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.

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4
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2answers
150 views

Driving a speaker directly through an audio DAC?

I have a project where I'll need to generate some sound waves. In case it matters, the microcontroller I'll be using is an STM32L476RG which have an internal DAC. The question I have is related with ...
-2
votes
1answer
50 views

if I link four bass speakers PDA 1650 does the ohms change [closed]

I've got a hpa 3100l amplifier which I want to bridge which is 3400 watts in 8 ohms can I link 4 PD 1650 8 ohm speakers to them without causing damage does the speaker ohms change
-2
votes
1answer
66 views

Audio op am for low noise high volume

I am trying to make a high quality circuit to take mp3 (stereo) signal and drive a 4 ohm speaker. I have been using the LM368 as in the picture below and this has ok quality when the volume is low but ...
0
votes
0answers
20 views

Post amplification filtering

I'm trying to construct a guitar cabinet, and currently have an odd setup. Here's a visual: http://postimg.org/image/g6nl0zuq9/ The circuit is: Amplifier(+)->S1 S1->S2->S4->Amplifier(-) ...
3
votes
4answers
430 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 ...
0
votes
2answers
103 views

How loud is a 0.25W speaker supposed to be?

I know this is a very broad question; I just want to know what I should be expecting from it. At the moment it's hooked up to an LM386-N3 op-amp outputting a 5V single rail square wave and it is ...
0
votes
1answer
34 views

single oscillator driving multiple speakers

This is an odd request for a circuit. I want to drive multiple speakers mono not differential from the same microcontroller. I want to just drive a tone through 8 8-ohm speakers so I thought I could ...
0
votes
1answer
52 views

how to sync leds with the beat?

how do i make led strip flash with the beat (subwoofer) without risking burning them out and im using a car amplifier that kicks out 1250w peak for the subwoofer i tried using a multimeter i got ...
-1
votes
1answer
39 views

What is a safe voltage for ultrasonic frequencies being fed to a regular speaker?

In a circuit I am designing there will be high frequency noise output into a speaker at -60 to -80 dBV. It's just that I opted to use a simple 2nd order LC filter (47 uH, 470nF) for delta-sigma ...
1
vote
2answers
31 views

Multi channel variable speaker design problem

As part of my my consideration of possible solutions to my multi channel variable speaker number problem arising from my attempts to restore radio functionality to an old hotel intercom system (see ...
0
votes
1answer
56 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 ...
3
votes
3answers
63 views

connect 2 speakers to act as a telephone

I've got this very faint memory from my childhood that my dad connected 2 pieces of old, 5 cm diameter speakers to each other with a 10 meter wire. And without any other equipment, it would transmit ...
0
votes
2answers
134 views

Trying to remove distortion of speakers seems impossible

I'm working in a project with the goal of make a portable bluetooth speakers without distortion. When I try to turn up the volume, the speakers start to make a distorsion, like when rhe radio can't ...
0
votes
1answer
52 views

Easiest way to generate 25V speaker signal

I have a fire alarm that accepts a 25v line level speaker input at 4w, what is going to be the easiest way to play arbitrary signals over it i.e. from a 3.5mm jack, an amplifier and a transformer? are ...
1
vote
1answer
129 views

How can I hook up a simple MOSFET to amplify the PWM signal from Arduino?

I have an 8-ohm 1/2 Watt speaker I'd like to hook up to the Arduino. I'm currently hooking up the gate of a FQP30N06L MOSFET to the PWM output of the Arduino. I've tied the drain to Vcc (5V) and the ...
1
vote
1answer
37 views

Cancel resonation impedance of a speaker

In a speaker there is a resonace impedance. Now I am trying to cancel this out in order to create a flat impedance graph for all frequencies. I know this can be done by using a parralel zodel ...
0
votes
1answer
50 views

Output to Speakers or headphones?

I am going to be wiring up a custom circuit. Audio is output from two LR audio cables. I am going to wire them up to two mini speakers, one for each LR cord. But how do I add in a part to detect if ...
2
votes
1answer
93 views

Combining speaker outputs to one secondary amplifier

I have a tricky question, I hope you are able to help. I have had a search through this site and others and found part solutions to my questions. The issue: I have a Denon 5.1 av receiver and have ...
2
votes
3answers
55 views

Momentary in-line volume control

I'm a volunteer firefighter. We have two kinds of radio traffic. Tones and voice. Tones trigger our pagers, but are also audible when listening to the radio. The trouble is that the tones are much ...
0
votes
1answer
123 views

Sound generating with an AVR

I'm just wondering how can I drive a speaker with an AVR chip, like Atmega16? I have a source code for it and I have ran it in Proteus and it worked but I don't know how can I connect it practically. ...
1
vote
1answer
55 views

How do I set up speakers in series and/or parallel for a minimum 4 ohm load on the amplifier?

I need to connect 4 speakers to 1 output of a power amplifier. All speakers are identical (100 watts @ 8ohms) and the minimum load permissible on the amp is 4 ohms. They can be connected in series ...
0
votes
1answer
40 views

Maximize power to RL with LM741 output

I have to design a circuit that maximizes power to RL which is a resistance representing a speaker attached to the end of a LM741 op-amp. This is a non-inverting op amp in the circuit, and I just need ...
3
votes
2answers
213 views

Repercussions of choosing a poor audio amplifier

I have a customer who had an audio system setup in his business a couple months ago, and he's had some issues with it. The relevant bits are that one of the original amplifiers blew upon initial ...
2
votes
1answer
81 views

NE555 speaker voltage spikes

I made a NE555 circuit with speaker. It works fine, but when I connect its output to the oscilloscope, I get this view: How could I reduce these voltage spikes? How can I get nice square waves? Or ...
4
votes
1answer
238 views

Before I build: will this circuit work, or have I overlooked something?

I'm an engineering student (ChemE), just starting to get in to electronics and electrical engineering. Next semester I'm planning on adding an electrical engineering minor, but I wanted to get some ...
1
vote
4answers
198 views

Tape recorder head has only 2 pins, which one is for grounding?

I am trying to make my own cassette adapter that will help me play my music on my iPod through my car stereo system that supports only cassettes. For that I've bought a 3.5mm earphone jack and a ...
1
vote
3answers
197 views

Speaker Frequency Range and Frequency Response

What is the difference between frequency response and frequency range of a speaker? How do we measure frequency range and frequency response?
1
vote
1answer
80 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 ...
3
votes
2answers
118 views

What does a LC circuit in parallel to a speaker do?

I'm designing crossovers for my rear channels; a 2500 Hz 3rd order butterworth between an 8 ohm ribbon tweeter and two 4 ohm woofers in series (8 ohm load). While my original plan was to use two DPDT ...
2
votes
3answers
116 views

How do I check polarity on loudspeaker?

How do I check the polarity on a loudspeaker? I have an 8 ohm 2 inch speaker with no wires soldered into it and the terminals have no markings. How do I know which of the two terminals is positive ...
4
votes
5answers
504 views

High impedance loudspeakers

Available speakers all seem to be low impedance like 4 or 8 ohms etc. Philips used to make speakers of 800 ohms for their SRPP valve stereo amplifiers. The speakers weren't that great even in 1958. ...
1
vote
0answers
44 views

Speaker designed for ultrasound operation

I've created a transmission protocol in order to transmit information bits between a PC speaker and a smartphone, or between 2 smartphones using ultrasounds. I've implemented a QFSK system which uses ...
0
votes
1answer
125 views

Replacing a 8 ohm Speaker with a Piezo. Will it work?

Like Replacing a piezoelectric speaker with an electromagnetic one, but the other way round. simulate this circuit – Schematic created using CircuitLab A DC squarewave will turn on and ...
0
votes
1answer
61 views

Old cellphones versus new cellphones noise [closed]

Why older cellphones cause impulse sounds in our loudspeakers, but new cellphones not? Why these impulse sounds can be heard in our soundspeakers?
0
votes
2answers
73 views

Where to add a capacitor

So I have a small circuit that I made to flash some led's in sync with my music. It's just a signal from my speaker going into the base of my 2N3903 transistor and the ground of the led is being ...
0
votes
1answer
59 views

Speaker and Headphones on Microcomputer

I am designing a circuit for the CHIP Microcomputer and I want to enable audio output using headphones OR a speaker. For clarification, when the user plugs in headphones, I want the speakers to be ...
0
votes
1answer
66 views

Headphones with dual jack, reduced volume

I recently built a pair of headphones and added an audio jack input to both the cans, for convenience of connecting. That would also serve another purpose of letting my girlfriend hear the same music ...
0
votes
1answer
169 views

How can a speaker have a higher output power than input

Looking around the internet, there haven't been many answers to this questtion. Here is one which doesn't fully explain it: Power input smaller than output? How can this be? So I am confused. I know ...
1
vote
2answers
128 views

Which capacitor for DC blocking in audio applications?

Which capacitor (electrolytic, film, ceramic) do you use for DC blocking in audio applications? From what I have seen most people use electrolytic capacitors. But, also from power decoupling theory ...
-1
votes
1answer
404 views

Can I connect multiple speaker boxes to a single amplifier output? [closed]

I've seen arrays of passive speaker boxes (high output passive professional PA speakers) that were connected to each other and only the last (or first) one was connected to the power amplifier (a very ...
-1
votes
1answer
64 views

2x50w stereo vs 100w mono amplifier efficiency

Which is better for efficiency. mono 100w amplifier or stereo 2x50w It is important because I'am building a portable speaker and it is really important for me to use little power. Also which ...
0
votes
2answers
62 views

Driving a loudspeaker

I've been thinking about this on and off for a while and I thought I would ask the experts. The cone and coil of a loudspeaker have mass, so it takes time and energy to move the cone to another ...
0
votes
2answers
201 views

Ceiling speaker has 3 wires

I recently bought this ceiling speaker (http://www.3acctv.com/upload/uploads/Specification/T-103C.pdf), as shown in the PDF it has 3 wires attached to it. I am no expert in this, so I was wondering if ...
0
votes
4answers
149 views

How could I read a digital input (an open/closed switch) from a smartphone without a digitizing board?

I have to read a single digital input signal (a trivial open/closed-circuit push button) and use this signal in an Android application on a smartphone. Of course, I could connect a tiny Arduino-like ...
2
votes
3answers
122 views

Are ten 2W speakers as loud as two 10W speakers?

If all things are the same (e.g. total magnet weight, manufacturer, cone material) and I have two 10W speakers as compared to ten 2W speakers would the decibel level be the same?
0
votes
0answers
47 views

Standalone Ultrasonic speaker with preprogrammed frequency

I've been toying around with some Piezo speakers for my Arduino. Now I've been wondering if there is a way to remove the Arduino from the equation. It only serves as a power supply for the speaker. ...
0
votes
1answer
155 views

Reverse audio jack for front and back speakers

My problem is a strange one. I have a computer connected to front and back speakers via 3.5mm audio jacks. Sometimes I use the computer with the monitor at my desk. Other times I'm using it to watch ...
-1
votes
1answer
40 views

Materials for a speaker [closed]

if I have a flat, copper sheet and a magnet, Can I make a speaker? Or do I need magnet wire coiled up?
0
votes
0answers
43 views

Piezo and speaker

I have a question. I have not tested this circuit yet, but I am sure it works, my friend did. He used a 8ohm speaker as it is shown in circuit diagram. I want to make it a bit compact so I want to ...
-1
votes
1answer
108 views

How to connect speaker cables via S-Video plug [closed]

I would like to buy a speaker system consisting of an active subwoofer and two satellites. From the photos I can see, that the satellites are connected to the central sub using supplied cables with ...