Seems to play with headphones, static electricity is a topic that can't go around. Flat and dynamic headphones can share amps, while static headphones must be driven by dedicated amps, and are generally not cheap and have a higher threshold. However, due to the presence of power amplifier adapters, there is no dedicated amp can also be heard, it may not be able to push, but you can enjoy the elegance of static electricity.
â–² The protagonist of this time is stax's sr-007mkI. It has been discontinued and cannot be bought. The second-hand price is about 1w. Outer packaging is a simple route. The reason why we need to mention mkI in particular is that because of the mkII version that came out later, the general wind rating is not good, and mkI's rating is not bad, so if you plan to play friends need to pay attention to the version. For the sake of simplicity, it is referred to as 007 later.
â–² Remove the outer paper cover, inside is a box, very good grade.
â–² Open the box, and lay 007 diagonally inside it.
â–² 007 uses a brown gold match, the unit bracket and net cover are champagne gold, the head beam, earmuffs and headphone cable are brown, the overall comparison is elegant.
â–² The headphone unit hook is fixed, and the angle cannot be fixed.
â–² The headphone unit is large, and it seems that the tablet and the electrostatic headphone unit are relatively large. The head beam uses a double bar structure similar to AKG. The outer ring of the unit and the headphone cable can be rotated freely, and the design is very strange.
â–²Adaptive headband is very wide, no pressure head feel, very comfortable. The head-beam link coats a layer of leather and looks very good.
â–² 007's headphone cable is noodle type, it seems that electrostatic headphones are all such lines. The jack is different from a general headset and it has 5 pins.
Rkv vetro_ Taobao search jd, Amazon, Tmall did not have to sell, put Taobao search for reference s.taobao.com direct link â–² Originally, the static earphone needed a dedicated amp, but with the RKV Vetro amplifier adapter, even if there was no static amp, use an ordinary amp or amplifier to listen to the electrostatic headphones. This new 6k thing, you can cut the bargain, the price is also cheap. However, this thing has both the power amplifier adapter and the impedance adapter function, but it can also push the amp by the way. Its use is very extensive and the effect is also very good. If it is the main playing box, this product can push a lot of headphones. The trouble with separate amps, and the static amp slightly better than the tens of thousands, so this calculation, in fact, is also considered more cost-effective investment.
â–²vetro can be used in the power amplifier to push the headset, but also the role of impedance adapter, you can use the built-in 6.3mm plug inserted in the high impedance amp jack, to drive low impedance headphones to get better results. Whether it is inserted in the amplifier or the amp, you can push the static headphones, but because the power of the amp is small, it is still recommended to use the amplifier.
â–²vetro panel is very compact, the bottom is the bell terminal, used to connect the amplifier, out of the line is a 6.3 head, you can take the amp. The upper left corner is a set of 6.3/double three composite interfaces, which can be connected to a set of double three balanced cables, or two 6.3 connectors. The upper right corner is stax electrostatic interface. The middle is the impedance matching adjustment, the leftmost is 8 euros, the middle 32 euros, the right is the static electricity. Personally feel that when the amplifier is connected, the effect is not particularly noticeable, but when it is inserted in the amp, the effect of rotating this knob is obvious. The 8th European file is the softest, and the electrostatic file is the toughest. 32 is in between. Friends can try it for themselves.
â–² I pushed with my own Longquan 50A Link Adapter. Langquan 50A power itself is not large, the sound is soft, driving VETRO after driving HE500 will appear some dynamic lack. Since the electrostatic headphones I had contacted before were only Gaussian ESP950, and the 950 sound was a bit harsher, and the static style of stax was quite different and the quality was general. I was still the first contact of stax's electrostatic headphones, so it was hard to say what extent it was pushed. The 007 driven by Longquan +vetro is very soft and listenable. The performance of vocals and instruments is extremely delicate and smooth. Listening to the big establishment will feel that the low frequency and dynamics are not great, but listening to the small establishment and vocals, especially the female voice, is very nice.
▲ I also listened to the partner’s home. His power amplifier was Guan’s MA1, using 2A3 tubes. This amplifier with vetro, push hek, kk, he6, he560, k340 and other headsets have a very good performance, in addition to push k812 is actually unexpectedly not flushed, performance is also very good. Driven by this combination, 007's voice is much tougher than in my home. The resolution, sound field, and dynamics are greatly enhanced. Therefore, I personally feel that low-power stone machines equipped with vetro may not be suitable for pushing static headphones. The gallbladder is better.
When 007 listened to popular songs, the vocals were not particularly prominent. It was not like the rs1 vocals are very close to the front, the instrument was very backward, but the instruments and singers were all on the stage, but it was natural. The highlight of the singer itself, instrumental music will not steal the spotlight. 007's tolerance for tooth sound is very good, not polished, but a natural feeling of reduction. Listening to the sound of Xiao Tianliang's song, if you pay attention to it, in fact, there are a lot of tooth sounds, but you have no feeling of discomfort. This is very much like this. Since most of the Mandarin albums were poorly recorded, Liang Ayi’s song I hadn’t listened to with a head for a long time. However, this time I really don’t want to pick it. It’s really comfortable listening. No wonder the headphones are divided into two types, one is electrostatic headphones, and the other is headphones. In fact, from the perspective of high fidelity, the sound of 007 sounds very unreal, but it is unusually nice.
â–²However, in terms of low frequencies, compared with the moving circle and the flat-panel headphones, the 007 still feels a little less powerful, especially when compared with the solid and fast low frequency of the HE6. Heard that the low frequency of static electricity is generally not particularly good, and the amplifier driver may not be as good as a dedicated static amp, and it may be excusable.
Overall, 007's distinctive performance style and very toxic female voice are impressive. However, the different headphone styles of the stax family are not the same. The small partner who heard 009 says it is more elegant than the 007. A friend with a power amplifier at home can consider buying a vetro to play. Pushing a circle or static electricity is good, especially friends who are interested in static headphones but are in trouble. You can try it.
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With the rapid development of wireless sensing technology, 433 MHz wireless communication devices have been more widely used in portable devices, vehicle-mounted terminals, intelligent locks and other fields [1]. As an important part of wireless communication equipment, antenna is a key component that affects the overall performance of the communication system [2].
Domestic and foreign scholars have been exploring the 433 MHz printed antenna with high gain and miniaturization for many years. However, there are two main trends in the design of 433 MHz printed antenna by previous scholars: one is to sacrifice size to ensure high gain, such as the structural scheme in literature [3]; The other is to sacrifice gain to ensure size miniaturization, such as the scheme in reference [4].
Taking into account the effective size and gain characteristics of the antenna is the difficulty in the design of 433 MHz miniaturized printed antenna. Based on the research experience of domestic and foreign scholars on 433 MHz printed antenna, a 433 MHz miniaturized spiral printed antenna is designed based on the 1/4 wavelength monopole antenna. The simulation results show that the antenna occupies only 20×35 mm2 and the effective gain is -4.14 dB.
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