Radio Head- It is just a nostalgic mood for tube stereo FM radio head kit 

More details, please visit IWISTAO Tube FM Stereo Radio Head 

Wednesday, August 3, 2016

Create beautiful sound from preamplifier and output strong power by power stage

Create beautiful sound from preamplifier and output strong power by power stage

Tube 6N3 is a medium u double triode, which is thick tube taste, and use to make tube preamplifier or tube headphone amplifier. Its performance parameters are same as the United States 5670, Russia 6H3, do it can be replaced by them directly.

Tube 6N3 is indirectly heated oxide cathode twin triode type, mainly used for high-frequency voltage amplification. Its internal structure is fully symmetrical, which makes 6N3 has excellent high-frequency characteristics, and sound localization. There was a shield, which makes 6N3 has a high Signal to Noise Ratio, which is very important in tube preamplifier designing. If you want to make a tube preamp, AC noise is loud, even its sound good, always fly in the ointment. But 6N3 has shielding layer, let the murmurs can’t be hardly heard when you touch your ear to speaker. As its distortion is even-order distortion, it let the sound of 6N3 is more comfortable when you listen music for a long time. At the same time, it can significantly improve distortion that the output of 6N3 adopts current feedback, let its sound be high-fidelity, and taste particularly strong tubes, musical and strong infection.

On the other way, TDA1521 is low distortion and high stability chip by Philips designed. The power output of TDA1521 is 2 x 15W at AC ± 16V voltage, impedance 8Ω, its Input impedance is 20KΩ, input sensitivity is 600mV, SNR is up to 85dB. Also, the circuit set up functions of waiting, muted, overheating protection, low offset voltage, high ripple rejection and low thermal resistance, excellent resolving power of high frequency and low intensity. Its pure transparent sound, intensity White chunky bass, treble clear and bright, very tube charm.

Therefore, this hybrid tube amplifier is 6N3 as a preamp, TDA1521 as a power amplifier; so that the two parts complement each other, exert hybrid tube amplifier characteristics, namely to create beautiful sound from preamplifier and output strong power by power stage.

Further, that is, the preamp section of power amplifier to use tubes amplify sound signal, enabling the input audio signal has a good sound performance as bright treble sound, full midrange, mellow and elastic bass, relatively "warm" sound and high dynamic range, with sound natural, lifelike characteristics, while overcoming tube amp music playback seem stiff enough with compared to transistor amplifier; the power amplification section to use transistor or power amplifier IC amplify the sound signal then output to ensure the speed and power to overcome pure tube amp sound "sense of speed" is not strong when playing fast-paced music does not make satisfied people's weaknesses.

The hybrid tube amplifier has three kind of signal inputs, CD , Aux and support U disk, SD card that support MP3 / WMA format files playback. You can connect the amplifier with PC or notebook, smartphone to play lossless format music like as WAV, FLAC,APE that played by music player through aux input as a desktop audio or PCHIFI amplifier, it will give hifi music enjoin and excellent experiences.

Workmanship and choice of materials are very cautious, used a double-sided fiberglass PCB, low loss transformers, excellent vacuum tube and full brushed aluminum casing. Sound authentic, no deliberate modification, nor omission, is a good partner of full-range speaker.

HIFI Desktop Amplifier -- IWISTAO Tube Amplifier Hybrid HIFI 6N3 Preamplifier

3 kinds signal inputs  -- IWISTAO Tube Amplifier Hybrid HIFI 6N3 Preamplifier

Support U disk & SD card  -- IWISTAO Tube Amplifier Hybrid HIFI 6N3 Preamplifier