You Jian Chui Yan from a Walkman Headphone Output Antiques Strong Analog Taste

You Jian Chui Yan from a Walkman Headphone Output Antiques Strong Analog Taste 

Teresa Teng's "Seeing the Cooking Smoke Again" is a song that evokes warmth and sentimentality. Whenever I listen to this song, it takes me back to the past and reminds me of the simpler times.

In today's fast-paced society, finding a moment to relax can be challenging. However, when you listen to Teresa Teng's "Seeing the Cooking Smoke Again" on your Walkman, you can transport yourself back to a time of innocence and warmth.

The lyrics in this song capture the beauty and simplicity of that era. Lines like "Seeing the smoke from the kitchen again, in front of the gate of my hometown" evoke memories of childhood and hometowns. This feeling is difficult to put into words but can be experienced through music.

Teresa Teng's "Seeing the Cooking Smoke Again" is more than just a song; it is a source of emotion and memory. Whenever you listen to this song, you will feel its warmth and emotional impact. Let us take a moment to reminisce about the good old days, and let Teresa Teng's voice accompany us through every day.

IWISTAO HIFI 2 Way 6.5 Inch Bookshelf Solid Wood Empty Speaker Cabinet Double Cut Corner 19L

IWISTAO HIFI 2 Way 6.5 Inch Bookshelf Solid Wood Empty Speaker Cabinet  Diamond Double Cut Corner 19L for Tube Amplifier

This is a pair of 2-way bookshelf solid wood empty speaker cabinet with dovetail structure and diamond double cuts corner, and its outside is a original wood color plus varnish red-brawn as the photos showed.

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IWISTAO HIFI 2 Way 6.5 Inch Bookshelf Solid Wood Empty Speaker Cabinet  Diamond Double Cut Corner 19L for Tube Amplifier

What is a SDR radio?

SDR (Software Defined Radio) is a software-based radio technology that uses digital signal processing and computer software to receive and process radio signals. While traditional radios use fixed hardware circuits to receive and decode radio signals, SDR uses general-purpose hardware devices, such as computers or dedicated SDR receivers, and software to perform the tasks of signal processing and decoding.

The main advantage of SDR technology is its flexibility and configurability. Traditional radios require specially designed and manufactured hardware circuits for specific frequency ranges and modulation schemes. The SDR can adapt to different frequency ranges and modulation methods by changing the software configuration, so as to realize the flexibility of various radio applications, including radio broadcasting, amateur radio, radio communication, etc.

SDR radios can receive and decode signals of various modulation methods, such as amplitude modulation (AM), frequency modulation (FM), single sideband (SSB), etc. It can also provide high-quality audio output and allow users to adjust and process the received signal through the software interface, such as frequency selection, gain control, noise reduction, filtering, etc.

Another important advantage of SDR radios is their ability to perform digital signal processing. The signals received by traditional radios are processed by analog and output audio signals, while SDR can process and analyze the received signals at a higher level through digital signal processing. This enables the SDR radio to implement some advanced functions, such as signal identification, spectrum analysis, digital decoding, etc.

All in all, SDR radio is a radio receiving device implemented using software-defined technology, which has the advantages of flexibility, configurability and digital signal processing, and can receive and process various radio signals.

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Full-band Full-mode SDR Radio Software radios Multi-function FM 3.5 Inches IPS LCD Screen Built-in 2500mAh Lithium Battery

Liang Zhu from IWISTAO 2X40W FU29 Pull Push Vacuum Tube Amplifier

Liang Zhu from IWISTAO 2X40W  FU29 Pull Push Vacuum Tube Amplifier 

"The Butterfly Lovers Violin Concerto"  often abbreviated as "The Butterfly Lovers" or "Liang Zhu". 

We played it with FU29 pull-push vacuum tube amplifier.

This FU29 vacuum tube named FY29 in Russian, and named 829B in American. It is a composite vacuum tube in which two Cambodian tetrodes are packaged in a same glass shell. It is generally used in power amplifiers with push-pull output, which can reduce tube selection and matching trouble. FU29 filament voltage is 6.3V, current is 2.25A, screen voltage is 600V, curtain grid voltage is 200V, zero letter screen current is 40mA, full letter current is 110mA. The grid bias voltage is -18V, the optimal load impedance from the screen to the screen grid is 13750Ω, and the output power (effective value) reaches 44W when the signal is full.

In order to further simplify the circuit, this unit uses a composite tube 6N2 for preamplification and phase inversion, so that a single channel can use 6N2 and a FU29 to complete the power amplifier task, and it has 40W power output. It is small in size, unique in shape, but strong in driving force. Do not use the power of general transistors or digital power amplifiers to analogize the actual driving force of this tube power amplifier, because the high supply voltage and unique output transformer’s structure, its output internal resistance change for high and low frequency signals is relatively small, and it has a good low frequency driving ability. And the sound is soft and smooth, warm and delicate. This is why the tube amplifier has not been completely replaced after the emergence of many new technologies.

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IWISTAO 2X40W Vacuum Tube Amplifier Pull Push FU29 Power Stage 6N2 Preamp Bluetooth 5.0 Whole Aluminum Chassis

What is an exponential and a hyperbolic Horn?

An exponential horn is a type of acoustic horn that has an exponential flare rate. This means that the cross-sectional area of the horn increases exponentially from the throat to the mouth. A horn with a flare constant of 1.0 is a true exponential horn, while a flare constant less than 1.0 is a hyperbolic horn. The details as below.

The formula is as follows,

m and fc (cutoff frequency Hz), c (speed of sound 34400mm/s)

Correlation In the case of the hyperbolic horn, the formula is

So, the specific calculation is more complicated, so I won’t go into details. Interested friends can do their own research, and here are so many, the main purpose is to show that the horn is not simply stacked with several boards, make a radian, and then seal a board on the left and right. It will work.

Therefore, the size of the horn is also fixed, and it does not support changing it to be larger or smaller.

The exponential horn has an acoustic loading property that allows the speaker driver to remain evenly balanced in output level over its frequency range.

An exponential horn works by increasing the overall efficiency of the driving element. The shape of the horn allows for a controlled cross-section increase, resulting in an impedance match between the sound source and the surrounding air. This means that an acoustic horn can radiate sound efficiently in a large frequency range. Efficient radiation is obtained when the pressure is in phase with the particle velocity, which requires a large surface at lower frequencies . The exponential flare rate of the horn helps to maintain an even output level over its frequency range.

The benefits of using an exponential horn include increased efficiency and improved output level balance over its frequency range. The exponential flare rate of the horn helps to maintain an even output level over its frequency range, allowing the speaker driver to remain evenly balanced in output level. This can result in greater acoustic output power from a given driver. Additionally, the shape of the horn allows for an impedance match between the sound source and the surrounding air, which can result in more efficient radiation of sound in a large frequency range.

An exponential horn is different from other types of horns in the way its cross-sectional area increases from the throat to the mouth. The flare rate of an exponential horn is exponential, meaning that the cross-sectional area of the horn increases exponentially from the throat to the mouth. This is in contrast to other types of horns, such as hyperbolic-exponential horns, which have a flare constant less than 1.0 and flare more suddenly at their mouth . The exponential flare rate of an exponential horn helps to maintain an even output level over its frequency range, allowing the speaker driver to remain evenly balanced in output level.

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IWSITAO Customized 1 Pair TAD TH4001 Hyperbolic Stable Diffusion Empty Wooden Horn 2 Inches Throat Birch Plywood Wide 612MM with Adapter

IWSITAO Customized 1 Pair Hyperbolic Stable Diffusion Empty Wooden Horn 1 Inch Throat Birch Plywood Wide 400MM with Adapter