Audio Definition and 265 Threads

Let a simple concept of an audio amplifier is to be designed like this (in BJT) : CC *CE* CE * OUTPUT ... and CC acts as a buffer. Why does a buffer is required for the amplification? Wouldn't it be much more simpler if CC is being canceled out? CC = Common Collector CE= Common Emitter...

I'm doing well in my Calculus course, but I drive 15 minutes to get to class and back. I really think I should utilize this time. Can anyone recommend any lectures I can listen to while driving? I'm sure it can also really help get the concepts down. Anything would be helpful. Thank you in...

Hi, I am currently working on a little science project, I came across this page about sending audio signals through a laser pointer. http://www.i-hacked.com/content/view/162/44/ I was wondering if it is possible if I did it with an ordinary light bulb. It said that the data is...

There are many USB and Firewire audio interfaces, that have no circuitry to protect your speakers from the power surge when the computer gets turned on or off, to pass through the audio I/O system and on to your speakers, creating loud pops that can blow the tweeters of expensive monitors...

Does anyone know what audio sampling signals? Not Audio sampling but Audio sampling signals Thanks.

Hi, I have a question and I was wondering whether you might help me, because I have done a lot of research nut no clues. Just bits and pieces. Thanks ALOT Homework Statement In digital transmission, what are audio sampling signals? What is the mimimum sampling rate required...

Hi All, This is my first post here and I wanted to ask a few questions of the community that have been widely discussed in my workplace regarding the differences between using 110 ohm cable and 600 ohm cable for microphone and line level signals. Q: Firstly, is it OK to use AES/EBU 110...

Will an audio amp burn up if the speaker connected to it has a lower impedance than the amp's output impedance?

I know this is a physics forum, but someone may be able to help. I have a mini-hifi that I want to use the tape player connections from as an aux in. I've soldered a stereo cable into the connections on the hi-fi as shown in the electronic diagram. The left channel works fine, without any...

Is there any specific theory that states how we can remove noise from audio out put. I am a developer. I know no basics in terms physics about Audio, Noise . I record audio using an application in iPhone. I get lot of surrounding noise. I wanted to remove those noises. Is there any algorithm...

Hi everyone, I am a member of an educational group at my school and I proposed to my boss that we make a ferrofluid sculpture for future outreach events. She thought it was a great idea but now I have to figure out how to make it and I have no electrical experience. I would like to take an...

I've designed and constructed a guitar related audio circuit and I'm having a weird problem. When I tested the circuit at a friend's place yesterday we didnt have an amplifier with us so we used the inputs on his dvd to amplify the signal and listened to it on the TV's speakers. Today I...

If anyone could help, that would be amazing. its not homework, its a personal project i am undertaking and just wondered if anyone could give me an explanation or any help if they had any understanding of this circuit! thanks guys! Samm

I am working on a space balloon project and I wanted to send video, or pictures, back to Earth via walki talki. I wanted to know if this would work; I connect a composite video cable from a camera to the wires of one of the walki talki's microphone wires. Then on the other end take the wires...

I want to make sure I clearly identify myself as a noob. I have taken a speaker wire and spliced it 4 times throughout the length of my house and inserted an 1/8" adapter on each splice. The purpose of this is so no matter where I am at... (usually 1 of the four places) I can plug in...

Spinfoam cosmology is a fast-growing field, since it represents the application of the full LQG theory to the BB and expanding universe. In the early years loop cosmology addressed a restricted model with just a small number of degrees of freedom. Going from oldfashioned LQC loop cosmology to...

Hi all. Ive lurked around these parts for some time. This is my first but I am sure not the last time I'll be inclined to post here. I came across a reference recently to the Duff-Smolin debate, which was apparently once hosted at this url...

Hi, I am a first year PHD student in physics at a top ten university. I finished my undergraduate degree at a Liberal Arts college (hence, my degree was a Bachelors of the Arts) in math and physics. I didn't do too poorly during my first semester (I got a B average), but I decided that I want...

Can someone explain the difference between audio format and codecs? wikipedia says this: A codec performs the encoding and decoding of the raw audio data while the data itself is stored in a file with a specific audio file format. I don't get this. lets says 1000 1111 is the digital...

Silent Healing http://www.wds-global.co.uk/products/silenthealing.aspx Here is an incredible hoax to debunk. I will need a little help with the maths, just. See below. Background, see the link. This expensive audio CD contains - yes, 74 minutes silence! :-) Even in four different, named...

I have to hook up two audio amplifiers to one audio source. According to the instructions I've been given, I need to build a resistive power divider/splitter with 3 Z0/2 resistors in a wye configuration to connect them. I have to admit that I don't understand why or how the power splitter...

Hi everyone, I am posting this thread just to find some information. I have a science project which try to make a compact directional sound for detecting movement. Now, the electronics which my group is developing is on a small PCB board (approximately 5x5 cm) I am wondering if...

Well the next step in my coilgun is a decent power source i every camera circuit that i use is burned up so i thought that i use a transformer well a audio transformer as the voltage multiplier but i can't seem to wire it right it actually doesn't charge the capacitors so i was wondering if it...

I have been going through some great science lectures I have downloaded from itunes U from Apples itunes store. You don't have to own an ipod to use them as they can be viewed for free on a computer. Unfortunately the sound quality on many audio and video lectures is very poor. We can take...

I have idea, audio is vibrating wave of air, we know how to make energy from movement (movement energy) very loud audio can vibrate membrane and from that vibrating we can make energy (axiom of movement energy) but that quantity of energy is minor

So I have to build a boombox using transistors as amplifiers for my Engineering Electronics class in college and it works and everything. The only thing I have a question about is I want to make my own cord to use my iphone as the audio input signal that is to be amplified. At the lab they have...

Hi all, I really enjoy reading physics books, such as Brian Green's series and books about interesting mathematical topics. I am a 3rd year mechanical engineering student so I also love reading anything related to engineering. I'd really like to enjoy more books, but I don't have a lot...

Hello all, This is my first post in this forum. Hope can get some constructive help from the community. I did some testing with some radios which is actually a double ended circuit (BTL), meaning it has the spk+ and spk- port. When I want to connect it as a single ended circuit, meaning...

hi the question is about how can I arrange a microphone such that it has a "line of sight" kind of sensitivity, only in one direction? What I've tried so far is to place a 5/8" dia tube towards the direction to be measured and the mic is at the other end of the tube. I've found in listening...

Audio ADC and DAC is needed ! I am looking for Audio ADC and DAC. Anyone can give their advice on choosing these two converters? I am planning to convert the Analog audio to Digital Signal (vice versa) in 10 – 16 resolution bits and fs max will be 44.1kHz. what is the different between...

Hi folks, I'm wanting to buy a PS3 but have nowhere to plug in my audio except through a 5.1 system that's already being used by my PC. So, I decided to make a little box to wire up the two together and switch between them. But I'm having trouble with the switch... here's a nice picture in...

Hi, all I've been reading these forums for a while, and now that I have a question, I've finally decided to join. The question I have is school-related, but not really direct coursework since it's very open-ended. I am part of a group (in electronics class) that is building an LED...

Hi, I'm trying to understand digital audio on my own for brain modelling research (i'm trying to wire up input to neuralnet, which I've done with a vision component using a camera). [edited...] i forgot to mention that the ultimate goal is to have microphone input and speaker output. I've...

Not sure if this belongs in this forum, its subforums or engineering. Thanks for reading, the post is long. Any suggestions would be grateful. ------------------- Application Field: Brain Modelling Topic: Audio Analysis then Audio Synthesis OS: Microsoft Windows, IDE: MSVC (unless the package...

I'm logging the RPM of a scaled wind turbine using a laser and modified microphone (with a photocell instead of a coil). The signal is recorded using Audacity and is a series of troughs separated by the time it takes for one blade to pass through the beam (please see attached image below)...

Will an audio transformer pass multiple signals at the same time to the secondary winding. For example if there is 200Hz 300Hz and 1000Hz on the primary winding, will there be 200Hz 300Hz and 1000 Hz on the secondary. In my opinion it will but I just wanted to confirm this.

I have a first generation Apple iTouch 16 GB, and frequently download podcasts to watch and listen to. With over 1 million applications written, I have searched in vain to locate an application that will allow you to launch a video, and instead of displaying video and audio to suppress the...

Could anyone explain how to analize an Audio Amplifier so it can have good sound output. Thank you in advance

Hi, Does anyone know where I can find the audio version of the "Feynman Lectures"?? I know not all of them are taped, but most are, I can't seem to find them anywhere. Help! Thanks.

There are some helpful courses and lectures related to mechanical engineering available on the Internet. http://www.infocobuild.com/education/audio-video-courses/mechanical-engineering/mechanical-engineering.html This contains audio/video courses and lectures in mechanical engineering...

I've been in a very history of physics mood lately and have been rediscovering Feynman. I was watching the Nova special from after his death and SJMF was typed out from audiotapes of Feynman telling the stories. Does anyone know if there is anyway to get a hand on the original version as read by...

I'm very pleased to share this site containing many links to audio and video lectures in electronics and electrical engineering from educational institutions around the world such as MIT OpenCourseWare, UC Berkeley Webcast and NPTEL Courses...

Hey everyone! I recently bought a iPod nano (yah!) and an itrip (double yah!). For those long trips I was hoping to find some audio files I can listen to. I would also be interested in how to make my own. That's it. Thanks in advance!

First of all, I'm not an electrical engineer. I'm just a software developer who has written an application to do push-to-talk over wireless LANs on Windows Mobile devices, mostly for warehouse environments. We've got a prospect right now who wants to run our software on some forklift terminals...

The following site provides a good collection of links to audio/video courses and lectures in physics from educational institutions around the world. http://www.infocobuild.com/education/audio-video-courses/physics/physics.html The courses and lectures include general physics, classical...

Hi all, I'm having some trouble understanding the consequences of directly changing the frequencies in the spectrum of an audio signal. Let me give you an example: Let's say I have some audio signal, which I convert to a spectrum (in LabView, using a direct cosine transform (to avoid...

Hi Just have a quick question, for audio input (AUX) into speakers would it be possible to make a powerless radio receiver plug in, or would it require power? Thanks

Hi, my car audio keeps going on and off, on a weekly basis. Meaning for one week, it would play perfectly and for another week it would not function properly at all, in a sinosoidal fashion. I don't want to spend and buy a new radio, but is there anything I can do to break this pattern without...

If you have ever seen the benchmark of an audio video receiver, you will see how the power drops off as more channels are driven at the same time. For example, a benchmark done on my receiver, the Yamaha RX-V3900 showed 189 watts into one channel, and only 88 watts into seven channels. Is...

Hey guys, I'm not an Electrical Engineer, which is why I'm here asking for your help! I have a car audio system I am building and installing my self, and I have one specific question. I am planning on having a 60 watt (RMS), 2 ohm speaker powered by a 90 watt (RMS @ 2 ohms) amplifier, and I...