Showing posts with label sound. Show all posts
Showing posts with label sound. Show all posts
Wednesday, October 29, 2014
Diagram LM 3915 Sound Level Meter Circuit
Supply voltage can be from 3V to 20V.The input is set for audio line voltage (1V peak to peak) and has a max input voltage of 1.3V. To make the circuit use a moving dot display instead of bar graph display,Pin 9 can be should be disconnected from +V.
Part List
C1 2.2uF 25V Electrolytic Capacitor
C2, C3 0.1uF Ceramic Disc Capacitor
R1, R3 1K 1/4W Resistor
R2 10K 1/4W Resistor
R4 100K 1/4W Resistor
R5 1M 1/4W Resistor
D1 1N4001 Silicon Diode
Q1 BC 558 PNP Transistor
LED1-LED10 Standard LED or LED Array
U1 LM3915 Audio Level IC
MISC Board, Wire, Socket For U1
Sunday, September 7, 2014
How to apply asphalt based sound deadening material to your car
This guide covers the basic method for applying this peel-and stick material and then tell you how, where and why to apply it.
The application of sound deadening material to your car is a very effective way to make your driving experience more comfortable. It will serve to keep out road and engine noise and keep the sound from your stereo inside the car. Asphalt based sound deadening generally comes in peel-and stick panels. This guide covers the basic method for applying this peel-and stick material and then tell you how, where and why to apply it.![]()
Applying asphalt-based sound deadener is actually quite simple. Begin by removing any interior trim panels so that you have unobstructed access to the bare metal panels that you will be applying the material to. Before you do anything else, clean the surface well using an alcohol based cleaning product that will not leave a residue. Then, start by forming the material to the contours of the surface before you remove the adhesive backing. Using a heat gun or a high-powered hair dryer, heat the material and press it into the grooves of the metal until you are satisfied that it is in full contact with the floor. This is also a good time to trim the piece to fit and cut holes for any bolts or hardware that you may need access to. Allow the piece to cool, then pick it up and remove the adhesive backing. Line it up with the contours, then place it down gently. At this point do not try to adhere the whole piece at once. Instead, use a narrow roller to work from one side to the other, pressing the piece down into every contour. It may help to use the heat gun during this process. Any air bubbles after the piece is fully adhered should be poked through with a sharp blade, and then rolled out for maximum contact. If you need extra deadening, you can layer the material as many times as space will allow.
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Trunk: If you have a subwoofer in your car, it is especially important to apply sound-deadening in the trunk. If you do it right, it will prevent annoying rattles and keep the sound pressure level from the sub from escaping through the trunk. Many manufacturers sell kits that contain a good amount of material for covering your trunk.
You should begin the application in the spare tire well and on the metal floor of the trunk. Work from one side to the other to avoid overlapping, and be sure not to cover up any hardware that will be necessary to secure the spare tire or the cargo floor. When you have finished the floor, peel back the carpet on the sides of the trunk and apply material there. If there are holes cut in the metal, you should cover these up if you do not think you will need access to them in the future. For the trunk lid or hatchback door, remove the panels to gain access to the metal inside. Apply liberally here, as sound tends to rise, but be sure that the extra weight of the material will not counteract the shocks that hold the trunk lid open.
Doors: Sound deadening the doors of almost any car will result in a noticeable improvement in sound levels, especially if your front speakers are located in the door. Not only does most of the road noise come in through the door, but the flimsy sheet metal of the door also acts as a poor acoustic surface, creating distortion in the sound of your stereo.
To counteract this, apply sound deadening to the metal inner skin of the door. You don’t necessarily have to cover everything, but be sure to get the holes and the thinnest parts of the sheet metal. The most important part of the door panels is the area surrounding the speaker. If you have enough clearance from the interior panel, apply a few layers here.
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Floor: Applying a sound deadening material to the floor of your car will probably not help make your music any louder; however it will significantly reduce road noise and allow you to hear music and people in your car more clearly.
If you are going to deaden the floor, buy enough material to cover the entire metal. This is an involved process, since you probably should take out your seats and carpet in order to gain access to the whole area. The areas to focus on here are the fenders and the surrounding metal since most of the noise comes from the tires. While you’re doing the floor, it is a good idea to apply material to the engine firewall as well. This will reduce engine noise in the cabin.
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The application of sound deadening material to your car is a very effective way to make your driving experience more comfortable. It will serve to keep out road and engine noise and keep the sound from your stereo inside the car. Asphalt based sound deadening generally comes in peel-and stick panels. This guide covers the basic method for applying this peel-and stick material and then tell you how, where and why to apply it.
Applying asphalt-based sound deadener is actually quite simple. Begin by removing any interior trim panels so that you have unobstructed access to the bare metal panels that you will be applying the material to. Before you do anything else, clean the surface well using an alcohol based cleaning product that will not leave a residue. Then, start by forming the material to the contours of the surface before you remove the adhesive backing. Using a heat gun or a high-powered hair dryer, heat the material and press it into the grooves of the metal until you are satisfied that it is in full contact with the floor. This is also a good time to trim the piece to fit and cut holes for any bolts or hardware that you may need access to. Allow the piece to cool, then pick it up and remove the adhesive backing. Line it up with the contours, then place it down gently. At this point do not try to adhere the whole piece at once. Instead, use a narrow roller to work from one side to the other, pressing the piece down into every contour. It may help to use the heat gun during this process. Any air bubbles after the piece is fully adhered should be poked through with a sharp blade, and then rolled out for maximum contact. If you need extra deadening, you can layer the material as many times as space will allow.
Trunk: If you have a subwoofer in your car, it is especially important to apply sound-deadening in the trunk. If you do it right, it will prevent annoying rattles and keep the sound pressure level from the sub from escaping through the trunk. Many manufacturers sell kits that contain a good amount of material for covering your trunk.
You should begin the application in the spare tire well and on the metal floor of the trunk. Work from one side to the other to avoid overlapping, and be sure not to cover up any hardware that will be necessary to secure the spare tire or the cargo floor. When you have finished the floor, peel back the carpet on the sides of the trunk and apply material there. If there are holes cut in the metal, you should cover these up if you do not think you will need access to them in the future. For the trunk lid or hatchback door, remove the panels to gain access to the metal inside. Apply liberally here, as sound tends to rise, but be sure that the extra weight of the material will not counteract the shocks that hold the trunk lid open.
Doors: Sound deadening the doors of almost any car will result in a noticeable improvement in sound levels, especially if your front speakers are located in the door. Not only does most of the road noise come in through the door, but the flimsy sheet metal of the door also acts as a poor acoustic surface, creating distortion in the sound of your stereo.
To counteract this, apply sound deadening to the metal inner skin of the door. You don’t necessarily have to cover everything, but be sure to get the holes and the thinnest parts of the sheet metal. The most important part of the door panels is the area surrounding the speaker. If you have enough clearance from the interior panel, apply a few layers here.
Floor: Applying a sound deadening material to the floor of your car will probably not help make your music any louder; however it will significantly reduce road noise and allow you to hear music and people in your car more clearly.
If you are going to deaden the floor, buy enough material to cover the entire metal. This is an involved process, since you probably should take out your seats and carpet in order to gain access to the whole area. The areas to focus on here are the fenders and the surrounding metal since most of the noise comes from the tires. While you’re doing the floor, it is a good idea to apply material to the engine firewall as well. This will reduce engine noise in the cabin.
Sunday, August 31, 2014
Sound operated flip flop
This is a schema which the status of the output pins of a Flip Flop IC can be toggled by using sound. A condenser microphone is used for picking up the sound.
The first two opamps in the IC1 LM 324 is used to amplify the sound picked by the condenser microphone. The third opamp inside LM 324 is wired as a level detector. When ever the voltage produced due to sound have a level more than that of the reference voltage at pin 5 of the third opamp, its output (pin 7) goes high, triggering the flip flop IC1 CD 4027.As a result the state of the output pins of CD 4027 ( pin 1 & pin 2) toggles for each burst of sound
Notes.
* The schema can be powered from three 1.5 V cells in series.
* The ICs must be mounted on holders.
* The mic M1 is a condenser mic.
* The sensitivity of the schema can be adjusted by varying the preset R9.
* Assemble the schema on a good quality PCB.
* All capacitors must be rated 10V.
Friday, August 29, 2014
Self Installation of Auto Sound System can Save Serious Cash
If you are seriously hoping to save a significant chunk of change when it comes to your auto sound system, you should consider saving on installation. Under ordinary circumstances I urge people to be very, if not overly cautious when it comes to installing your own auto sound systems. The thing is, that some people really are talented when it comes to activities such as this. Beyond talent, some people have frightening skills with electronics and if you are one of those, then by all means consider the money you could save yourself (or the extra money youd have to invest in your system?).
We all know that money doesnt grow on trees and when youve been saving up for quite a while to get the sound system you really want its a serious joy killer to have to wait another month or two in order to save up enough money to cover the cost of the installation of your sound system. If you or someone you know and trust (trust being the operative word in this instance) can do the work, it makes no sense from a fiscal point of view to pay someone else to do it.
That being said, if there are any doubts about your skill or experience you might want to at the very least get a second opinion or price installations in your area to see if it might actually be worth saving a little more. Time is another important issue when it comes to the installation of an auto sound system. It doesnt matter how capable you are of making the installation if you simply lack the time to do it. In cases such as this it would have been just as wise to go ahead and pay someone to make the installation. It makes much more sense to me than having the system sitting in a box for months on end while you wait for the time to get it taken care of.
I am one of those people who firmly believes that time is money. Time lost from work is expensive. This is especially true when the times of 10 or more people are lost. It adds up quickly no matter if you have a small or a large company. Time is also (unfortunately) the one commodity in life that you can never recover. No matter how hard you try you cannot recapture time that has been lost. If you have children you know exactly what Im talking about (particularly if your children are either teens or grown and gone). You cannot recover lost time so make sure you arent wasting your time by trying to install an auto sound system that is beyond your abilities.
Dont fret though. Most of us find that at some point in our lives we are limited by either time or money if not both. If everything was quick and easy we wouldnt really have anything worth working for would we? Consider all your limitations when planning and purchasing your auto sound system and make sure that the system you select falls squarely within your ability to install, your time limit for installation, or your price range for affording to pay for the installation. Whether you decide to do your own installation or have a professional installation of your auto sound system the prize is the superior sound quality you will be able to enjoy.
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