Asked in Cars & VehiclesCar HornsBrass InstrumentsFrench Horn
Cars & Vehicles
What is a horn diaphragm?
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Asked in Car Horns
How does a Car horn produces sound?
Answer 1 A car horn produces sound by using electrical energy to viabrate a diaphragm inside the horn which sets up pressure waves in the air, thus becoming sound when heard. The horn diaphragm's creation of sound waves is similar to the way a speaker diaphragm converts electrical pulses from an amplifier into sound, except that the horn is designed to produce only a single frequency of sound, whereas the speaker can produce many different frequencies.
What is wrong with my horn on my 1987 mustang it clicks?
Vehicle Horn "Clicks" First, you need to understand how a horn works. Vehicular horns are "similar" in operation to an audio speaker in that they have a diaphragm [metallic in horns] which moves in and out very rapidly to create a sound wave. To cause the movement, there is a "coil" of Copper wire [usually around a "soft" iron core] which when energized pulls the diaphragm toward the coil/core. When the electricity is turned off, it allows the diaphragm to return outward to its resting position. The horn "button" on the steering wheel usually feeds power to a "relay" which then feeds full battery power to the horn itself. The ON-OFF at a very rapid rate is controlled by a set of "points" inside the horn. One point is fixed, and the other "rides" with the moving diaphragm This setup allows the electrically charged coil to pull the diaphragm backward from its resting position, then the movable switch contact point is simultaneously "opened," cutting off the electrical power to the coil and de-energizing it, allowing the diaphragm to return to rest position, which closes the contact point starting the cycle again, and again, and again... When a horn "clicks," the cause is usually the fact that the contact points have an accumulation of electrical "arc" debris [or the points have "welded" together] which prevents the points from being able to open and release the diaphragm Most vehicular horns have an "adjusting screw" [with a locking nut] on the back of the horn. By loosening the locking nut with a small wrench, and then screwing the adjusting inward a couple of turns and then back out those couple of turns [plus a couple more] several times, the debris/corrosion [or whatever it is] usually falls off the points, and the horn will work again. NOTE that the horn sound output may not sound the same, and you will have to "tweak" the sound by "playing" with the positioning of the adjusting screw. When you have got the sound back similar to original, hold the adjusting screw in that "best" position, and re-tighten the locking nut to secure the adjustment setting.
Asked in Car Horns
How does a car horn work?
From While some modern car horns are actually specialized computer audio systems, the old-fashioned electromagnetic car horns are still common. An electromagnetic horn uses an electromagnet to attract a steel diaphragm and turns that electromagnet on and off rhythmically so that the diaphragm vibrates. In fact, it uses the diaphragm's position to control the power to the electromagnet. Whenever the diaphragm is in its resting position or even farther from the electromagnet, a switch closes to deliver electric current to the electromagnet. The electromagnet then attracts the diaphragm's center. But when the diaphragm moves closer to the electromagnet, as the result of this attraction, the switch opens and current stops flowing to the electromagnet. Because of this arrangement, the diaphragm moves in and out and turns the electromagnet off and on as it does. The diaphragm's tone is determined by the natural resonances of its surface.
Asked in Biology, Botany or Plant Biology, Genetics
What is a Difference between diaphragm and membrane of diaphragm cell and membrane cell?
Asked in Consumer Electronics, Inventions
How do phonographs work?
A phonograph works by collecting sound in a horn that is attached to a diaphragm. The sound causes vibrations in the air that travel down the horn causing the diaphragm to vibrate. The diaphragm is connected to a stylus and pressed into a cylinder covered in wax (or alternatively a thin layer of tin foil). When a handle is turned, the cylinder rotates and also moves very slowly along. The stylus pushes into the wax and, when the cylinder is rotated, cuts a groove. The stylus also moves up and down very slightly as it vibrates with the sound and so the wax now contains a recording of the sound in the groove. We play the sound back by using the stylus to translate the groove back into vibrations onto the diaphragm and this in turn to the horn from which the sound can be heard. Although the phonograph idea is simple enough it was a triumph of engineering. The movement of the cylinder and groove need to be very accurately aligned in order for the machine to work at all. This is a difficult thing to do and requires precision engineering!