You can do without wires using modern technologies. These include wireless transmission of a sound signal, which is based on the use of a laser and LED.
What is needed to work on this device.
– ferrite ring;
– resistance rated 200 Ohm;
– standard LED;
- the wire;
– lantern box;
– batteries or accumulators;
– Jack input connector.
– photocell.
First, we remove the photocell from the garden lamp and remove all the elements except the main part with the wires. We connect the jack connector to them.
For the transmitting device you will need a ferrite ring, copper wiring from 0.5 to 0.8 mm. The thickness of the wire should not be reduced, otherwise the sound quality of the receiving device will be distorted.
On the above ring we will then wind two windings. The primary will consist of 20, and the secondary, respectively, of 35 turns. It must be said that the number of turns for the secondary winding is not critical; you can increase the number of turns and this will not affect the quality of operation of the device. You can also make separators on the ring that will limit the possibility of the windings moving. Overlapping of turns should not be allowed. They should lie close to each other. Don't forget to also remove the insulation from the ends of the wire that will go to the winding.
After this, you need to take the body of a small table lamp or another, in which you can place the elements of the structure being created. It is desirable that the body that will act as a donor be flexible.
Assembling a device for wireless sound transmission.
Contact + batteries or accumulator will be connected to + LED. Contact – from the power source we connect to one of the ends of the secondary winding. We connect its other end to a 180 Ohm resistor. We connect the second end of the resistance to the contact – LED. We connect the primary winding to a wire with a Jack connector. It will be inserted into the audio output jack. To provide stereo sound, the left and right channels on this wire must be combined into one.
You can transmit sound over a distance not only through wires, but also using a conventional laser or LED. We suggest you find out how to do this in this review.
We will need:
- ferrite ring;
- 200 Ohm resistor;
- Light-emitting diode;
- copper wire;
- flashlight housing;
- batteries;
- photocell from a garden lamp;
- wires;
- 3.5 mm headphone jack.
The first step is to disassemble the photocell from the garden lamp and remove all its components, leaving only the element itself with two wires coming from it. You need to connect the input jack from the headphones to the low-frequency amplifiers to these wires.
Next, we take a ferrite ring, which, according to the author of the idea, can be purchased for 20-30 rubles, and a copper wire 0.5 - 0.8 mm thick. Please note that when using thinner wires, the transmitted sound will be of poor quality. Two windings need to be wound on the ferrite ring. The primary winding should consist of 20 turns, and the secondary winding should consist of 35 turns. Note that if desired, you can wind more turns, especially on the secondary winding.
Let's move on to the assembly. The positive contact from the power source must be connected to the positive contact of the LED. The negative contact from the power source must be connected to one of the wires on the secondary winding, not forgetting to remove the insulation from the copper wire. We connect the second wire on the secondary winding to a resistor. And we connect the second end from the resistor to the negative of the LED.
The primary winding should be connected to a wire with a 3.5 mm connector. Finally, we connect the wire from the headphones to the sound transmitter and insert its tip into the smartphone.
Our system is ready. We turn on the music on the smartphone and make sure that the LED light is aimed at the photocell. Enjoy the sound.
We transmit sound wirelessly and without a radio channel. Over the course of a week I have been conducting tests on wireless transmission of an audio signal. The method of transmitting sound over short distances (up to 15 meters) is quite simple if you use a laser emitter. Today I want to tell you specifically about transmitting sound over distances using a laser beam. To assemble the structure, we need very little - an audio signal source (music center or mobile phone), a ferrite ring, a resistor from 15 to 47 ohms and a battery from a mobile phone.
To receive an audio signal, we need a photodiode and a low-frequency amplifier. Two windings need to be wound on a ferrite ring, the primary winding has 20 turns of wire with a diameter of 0.5 millimeters, the secondary winding has 30 turns of the same wire.
The primary winding must be directly connected to the audio signal output. We connect the minus of the battery to one of the ends of the secondary winding, and connect the plus of the battery directly to the plus of the laser diode.
We connect the second end of the secondary winding through a 15-47 ohm resistor to the negative of the laser diode (any laser diode will do, for example, from a CD or DVD player), it is advisable to use a laser pointer, which can be purchased in a store.
The photodiode, which serves as an audio signal receiver, is directly connected to the input of the power amplifier. Next, turn on the music and direct the beam to the photodetector and voila! The sound flows through the laser beam to the receiver and the power amplifier amplifies the weak signal and as a result we get fairly high-quality sound. Instead of a laser, you can also use an ordinary LED, but in this case the transmission range of the sound signal will be no more than 30 centimeters; it is advisable to use white or ultraviolet LEDs from lighters. When using a laser pointer, it is possible to transmit an audio signal over a distance of up to 15 meters, and note that the sound quality is quite good.
The transmitted sound is quite powerful at a distance of 7 meters, the amplifier at full volume delivered 80 percent of its power to the load. Such a device has found very wide application in science and technology; laser microphones for espionage are based on precisely such a transmitter and receiver.
This device is an excellent accessory for a computer, imagine music is playing on the computer and the power amplifier is not connected by cable to the computer, friends will be shocked when they see this miracle, you must agree that it is a truly wonderful device, this way you can also transmit a conversation, you just need to apply a signal to the input of the device from a microphone (with a pre-amplifier) and as a result we get a cordless phone or a walkie-talkie, or an excellent bug for short distances; later I’ll tell you how to transmit sound over longer distances in the same way.
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The gun's master oscillator is set to a frequency of 60-65 kHz; for 400 volts, the secondary winding contains 80 turns of wire 0.2 -0.6 mm. The winding is wound in 2 layers of 40 turns. Several layers of adhesive tape or electrical tape can be used as interlayer insulation.Therefore, when a colleague asked me to help him bring the Bluetooth speakers he liked from the USA, I agreed without hesitation. So, as a contender for the laurels of a recommended wireless audio system under $300, we had a chance to review a product from Edifier - the Spinnaker E30 wireless stereo system.
The company, known to us until now exclusively as a noteworthy manufacturer of wired speaker systems, with the release of Spinnaker began to share the niche of wireless solutions with such products as Klipsch KMC 3, Creative ZiiSound, Bose SoundLink, Jawbone Jambox, Samsung DA-E670 and many others.
At the same time, despite the presence of famous brands in the list of competitors, none of us had any prejudices regarding Edifier’s Asian roots. Still, the equal sign between “made in China” and “g#% but” has long been crossed out by good products in the wire sector. Moreover, at first glance it becomes clear that the build quality here is pretty good.
There was no burning sensation in the pelvic area, even when we placed the spinnakers next to the “reference” B&W Zeppelin Air; everything was assembled soundly and conscientiously. And, as you can see, there was a lot to collect - the design of the speakers is at least unusual.
Tusks, fangs, horns - whatever associations the guests may have, but the sea wolves know that the spinnaker is, in fact, one of the sails of the yacht. Forty-centimeter speakers covered in black silk fabric definitely look aggressive, and a pair of Spinnakers should fit perfectly into a modern interior.
Let's pay tribute to fashion, a few words about the configuration. After opening numerous packages and boxes, there was a decent pile of wires on the table, because the kit includes: a connecting cord for communication between the speakers, an optical audio cable, a 3.5 mm mini-jack, an RCA cable and a remote control with a standard microUSB-USB cord for it.
To be honest, such an abundance of wires for seemingly “wireless” speakers is discouraging at first, but in reality only two cables are enough - power and a 6-pin connecting cord between the speakers. You get the rest of the cables as a bonus and will certainly not be superfluous in your household.
The presence of mini-jack and optical cables already indicates that the speakers can be connected to the playback source in the good old wired way, for which an Aux IN/Opt IN port is allocated on the connector part of the right speaker.
The attentive reader will notice the Sub (Line) Out port, designed to connect an external subwoofer, which, to be honest, would be very useful for a pair of Spinnaker sails. But the “wired” connection is more of a nice bonus than the main purpose, which lies in the wireless plane.
The pairing procedure via Bluetooth is absolutely standard: wait for the blue diode at the peak of the right speaker to blink and wait a couple of seconds until the Secure Simple Pairing procedure connects the two devices without entering any PIN codes.
As soon as the transmission of sound to an external device is activated, the volume will become adjustable using the included remote control, whose button on the top end acts as a Play/Pause switch, and a long tap switches the input source (bluetooth-line_in).
The remote has a non-slip base and a backlight to help you find it in low-light conditions. Unfortunately, the backlight with its brightness level only reflects the charge level of the internal battery, but does not allow you to understand what sound source mode (Bluetooth or Line In) the audio system is in.
But no matter what happens to the ergonomics and behavior of the remote control, the most important thing in the speakers is still the sound. From this point of view, Spinnaker can be viewed as the owner of three emitters in each speaker, connected according to the tri-amp scheme!.. But this is what they write in the press release (very filled with technical details, by the way), we will describe the subjective perception of the playback quality because describing high audiophile matters in a system made of plastic, and even in an “art” format, is a questionable matter.
The overall impression of listening to compositions of various musical genres can be assessed on a ten-point scale of 7 points. Perhaps it’s not for nothing that 3 pairs of emitters in the speakers are equipped with their own channels from the amplifier. On the other hand, we would not label this sound “crystal,” as they say in the press release.
The Spinnaker E30 may not boast a record volume reserve, but at volume levels up to 90% the sound did not become hoarse, and the tracks were played back without audible distortion.
The lack of deep bass, as, for example, in the KMC 3 and Zeppelin Air, is attributed to the lack of a large diffuser, which simply did not have enough space, sacrificed to the god of design. The largest speaker, responsible for low frequencies, is directed downward and located at the base of the speakers. Thus, there are already two “subs”, but their small size will not make your floor vibrate.
However, if you have an old sub from any other system lying around, then try connecting it to the spinnakers; such a symbiosis should satisfy both you and your neighbors.
The strong point of spinnakers, of course, is the “not crushed” mid frequencies and the overall sound balance. If for the same Klipsch KMC 3 the crystal ringing of the upper frequencies can even be considered a disadvantage, here the highs are clearly audible without annoying protrusion.
Let's not forget about the possibility of stereopair diversity. Still, stereo sound from speakers living in the same housing turns out monophonic at a certain distance from them. By placing a pair of speakers on opposite sides of the table, we got a very spacious sound picture, without having to put up with the sensation of sound coming from one point.
The bottom line is an aggressive and memorable design, an unusual remote control and decent sound with the possibility of stereo diversity. I think that all this will definitely be useful on the farm. In addition, a connector for connecting an external subwoofer will smooth out the lack of bass for those who will sorely miss the built-in woofers.
There are a couple of questions about the ergonomics of the remote control and the arrangement of the cable holder in the aluminum base of the speakers, but it is enough to select the most comfortable location for them once and for all to forget about the hassle with wires.
The answer to the question “can the Spinnaker E30 be recommended in the price segment up to $300?” will be “yes,” if the above-described disadvantages are not critical for you. For a friend, this system cost Amazon $279.99 + $55 for delivery, but in Russia the retail price for the Spinnaker E30 ranges from 11-12 thousand rubles.
Speaking of its closest competitors, we can note the Creative ZiiSound D3x + DSx set, which wins in the lows due to the presence of a full-fledged sub, but in the upper and middle parts a drawdown is felt. Top-shelf Bluetooth speakers, of course, are more expensive, and sometimes much more expensive, so is it worth overpaying for a brand when you can get decent sound quality and a memorable appearance right now?
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Many of our readers are familiar with the term “convergence,” which implies the interaction of different digital devices with each other. Indeed, who in the modern world needs devices that cannot exchange information with each other? But there is also the other side of the coin: the more devices that provide our digital leisure, the more wires we have to endure in the apartment. Every electronic device requires power supply, there is no escape from it. In addition, wires are required for devices to communicate with each other. So, say, a DVD player has to be connected by cable to a TV, a stereo system to speakers, a computer to a monitor, and so on. Usually in an apartment you can count a dozen different cables, or even more. Even in order to listen to music not on the computer, you have to lay wires! But it is not all that bad. Quite a lot of devices have already appeared on the market that allow you to enjoy music anywhere in the apartment without the annoying wires everyone has.
Music without wires
Traditional cassettes and audio CDs are gradually giving way to MP3 files and other audio formats. Indeed, today any player “understands” different compressed audio formats, which previously could only be played on a computer. And the computer itself is gradually becoming a music repository, sending racks of discs to a well-deserved retirement. The computer has truly become the center of the “digital universe.” But a problem arises: how to listen to music from a computer on household appliances? It is unlikely that you will like, for example, recording music onto a CD and then playing it on a music center. And laying a web of wires is also not the best solution.
Today, solutions have appeared on the market that allow you to transmit music wirelessly. As a rule, they consist of a transmitter that connects to a computer via a USB interface, and a receiver that is connected to a music center. Sometimes the receiver contains an amplifier and allows you to directly connect speakers, for example, 2.1. Music is read from the computer and transmitted to the receiver without unnecessary wires. There are also mobile solutions that combine speakers and a receiver in one housing. The choice is quite extensive; you can buy a similar system, focusing on the criteria of quality, mobility and size. If technology allows, then you can listen to music even in the courtyard of your house.
Most often, wireless communication uses the 2.4 GHz frequency and supports a range of up to 30 meters. Many companies rely on proprietary communication technologies that require no configuration and work immediately when you take the receiver and transmitter out of the box and turn them on.
Some equipment relies on standard technologies, such as Bluetooth. With the advent of version 1.2, the range of Bluetooth communication has increased to 30 meters (up to 100 meters with line of sight). There will be no connection problems here either, since the transmitter and receiver are usually sold as a set. A Bluetooth connection is created automatically once the receiver and transmitter are turned on.
Another option is a WiFi network. In this case, you will most likely buy only a receiver. For such a connection to work, an existing WiFi network is required. As a rule, such products provide the widest range of capabilities and functions.
Finally, you can transmit music over the regular electrical network that is already installed in your home. Installation is also simple and should not be difficult. Simply plug the receiver and transmitter into a power outlet.
Apple products are always a pleasure to test. This manufacturer is always trying to offer products that are distinguished by certain innovations.
Airport Express is a cross between a computer accessory and consumer electronics. In addition to transmitting sound over a WiFi network, the device works as a wireless access point and even allows you to connect a printer. The Airport Express base is very compact. If you want to use the base as an access point, for example to connect your computers wirelessly to the Internet, then just connect the base to an ADSL or cable modem via an RJ-45 socket.
Since there is no display on the base, configuration will have to be done through the Assisting Airport Express utility. On a computer that must be equipped with a WiFi card, you should install the AirTunes application. It can interact with iTunes, so you don't have to organize your music library all over again. The base can provide an audio signal in both digital and analogue form. The sound quality is simply amazing. There are no delays or pauses felt. The Airport's range meets WiFi specifications, which means it's just enough for an apartment.
There are no control keys on the Airport Express. Therefore, to change the music you will have to turn to the computer. Airport Express is an interesting universal solution that will allow you to both create WiFi networks and enjoy music anywhere in your apartment. More information is available on the Apple website at the link below. At the time of publication, the Apple Airport Express base retailed for about $160.
Devolo specializes in network devices that use electrical wiring for communication. The company uses reliable CPL transmission technology certified by EDF. The Audio dLan solution is very easy to install, as you just plug the receiver and transmitter into an electrical outlet. Then you should connect the transmitter to the PC via a USB interface or LAN network, and the receiver to headphones or a music center. The sound quality is excellent. We didn't feel any pauses or delays. And the range is one of the best in our testing. Theoretically, CPL allows you to cover an apartment of up to 200 m². The receiver and transmitter work normally, even if they are connected through an extension cord.
Communication is carried out automatically. The software is very easy to use. It is enough to install a special plugin for Windows Media Player or Winamp. Then, when the player starts playing music, it will be automatically transmitted to the receiver. Unfortunately, all operations with music (change track, pause, etc.) will have to be performed on the computer.
Interestingly, the Audio dLan receiver also allows you to transmit an audio signal to a computer. You can connect a microphone or any other source to the audio input of the receiver, which becomes a transmitter, and then record the sound on your computer. This function is very interesting, for example, for recording vinyl discs from a Hi-Fi system.
The transmission quality is excellent. We did not feel any restrictions if we stayed within the same electrical network. But the price of such a solution is quite high, and in Russia it is very difficult to find Devolo equipment.
The very compact Wireless Music System (WMS) for PC consists of two parts. The tiny transmitter resembles a regular USB keychain. A receiver, also very small, is connected to the music center. A folding antenna is built into the receiver and transmitter. For sound transmission, the receiver has mini-jack and tulip outputs. Therefore, without unnecessary adapters, you can connect the receiver to a music center or headphones. The receiver also has a power socket.
On the top panel of the receiver there are control keys (stop, play, pause, etc.), volume control and mute.
The connection between the receiver and transmitter is very simple. Simply press the "Connect" button on both modules, after which the connection will be established. As soon as you connect the USB transmitter to your computer, it will start working as an audio output. That is, all music played on the PC will be transmitted to the receiver. It is best to use Windows Media Player. Then you can control playback using the keys on the receiver.
Logitech also included a remote control in the box. The transmission system is compatible with WiFi networks and is capable of covering an entire apartment and even a house if communication conditions are normal. The transmission quality is excellent, there are no pauses or delays. If you want to stream music to several devices at the same time, you can purchase additional Logitech receivers. At the time of publication, the retail price of the Logitech Wireless Music System was $130.
The SLA5500 is part of Philips' Connected Planet line. All products in the line use a WiFi wireless network and allow you to stream audio and/or video.
The SLA5500 solution is designed for music transmission. The stylish gray case goes well with other household appliances. You can connect headphones, multimedia speakers or a music center to the case.
The SLA5500 requires a PC and a WiFI network or, better yet, a wired network to operate. Receiver setup is done on the screen using the included remote control.
As for the PC, you need to install the Philips Media Manager program, which allows you to create a music library with playlists. It should be noted that the SLA5500 also supports Internet radio stations, and you can listen to them even without a computer. Finally, online music playback in WMA 10 format is supported.
Thanks to WiFi, after the initial setup, the connection works reliably. The sound quality is good. And we were also pleasantly pleased with the range of action. The remote control allows you to conveniently control all functions of the SLA5500.
Saitek's product range is quite extensive. In addition to gaming controllers, this manufacturer also produces audio equipment. Externally, the A-250 resembles a compact cassette recorder. The appearance can truly be called stylish.
Saitek A-250 can be used as external speakers paired with a player via a 3.5 mm mini-jack input. But we are more interested in wireless capabilities. To use them, you need to connect a USB Bluetooth transmitter to your PC. No driver is required because the USB stick is recognized by Windows as an external sound card. Once connected, you can immediately send audio to it.
The A-250 receiver has a small LCD screen that displays, among other things, Bluetooth connection quality and volume. A separate power key is responsible for turning on the receiver, two keys allow you to adjust the volume, and the three remaining keys are responsible for playback and moving forward and backward to a track. To listen to music, you need to use Windows Media Player, in which you just need to create a playlist.
For such a compact design, the sound quality is excellent. Of course, it all depends on your preferences, but the A-250 can pump up a room. For power, you can connect either a power supply or install four AA batteries inside (they last for six hours). A good solution for enjoying music on the go. At the time of publication, Saitek A-250 was sold at retail for 4,800 rubles.
The Terratec Noxon system is equipped with a wide blue LCD screen, which displays the names of music tracks stored on the PC. The delivery set includes a remote control. The connectors include a power socket, USB, network and audio outputs.
Communication with a PC is carried out via a wired or wireless WiFi network standard 802.11g. The USB port allows you to connect a flash drive or player for direct music playback.
You can connect headphones, multimedia speakers or a stereo system to the receiver (the kit includes an adapter from mini-jack to tulips). There is also a digital output that allows you to connect a receiver to the receiver. Setup is relatively easy once you know your WiFi settings. The sound quality is very good, and so is the range (it complies with the WiFi standard).
On the PC side, just install Windows Media Connect and share music files. Then you can directly play music from PC by selecting the desired song on the LCD display. It is possible to listen to Internet radio stations. It should be emphasized that the Noxon system can work with DRM. Therefore, you can listen to online music in WMA 10 format.
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