Ohms law calculator speakers
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Ohm's Law Calculator
I have a 5v supply, and I understand that if I choose to put a low pass filter on my Vref line then the dac could be outputting only 3v, but for the sake of this discussion just assume I have no filter on Vref and the dac is outputting 5v, and the amplifier gain is Now look at the charts on page 5 of the amp's datasheet.
The numbers I see there don't match up. In fact, there's two sets of numbers for different total harmonic distortions.
How can this be? If I have a 5v supply and a 4 ohm impedance, how can the output, according to these graphs, be either 2. And why is it these values are so low compared with what ohms law seems to say the power should be for 5v flowing through 4 ohms of impedance?
To keep it simple you are comparing a DC power calculation to a AC audio is a ac signal power calculation. So what you're saying is if I input So I take the amplitude which is 2.
I can't figure out how you got from there to 3. And if you made a mistake and the. So it looks like you did 1. I guess I will have to read the datasheet more careful to see what kind of magic they came up with.
Ok it's solved, that chip is using a full differential output stage, in effect it is two amplifiers degrees out of phase driving the speaker load between their two outputs, so they can get double the power output that a single stage linear amp stage could wiring the speaker from output to ground.
So the theoretical maximum audio output power would use the 5vdc as the peak value not 2. Figure 33 of the datasheet shows this differential output stage with waveforms that should make it more clear how this magic is performed. The only thing I'm wondering about now is that graph on page 5 which shows two different power levels based on the total harmonic distortion.
What's up with that? Does that have to do with how much noise is getting into the amp or what? No, total harmonic distortion is a property of the waveform you are trying to amplify. A pure sin wave has no distortion in it. This is of course impossible but it gives the lowest power output because the RMS calculation gives a direct power equivalent output to a DC power of the same value. Try and think of it as a base level where the RMS voltage to peak voltage relationship you learned about earlier holds.
For power calculation purposes it is assumed you have a pure undistorted sin wave at one frequency. As the wave gets more complex, it has more harmonics and pushes up the average power. Furthermore, are you saying that at 5v with a 4ohm speaker, if I output a square wave then I will in fact be outputting 6.
An amplifier's total output harmonic distortion is just a measurement of how much an amplifiers output deviates from the original input signal's waveform. That is how much distortion does the amplifier add to the input signal. No linear amplifier is perfect, reality has yet to come up with the long sought after 'wire with gain'. If you drive an amp too close to it's power rails or cause more then it's current capacity can supply the output waveform say by trying to drive a speaker with too low an impedance value will deviate from the input waveform, thus increasing it's output distortion value.
It's all a trade-off that the designer has to deal with. Hi-Fi amplifiers were typically those that would add no more then. Passing a square wave through a audio linear amp is one method to test it's upper linear frequency response as a square wave is a fundamental sine wave plus all it's odd harmonics and as the amplifier does have a specific upper and lower frequency limit the output waveform will deviate from a true square wave at some input frequency.
Max power output, max total harmonic distortion, and flat frequency response are interrelated 'goodness' rating for any specific amplifier. In theory only. But even though closer to '6. A square wave only contains odd harmonics with a value of the reciprocal of the harmonic number. So lots of harmonics missing and the power of the higher ones are quite low. The worst case waveform would be white noise over the full bandwidth of the amplifier, but that is not very helpful as you don't want to listen to that.
Okay, but how does one "decide" to operate at a specific level of distrotion? There are two levels listed for the same input voltage and the output power. There must be another variable by which you adjust this. It says its rated for 2W, max 2. And I am even more concerned now that it sounds like you guys are saying the power rating is for a best case of a sine wave, and that even more power will be output if something like a square wave or, worst of all, white noise, is played.
My concerns are probably unfounded, but if the amp will actually be putting out 2. That could be both good and bad. Also, I know there will be some voltage drop on that dac and the amp with my filtering. I dunno how much yet though. But I'm guessing it will probably drop the output from 2.
Still, wondering what the worst case here is. I think you are making too much of it and over thinking the whole 'problem'. You know most amplifier designs deal with this by installing a volume control for the input signal such that the user can adjust the maximum power output of the amp.
You haven't mentioned what kind of signals you are trying to amplify, music, sine-waves, square-waves, noise, etc? I suspect that the speaker you have selected will work fine with that amp. Yeah, I know I can allow the user to adjust the volume, but I also know the kind of folks who'll be using this, and they'll do things like max out the volume and connect 4 ohm speakers in series thinking two speakers will be louder than one.
Or worse yet connect them in parallel across their 7w amp rated for 4 ohm speakers and either blow the amp or overheat it or cause distortion, I'm not really sure which.
I just don't want them to either blow their speaker or think it sounds crappy and blame it on me. So what again do you require from us? There is no guaranteed protection from malicious or ignorant users and protecting your reputation is probably not something we are qualified at.
I just want to understand what's going on in the circuit. A friend of mine has one of those 7W amps that he has two 4 ohm speakers connected in series. When he cranks the volume up, the sound becomes all distorted. I don't want that to happen with my circuit and I want to understand what's going wrong with his so I can help him correct it. I've told him to try hooking up just one speaker if he wants more volume, but not to connect two in parallel out of concern for damaging his amp with a 2 ohm load.
But beyond this advice, even with all I've learned about amps while designing this circuit I'm still at a loss to explain the issue he's having with distortion. He's certainly not exceeding the wattage rating of the speakers he's using; they're pretty nice ones. Witha a 12v supply. If I understood why he and almost everyone else using this setup was having problems I'd feel a lot more confident that people won't have problems with my setup.
My best guess right now is that the sound chip has a PWM output and that's messing with the amp. Some have tried adding a low pass filter between the sound chip and amp though and one some have met with success using this. Well good luck with your project I mean it. I've passed on about all the wisdom I can spare for now. You don't it is a function of what signal you put into it. Just because a speaker is running at less than its rated power does not mean it will not distort. The same goes for amplifiers.
To find out the cause of the distortion look at the signal with an oscilloscope, if the signal is not distorted but the sound is then it is your speaker. Remember those circuits in the data sheets are just starting points for a practical design not a finished design.
Supply decoupling is important as well as filtering and correct capacitor type selection. I don't think that is correct. It is stating two operating conditions that would allow the amplifier itself to ADD up to that amount of distortion to the signal.
Amplifier stages do add distortion, how much is a function of the device linearity and how they are operating on their load lines. An amplifiers distortion specification has nothing to do with how much or little distortion is on the input signal. An amps distortion spec is based on only the distortion added by the amplifier.
But the point is that the more distortion is on a signal, however it got there, changes the power output of the system. Yes I don't disagree with that. No I don't see that either. Power output and distortion output are two separate measurements dealing with different attributes of a audio output signal.
Distortion is simply the deviation of output signal relative to input signal minus gain. Power output is simply the product of voltage and current of the output signal. Specifying power at a maximum allowed distortion value is just a truth in advertisement method so one can make sure they are comparing apples to apples for two different manufactures power claims. Using Arduino Audio. Let's also assume I'm using a 4 ohm speaker. You lost me. I did rather mess that calc up didn't I. Later: Ok it's solved, that chip is using a full differential output stage, in effect it is two amplifiers degrees out of phase driving the speaker load between their two outputs, so they can get double the power output that a single stage linear amp stage could wiring the speaker from output to ground.
Okay, that all seems like it makes sense. Thanks for that. So are you saying that if I output a square wave, that would be the worst case?
Ohm's Law Calculators and Formulas
We all know that speakers have a few different ratings: Impedance, power handling, size, frequency response. All these are intuitively simple except for impedance. What does it mean? The impedance tells you basically how much current will flow through a speaker at a certain voltage. So, ten volts of signal from your amplifier might produce two amps of current through the speaker.
SERIES & PARALLEL SPEAKER WIRING
The calculator below is useful in determining the total impedance of speakers in parallel. It also calculates how the power is shared between the speakers. If all the speakers have the same impedance, the calculation is relatively simple. If all the speakers in parallel have the same impedance, then the calculation is easy. Simply divide the impedance by the number of speakers in parallel. For calculations involving speakers in parallel with different impedance, the following formula is required it can be used with speakers of similar impedances too. Simply type the impedance of each speaker into the white boxes or use the drop-down values. The total impedance will be calculated for the entered speakers. This is useful as power sharing is a consideration when using speakers with different impedance. This calculates in dB decibels the power level difference between the highest and lowest power as it is shared across the speakers.
Speaker Impedance Calculator
This calculator tends to calculate nominal impedance that can be created with various combinations of wiring speakers together that differs. Please take note that this calculator should not be taken as a real-life situation calculation. The impedance, in reality, should be affected by various factors such as coil temperature and it should vary with frequency. Your Speaker Impedance is. Curious about how much current flows through your speaker at a given or certain voltage?
Speaker Impedance Calculator-Calculate Speaker Impedance For Free
High impedance speakers and amplifiers are found with two common specifications, wattage and impedance, i. Both of these characteristics are used to determine what amplifier power is required and what load the speakers present to the amplifier. Which specification do you use? Both can be used independently depending on the situation in the following manner. I have an amplifier that can deliver 60 watts so my total load of all the combined speakers cannot exceed 60 watts.
What Do Speaker Impedances Mean?
That speaker impedance rating on your towers and bookshelf speakers is held up as a mystery—something strange and mystic, yet dangerous. The bottom line is that people are confused about speaker impedance. I think the easiest way to define speaker impedance is to say that it is the resistance any speaker gives to the current and voltage being applied to it. In a nutshell, a loudspeaker is a big resister—a really cool one. Speaker impedance changes based on the frequency of the signal fed into it. Most bookshelf and tower speakers are rated either 6-ohms or 8-ohms.
Audio amplifier volts ohms calculator
I have a 5v supply, and I understand that if I choose to put a low pass filter on my Vref line then the dac could be outputting only 3v, but for the sake of this discussion just assume I have no filter on Vref and the dac is outputting 5v, and the amplifier gain is Now look at the charts on page 5 of the amp's datasheet. The numbers I see there don't match up.
What Is Speaker Impedance?
RELATED VIDEO: Ohms Law CalculatorThere are several ways to wire up Speakers, the most common methods are Series and Parallel which are discussed here. Wiring up Speakers correctly to provide the best possible sound, requires some knowledge of Loading, Phase, and Impedance, while understanding Ohms Law will help you to connect your speakers properly. This allows the Amplifier to run cooler and more efficiently. It is often assumed the Amplifier is producing less output, but it still produces the same output, because each Speaker only gets a percentage of the overall power. However, increasing the resistance to more than 4 ohms of speaker resistance by adding Speakers in Series, will split the amplified audio output from the Amplifier across all the Speakers in the circuit. Adding additional Speakers is as easy, however, adding Speakers in Parallel causes the overall resistance of the circuit to drop, as resistance drops, the current must increase according to Ohms Law.
Most guitarists would probably not consider themselves experts when it comes to the subject of natural sciences. Although you may have a vague idea of the different scientific phenomena that hide behind every note you play, your main focus as a player — quite naturally — is usually on the music itself, and the instrument. Boring science is just something that would get in the way. And yet, consider this: the everyday electric guitar player probably namechecks a bunch of famous physicists regularly, even though they might not be overly au fait with the scientific laws associated with these long-dead genii in white coats. Hertz, Ohm, Volt, Ampere — these are all familiar names that belong in the basic vocabulary of any slightly technically-minded guitarist. These things duly considered, it can be highly insightful for you to get to know the stories — and the theories — behind those names in a bit more detail.
Enter the impedance of the speakers that are connected in parallel starting at the top. Data Input: Speaker one's impedance? Impedance of each voice coil?
He didn't take it into account
I apologise, but, in my opinion, you commit an error. I suggest it to discuss. Write to me in PM.