Hand loudspeaker generator
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Electric motors and generators
Operating principle. The circuit is a self-oscillating generator operating at the natural resonance frequency of the loudspeaker suspension system.
Since the resonant frequency of the woofer is Hz, in order to lower it, you just need to make the suspension system heavier. To do this, in the center of the diffuser, it is necessary to glue a spiral of solder weighing about 20 - 40 grams, then the resonant frequency decreases to Hz.
It all depends on the brand of the speaker, see the parameters in the internet. The schematic diagram is the simplest self-oscillating generator, which is started from the speaker coil, I assembled it in the fifth grade, when I was making speakers. Actually, this relay is needed to "push" the speaker and turn off, then the circuit works at the resonance of the speaker coil.
Transistors - any low-frequency medium power, necessarily on radiators I took two bottoms from aluminum cans from under the Cola. Power supply - a 9V beep from the killed modem. Resistors R1, R4 - volume control - the circuit operates on a pendulum resonance, and although an electrician consumes about two watts, the output is at least twenty, and the speaker goes wild without them. The speaker is basically any woofer, I have an ancient 10 GD 10 W, with a 4 Ohm coil, the resonant frequency of the suspension is 80 Hz.
It must be installed in the housing to avoid an acoustic "short circuit". The body is a children's plastic bucket. I cut off the ears of the speaker with a jigsaw, stuck it in a bucket and glued it with Moment around the perimeter. First, you need to assemble the system on a table and check the electrics, at first without a weighting agent; when the power is turned on, the speaker should hum at the resonance frequency.
I earned it from a half-stop. If it doesn't work, play with the capacitor. Since I could not find a normal frequency counter, I tuned the "fear frequency" of 13 Hz with an oscilloscope and a LF generator according to the Lissajous figure. To do this, I fed 26 Hz from the generator to one input of the oscilloscope, and the other - wires from the speaker, Then, in order not to get under the infrasound, I covered the bucket, turned on the power for five seconds and looked at what happened.
Then he turned off the power and began to cut off the spiral of the weighting a little bit until he got a double Lissajous. That's all. I don't post a photo - a bucket is a bucket. PS: By the way, I still have one more column.
This weekend I will try to reduce the size to a minimum, assemble the system in a mini-case with a bass reflex, put it under the hood and test it on the very first traffic cop. How it goes - I'll post it New on your site.
I also have torment. Above me and my wife were two girls who looked like hell, I can't understand what they are doing in life - they get up at 13 - 17 o'clock a stamping sound and an alarm clock are heard , and then house-style swotting begins, sometimes for 7 hours in a row! They go to bed at 10 am! I can't understand. My wife and I wrote a note, it didn't help, we went to them three times, they say we just want to talk, without blood - they only look through the peephole, do it quietly and after half an hour everything is the same.
He knocked on the ceiling with a sledgehammer and on the batteries, but this only embitters them and they make them louder and stomp their feet in revenge I can't understand such I was once reproached by a neighbor myself long before the girls appeared in a loud drunkenness, so I felt so ashamed that I was violating the comfort of other people, their right to sleep Then he hid.
Injected eggs into the upholstery. The eggs did not help - there was no stench. Broke an egg into a glass and started watching and sniffing it every day. It just evaporates!! There is less of it in the glass and there is no stench! Xs how to make it go bad, then to drive it into a syringe. I keep him warm and in the light. There is some air in the syringe for all kinds of decomposition reactions. And now about the sound. Generated seven sounds in Sound Forge, each for several hours in duration.
Several sounds with frequencies of 20 - 40 Hz with filters and amplitude modulation in Hz. Several high-frequency kHz with filters. One sound where one channel is low pulsating frequencies, and the second channel is high frequency squeak. These sounds do not have a super effect and so on, but they can spoil the mood greatly the wife heard a squeak, her eyes went up to her forehead. When pressed against the ceiling or better, the junction of the non-bearing wall and ceiling, in the morning and afternoon silence, they will have a certain resonance and reach the addressee.
Another advantage is that it is impossible to understand where the sound is coming from. I arranged a test. I waited when the girls from above leave, then he pushed everything to the ceiling, turned it on in full, closed the doors in the rooms, went out to the stairwell and began to listen. I listen to my door - it seems from there. I listen to the neighbor's door on the right - and we can from there.
I turn my head - maybe from the elevator Now the ethno business is ready, I am waiting for a reason, so to speak, to run over according to concepts, and not according to lawlessness. They have not been making noise for 4 days. As soon as possible, from 7. These complaints, as well as the constant damage from vandalism in toilets, prompted the district administration to conduct a scientific experiment. Experience has shown that people from 30 to 50 years old cannot distinguish high-frequency sound, which reminds them of the noise in a train carriage.
At the same time, the students pinched their ears and tried to move away from the sound source as quickly as possible. As if someone scratches a blackboard with a fingernail," a year-old schoolboy shared his feelings. Three years ago, "Adult Inaudible Sound" became available for download on Japanese cell phones.
According to one of the companies that sell sound to users of cell phones, in just one year it was downloaded to mobiles more than thousand times. For the protection of public order, an apparatus using "anti-adolescent" sound is used in Japan for the first time. In the UK, we recall that local developers of a unique source of disturbing ultrasonic interference last year started production of the second model of such a device, called the Mosquito GSM.
The first model appeared there a year earlier. The buyers of the devices are not only police departments, but also representatives of transport companies, shops, banks and municipal authorities. All of them are interested in discouraging socially dangerous youth from crowded places and important urban infrastructure.
Such a device costs about a thousand dollars and has a range of 15 to 20 meters. All you need to do is start using Mosquito, and the profit of the outlet will certainly increase, and theft will decrease, according to Simon Morris, Chief Commercial Officer of CSS.
In one of the firms he was told that thanks to the new development, their profits in the first week alone increased by 6 thousand dollars. Arriva trains, Northern Rail and Chiltern Railways have also invested in Mosquito, along with several police departments, including those in London. Distributors of the new product from JNE Marketing say they have already opened offices to advise on the use of Mosquito throughout the country.
Dear admin, I tried to make the woofer diaphragm heavier, however, not in your circuit, but simply by connecting it to the low frequency output, the speaker wheezes, squeaks, a lot of harmonics and distortions, but it doesn't work out.
Perhaps you need to use some special speakers or piezoelectric emitters, if yes, what brand, tell me. And yet, is it possible to embed a microphone in a circuit instead of a relay, as a sound source? The fact is that with a relay this is a one-time action, and by inserting a microphone, you can carry out suggestion on the subconscious and not go up times a night, do not put the device out the window in bad weather, rain and snow, but give instructions to drunks not to return to our yard and tell all the familiar bruises not to come here.
The lower the sound frequency, the more internal volume is needed for the case in which the speaker is installed. The dimensions of the diffuser should also be small. In his youth in the Soviet Union, the speakers were produced AS There, on the "bottom" there were speakers with a metal diffuser, burdocks with a diameter of more than 50 cm.
From them, infrasound could be obtained. Infrasound cannot be focused, it spreads in all directions. Think of a subwoofer from a home theater system, where you don't put it everywhere in the room mumbling everywhere.
There is a section in physics, called acoustics, I recommend reading. It does not have to be focused, it is enough to create it at a certain point. For example, two intersecting beams of ultrasound.
They are focusing. Apply two ultrasonic phasing gratings, the radiation of which differs by the frequency of the required infrasound. Direct them at an acute angle, to a certain intersection point. At the point of intersection, due to interference, we get infrasonic beats. The method, quite often, is found on the Web, and not only for ultrasound.
At home, on the mezzanine, there were two old self-made speakers. In the evening I hung the structure out of the window and turned on the power. Five minutes later, the drunkard licked her tongue like a cow.
Now, as the noise rises, I turn on the scarecrow for a couple of minutes. In the courtyard - peace, quiet and God's grace.
N29TF Portable Hand Crank Generator Solar Dynamo FM AM Radio With Flashlight MP3 Player
JBL is an American audio equipment manufacturing company that makes a wide range of remarkable audio devices. It offers excellent sound quality through some of the best JBL Bluetooth speakers. You can find party speakers, compact and lightweight speakers, and ultra-portable mini speakers from the range of Bluetooth-operated speakers by JBL. These wire-free speakers are convenient to move around and travel with. You can use them by connecting them to your Bluetooth-enabled smartphone, tablet, or other compatible devices. The JBL signature sound is produced in all directions through the degree speaker array models.
Loudspeaker
The schematics shown here are idealised, to make the principles obvious. For example, the animation at right has just one loop of wire, no bearings and a very simple geometry. Real motors use the same principles, but their geometry is usually complicated. If you already understand the basic principles of the various types of motors, you may want to go straight to the more complex and subtle cases described in How real electric motors work , by Prof John Storey. The two forces shown here are equal and opposite, but they are displaced vertically, so they exert a torque. The forces on the other two sides of the coil act along the same line and so exert no torque. Note the effect of the brushes on the split ring. When the plane of the rotating coil reaches horizontal, the brushes will break contact not much is lost, because this is the point of zero torque anyway — the forces act inwards. The angular momentum of the coil carries it past this break point and the current then flows in the opposite direction, which reverses the magnetic dipole. So, after passing the break point, the rotor continues to turn anticlockwise and starts to align in the opposite direction.
Robot or human?
Eck, Cathy van. New York: Bloomsbury Academic, Bloomsbury Collections. Copyright Cathy van Eck You may share this work for non-commercial purposes only, provided you give attribution to the copyright holder and the publisher, and provide a link to the Creative Commons licence.
DIY: Generate Your Own Electricity
When a wire carrying an electric current is moved in a magnetic field of a magnet the magnetic field induced by the wire reacts with the magnetic field of the magnet causing the wire to move outwards. Fleming's left hand rule helps you to predict the movement. F irst finger - direction of magnetic f ield N-S. Thu M b - m ovements of the wire. The magnet field of the coil pushes away from the magnetic field in the surrounding magnet, so turning the coil and the motor spindle. Dynamos - use magnets, a coil and movement to produce electricity in exactly the opposite way to the motor.
NTI AUDIO MR-PRO MINIRATOR SIGNAL GENERATOR - Analogue audio
When you have installed this app, you will get a variety of test signals that can be used with our AudioTools app. These can help you check speaker polarity, delay, and EQ to optimize your surround audio experience. Signals are currently available in Dolby 5. Apple TV 4K is required for Atmos signals. Select one single loudspeaker channel, route the signal to all channels, or activate a cycle to move the signal around the room.
Headphones, which contain small loudspeakers, use the reverse effect to microphones - the motor effect. In these devices, variations in an electric current cause variations in the magnetic field produced by an electromagnet. This causes a cone to move, which creates pressure variations in the air and forms sound waves. Alternating current supplied to the loudspeaker creates sound waves in the following way:.
Display all pictures. This product is no longer in stock. Availability date:. Please note: the standard and expedited shipping costs are only estimates. The actual shipping price will be shown on the order page. By buying this product you can collect up to 2 loyalty points.
Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Ferroelectret nanogenerators were recently introduced as a promising alternative technology for harvesting kinetic energy. This electromechanical coupling, combined with their flexibility and thin film-like form, bestows dual-functional transducing capabilities to the device that are used in this work to demonstrate its use as a thin, wearable and self-powered loudspeaker or microphone patch.
A loudspeaker or speaker driver , or most frequently just speaker is an electroacoustic transducer , [1] that is, a device that converts an electrical audio signal into a corresponding sound. The speaker driver can be viewed as a linear motor attached to a diaphragm which couples that motor's movement to motion of air, that is, sound. An audio signal, typically from a microphone, recording, or radio broadcast, is amplified electronically to a power level capable of driving that motor in order to reproduce the sound corresponding to the original unamplified electronic signal. This is thus the opposite function to the microphone , and indeed the dynamic speaker driver, by far the most common type, is a linear motor in the same basic configuration as the dynamic microphone which uses such a motor in reverse, as a generator.
Attendance is good