Questions tagged [speakers]
A speaker is a device which converts an electrical audio signal into a corresponding sound. Questions about fixing speakers will be closed as off-topic.
52
questions
33
votes
7
answers
28k
views
Why does GSM cause speakers to buzz?
Based on numerous internet resources, speaker wire acts like an antenna which picks up the transmitted signal of nearby cellphones and causes the speakers to buzz. But I'm not really buying that...
A ...
36
votes
4
answers
326k
views
Headphone wire color coding
How do I tell which wire is which if I have a copper wire, red and green coded wire? Is the unshielded copper wire ground?
10
votes
2
answers
5k
views
Where can I find specific examples of parameters for a loudspeaker circuit model?
When I look around for loudspeaker literature, I often encounter an equivalent electrical circuit model such as http://en.wikibooks.org/wiki/Acoustics/Acoustic_Loudspeaker#...
9
votes
2
answers
46k
views
Connect speaker output to microphone input
What exactly is the difference between a microphone signal and a speaker signal?
I want to make a simple cable to connect a PC speaker output to a microphone input. Does anyone have a good idea or ...
9
votes
2
answers
5k
views
Use of 100K ohm resistor along with 0.1uF capacitor?
In the circuit diagram below, why is there a 100KΩ resistor (NOT R2) connected to the capacitor? To my understanding the capacitor-resistor act as a high pass filter to block the DC offset of ...
0
votes
0
answers
193
views
Where might the noise be coming from in this speaker driver circuit?
Well, it will be a broad schematic. To summarize, there my approach is:
Yellow part is for oscilations at three different freqs(around 0.8 - 2 kHz, different for each of the three signals), ...
41
votes
9
answers
11k
views
How can "purely" electrical circuits emit sound?
Moving membranes or piezoelectric materials obviously produce sound waves, but how can "purely" electrical circuits such as transformers or DCDC choppers (and others) often have an audible noise? Is ...
21
votes
6
answers
27k
views
Why are DC signals bad for loud speakers?
I googled and found out through some forum that:
DC has a constant amplitude which overheats and destroys the voice coil of the speaker.
Could someone clarify if this answer is complete and ...
14
votes
2
answers
3k
views
Does driving a speaker with a DC offset AC signal matter?
Do these two input signals have different effects on a speaker?
An AC signal with some value of DC offset.
Same AC signal but centered at 0 V.
13
votes
3
answers
5k
views
Accidentally downmixed stereo to mono, why does this work?
I have a cheap Chinese Bluetooth audio amplifier like this:
It has four screw terminals for the speaker connections, namely L+, L-, R+ and R-. I accidentally connected a single speaker to L+ and R-, ...
7
votes
3
answers
63k
views
How to determine appropriate speaker cable gauge?
When wiring speakers to a 100W consumer-grade amplifier, how do I select an appropriate gauge cable (for 8-ohm speakers)?
Also, if 14 gauge cable is sufficient, what harm is there in using a heavier ...
3
votes
1
answer
935
views
Explain "Audio Loopback Dongle"
This AOSP/Develop/Audio page describes the following audio loopback dongle. Can someone explain it?
To ensure that the output signal will not overload the microphone input, we cut it down by about ...
3
votes
3
answers
24k
views
Max Voltage for Speaker of Given Power Rating
I have been looking into the design of loudspeaker drivers and would like to know how to determine the maximum voltage which can be delivered to a given speaker.
From Ohm's law we know that P = V^2 / ...
2
votes
2
answers
697
views
Schematics for device, which reacts to water?
After failed attempt to combine a resistive wetness sensor with a multivibrator
( How to trigger multivibrator (or similar) from collector? ), I'd like ask a direct question.
What could be schematics ...
2
votes
1
answer
1k
views
Polar pattern of typical speakers and microphones found in smartphones
I'm interested in knowing how is the directivity of the typical microphones and loudspeakers found in smartphones and tablets affected as they operate in the near ultrasound region (18-21 kHz). Near ...
2
votes
5
answers
3k
views
Any truth behind "multipole" technology in audio signal transmission?
After reading this question about ultra-expensive audio cables, I was reminded of a product that we sold at a company I used to work for.
MIT Cables makes these "audio interfaces" which go a step ...
0
votes
2
answers
233
views
Subwoofer hums when no audio source is connected [closed]
The hum stops as soon as an audio source is connected or any metal part of the subwoofer is connected to the ground of a socket.
Does anyone have any idea what the problem is?
19
votes
5
answers
6k
views
Why has my tweeter speaker burned up?
I bought a powerful tweeter (or so I thought) to experiment with the ultrasound. The device is quite heavy, and it is rated at "350 watts RMS/700 watts peak": 2'' Titanium Super Tweeter ...
8
votes
5
answers
2k
views
Amplifier speaker outputs: is the black always the chassis?
Any amplifier or A/V receiver that I have seen has a black and a red terminal for each speaker. From 2 pairs for a simple stereo system up to 7 or more for an A/V receiver.
It is quite a while ...
6
votes
3
answers
2k
views
Why am I getting heavy output distortion from a BJT amplifier when driving an 8 ohm load?
Hello electronics professionals and enthusiasts! Software engineer mingling with breadboards and discrete components in his spare time here.
I'm trying to build a simple BJT amplifier for my electric ...
6
votes
3
answers
1k
views
Troubleshooting Circuit (Make: Electronics Experiment 11)
Would someone be so kind as to help me figure out why my circuit is not working?
I am having difficulties with Experiment 11, Steps 2 & 3 in Charles Platt's book. The experiment is designed to ...
5
votes
5
answers
9k
views
Why place capacitors in front of the line to a (headphone) audio speaker?
I'm using this module based on the popular bluetooth module CSR8635
https://www.tinyosshop.com/index.php?route=product/product&product_id=875
I was wondering why, in the right-hand side of the ...
5
votes
4
answers
44k
views
What is the typical max voltage out of a PC speaker Jack?
I'm trying to use CD4051BCN chip to channel some speaker outputs from a computer. these chips handle analog voltages from +/-5V.
What is the audio line max/min Voltage coming out of the desktop PC? I ...
5
votes
2
answers
6k
views
What is the reason for adding a buffer stage?
I was following this microphone and speaker circuit and I could follow mostly but got confused when the author introduces a DAC buffer.
http://www.instructables.com/id/Arduino-Audio-Output/?ALLSTEPS
...
4
votes
2
answers
1k
views
Relation between the impedance of speaker and amplitude of sin wave?
I have an oscillator producing a sine wave with amplitude 3 V (so it oscillates between +3 V and -3 V). The oscillator is at about 500 Hz. I connected this to an 8 ohm speaker and I hear the sound ...
3
votes
4
answers
9k
views
Square wave / Sine wave is more audible
Consider you have 50 Hz both square wave as well as sine wave put on to a same speaker at different time. Which signal is more audible and what is the reason behind that ?
We know that by taking the ...
3
votes
3
answers
2k
views
Powering a 2 watt 6 ohm speaker with a 9V battery?
Im very new to electronics and what Im currently doing is my first project. I want to make a tiny guitar amp using a speaker I salvaged from an old computer speaker. The speaker says 2 watts 6 ohms on ...
2
votes
1
answer
690
views
What might be inside my speaker switch?
I have a speaker switch which has been in continuous use since some time in the 1980s. It a QED SSU4. To my surprise, there are plenty of pictures on the net and even some for sale. Even more ...
2
votes
2
answers
2k
views
Audio Jack Sound Signal?
I was experimenting with my laptop's audio jack port (the headphones one) and something that blew my mind happened. I took an AUX to AUX cable and connected it my laptop (so I could easily have access ...
2
votes
4
answers
46k
views
Increasing resistance on speakers
My amplifier is rated at 8ohms for my surround sound but my speakers are 6 ohms. The owners manual says that if the speaker resistance is too low the power protector will blow and that is exactly what ...
2
votes
3
answers
550
views
How can we drive an 8 ohm speaker if it can only support around 1.5-2 watts for an Audio Amplifier Circuit?
Goal of the circuit:
Must be able to deliver 1.5 W to the speaker (8 Ω) at 1 kHz.
First Problem
1.) how can we drive an 8 ohm speaker if it can only support around 1.5-2 watts? Because when we input ...
2
votes
4
answers
2k
views
LED's flash with music
I am wanting to put have a few LED's flash with the intensity of my music. I don't need a color organ, but just want the LED's to flash in sync with the music. I am amplifying the signal with a LM368 ...
1
vote
2
answers
2k
views
What exactly does Watts and dB signify? [closed]
Now this is confusing.
At some point i read that higher watts does not neccesarily signify high volume sound. An amp rated at 100w and other rated at 50w dows not mean the former is 2 times louder. ...
1
vote
2
answers
3k
views
Amplify speaker with 9v battery and one transistor
I started electronics recently and I'm trying to make the most basic mp3 amplifier. I try to amplify the music from my phone to the speaker. My phone already amplifies the sound when I connect it ...
1
vote
1
answer
5k
views
Control 5 V buzzer using 5 V microcontroller (which can't drive it directly) and a single 5 V power supply?
I have a PB-12N23PW-05Q buzzer and I'm trying to use it with ATmega 162. I can't connect it directly to pin, because from what I've read from 162's datasheet, it can source at most 20 mA. The buzzer ...
1
vote
1
answer
697
views
How to tweak my stereo bluetooth amplifier into mono
First of all I'd like to thank anyone who's going to spend time reading (and answering) this.
I'm a confirmed software developer and a fellow user of stackoverflow, who knows how boring it can be to ...
1
vote
1
answer
4k
views
Maximize performance LM386 and 4Ohm speaker
I'm designing a very simple circuit which contains a microcontroller, an LM386 and a speaker.
I've previously asked a question:Help in designing a speaker driven by an LM386
and the answers helped ...
1
vote
2
answers
489
views
Powering AC Appliance with DC
I have an AC speaker set and it is plugged into an outlet. Then the outlet is put into a transformer where the transformer output is 17V 2.5A AC. Then from the transformer is put through a bridge ...
1
vote
3
answers
10k
views
50W Amp for 15W Speaker
I am building a portable speaker and I am looking for a decent amp for my two 15W Phillips speakers. It is tough to find an amp that is efficient and cheap so I was wondering if there is something ...
1
vote
1
answer
4k
views
Lots of noise in the microphone amplifier circuit when idle
I come again to get help from the experts.
I am using this BJT transistor in the circuit.
http://www.fairchildsemi.com/ds/2N/2N3904.pdf
Here is the microphone that I am hooking up in the circuit.
...
1
vote
3
answers
1k
views
How to Turn the 555 Timer Output (Astable Mode) into a Decaying Square Wave?
I am currently working on a 555 timer in astable mode whose output will be fed into a 0.5W, 8Ohm speaker. I want a fading effect for the sound that will be produced by the speaker. I already acquired ...
1
vote
1
answer
3k
views
Combine stereo audio amplifier outputs
I got this receiver. Its output power is 2 x 30W on 8 ohms. My question is: is it possible to combine the power from these 2 channels and connect both channels to a single 60W speaker? And if it's ...
1
vote
1
answer
2k
views
Why are load resistor values in common-emitter amplifiers so large?
So I have seen a few circuits for common-emitter amplifiers, like this one here.
I get the function of most of the components and thir placements, but my question is, why is the load resistor at 1....
0
votes
1
answer
437
views
Help me hack this speaker, where would I introduce DC voltage
I have a speaker that runs off of AC (there is a switching converter within the speaker) I'm attempting to convert it to battery power, From my understanding the speaker runs off of 5V (someone else ...
0
votes
1
answer
698
views
Amplifier impedance matching with constant voltage speaker systems
I understand that in order not to potentially overload an amplifier one should connect a speaker with an impedance no less than that specified, and I have just recently come to understand that for ...
0
votes
1
answer
119
views
Speaker does not alternate and only short beep under combined astable oscillation
Both oscillation work fine separately with SPKer
taking out R6, intermittent beep can be heard. Since current thru R5 is from time to time (decided by R3/C2 time factor).
taking out R5 beep sound is ...
0
votes
1
answer
2k
views
PSpice library for a speaker?
I am trying to simulate a current driver using TIP31 transistor for a speaker with known resistor and wattage. Can anyone please help me find a PSpice library for speakers? If there is not a library, ...
0
votes
2
answers
450
views
Designing an amplifier to drive a speaker
I am a beginner in designing this circuit, can someone give me a tip on how can I achieve the following specs?
Variable gain and a maximum gain of 12 dB
Input impedance greater than 30 kΩ
Load ...
0
votes
3
answers
3k
views
Increasing Frequency of a Signal
I was wondering if it would be possible to increase the frequency of a signal by a fixed amount. Basically, I have a negative wire soldered to a speaker and a positive wire that very quickly breaks/...
0
votes
1
answer
666
views
speaker problem with high volume
I am trying to build an audio system . I have a speaker which is rated 10 W and 8 Ohms . I am using a circuit from datasheet of TDA2040 with a pre-amplifier circuit with the microphone . when I ...