Ac Coupled

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blog.prosig.com/2013/01/15/what-are-ac-and-dc-coupling
Перевести · What is AC coupling? AC coupling allows only AC signals to pass through a connection. A DC source can be considered to be like a battery, in that there is a constant …
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https://www.noiseengineering.us/blog/2017/5/12/ac-vs-dc-coupling-what-where-why
Перевести · 16.06.2020 · AC-coupled circuits remove any signal below some frequency threshold. Look back at the figure: what is the frequency of the DC signal? It’s pretty low, or even zero -- as in, it’s not moving. That means that the AC-coupled circuit will filter it out completely. Does this sound like any familiar utility? Yep, the AC-coupling circuit is a really basic highpass filter.
https://en.m.wikipedia.org/wiki/Capacitive_coupling
In analog circuits, a coupling capacitor is used to connect two circuits such that only the AC signal from the first circuit can pass through to the next while DC is blocked. This technique helps to isolate the DC bias settings of the two coupled circuits. Capacitive coupling is also known as AC coupling and the capacitor used for the purpose is also known as a DC-blocking capacitor.

A …
In analog circuits, a coupling capacitor is used to connect two circuits such that only the AC signal from the first circuit can pass through to the next while DC is blocked. This technique helps to isolate the DC bias settings of the two coupled circuits. Capacitive coupling is also known as AC coupling and the capacitor used for the purpose is also known as a DC-blocking capacitor.

A coupling capacitor's ability to prevent a DC load from interfering with an AC source is particularly useful in Class A amplifier circuits by preventing a 0 volt input being passed to a transistor with additional resistor biasing; creating continuous amplification.

Capacitive coupling decreases the low frequency gain of a system containing capacitively coupled units. Each coupling capacitor along with the input electrical impedance of the next stage forms a high-pass filter and the sequence of filters results in a cumulative filter with a −3dB frequency that may be higher than those of each individual filter. So for adequate low frequency response, the capacitors used must have high capacitance ratings. They should be high enough that the reactance of each is at most a tenth of the input impedance of each stage, at the lowest frequency of interest. See Impedance bridging.

Coupling capacitors can also introduce nonlinear distortion at low frequencies. This is not an issue at high frequencies because the voltage across the capacitor stays very close to zero. However, if a signal is allowed to pass through the coupling that is low relative to the RC cutoff frequency, voltages can develop across the capacitor, which for some capacitor types results in changes of capacitance, leading to distortion. This is avoided by choosing capacitor types that have low voltage coefficient, and by using large values that put the cutoff frequency far lower than the frequencies of the signal.

These disadvantages of capacitively coupling DC-biased transistor amplifier circuits are largely minimized in directly coupled designs.
https://www.cleanenergyreviews.info/blog/ac-coupling-vs-dc-coupling-solar-battery-storage
Перевести · 20.01.2020 · AC coupled is the preferred battery configuration for larger solar installations while DC coupling works very well for smaller systems. We explain the …
AC coupling allows only AC signals to pass through a connection. A DC source can be considered to be like a battery, in that there is a constant negative charge from the battery’s negative terminal to the positive terminal. An example of such a source is shown in Figure 1.
blog.prosig.com/2013/01/15/what-are-ac-…
The video signal is AC-coupled into a DC restoration circuit: hence, the input video signal can have any DC bias. This input circuit is compatible with both AC- and DC-coupled video sources. Figure 6b shows the input stage that uses a polarized capacitor.
www.maximintegrated.com/en/design/tech…
What ' s The difference between AC coupled and DC coupled output?
What ' s The difference between AC coupled and DC coupled output?
An AC-coupled output includes a series capacitor ( Figure 1a ), while a DC-coupled output does not ( Figure 1b ). A designer new to video output circuits may find such a choice confusing because adding a capacitor to the output path increases cost, requires space, and distorts the video signal.
www.maximintegrated.com/en/design/tech…
You shouldn’t default to AC coupling just because you are measuring an AC signal. Turning on AC coupling mode in the wrong situation can hide DC components that you need to know about. Even worse, it can attenuate low frequency components into a warped, incorrect version of your signal.
blogs.keysight.com/blogs/tech/bench.entr…
https://www.maximintegrated.com/en/design/technical-documents/app-notes/3/3768.html
Перевести · An AC-coupled output includes a series capacitor (Figure 1a), while a DC-coupled output does not (Figure 1b). A designer new to video output circuits may find such a …
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019O6oSAE
Перевести · 11.12.2019 · AC Coupling: AC coupling consists of using a capacitor to filter out the DC signal component from a signal with both AC and DC components. The …
https://m.youtube.com/watch?v=L7cZj0u-Z2Q
Перевести · 12.05.2019 · AC Coupled PowerWall PROTOTYPE - YouTube. OD3804 V10 Shortloops …
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Noise Engineering is a Eurorack and 5U modular synthesizer manufacturer based in Los Angeles, California. 
In Eurorack, there are lots of types of modules, with different types of inputs and outputs designed to do different things. The way that the ins and outs of modules are designed can change what they do, of course, but sometimes the differences can be subtle: for instance, why are there separate audio and CV mixers? 
In the context of modular and not, say, trains, coupling is what happens when you patch two modules together. The electrical signal flows out one module, through the patch cable, and into another module’s input. That signal might be alternating current (AC) or direct current (DC). AC signals will come from things like audio oscillators: oscillators make signals that move up and down, generally pretty fast. DC signals will come from places like sequencers, offset generators, or LFOs: unlike audio oscillators, they’re static and they don’t move (or least not very fast). And if an input is DC coupled, you can put a slow or static signal into it; if an output is DC coupled, it’s good for that sort of signal. 
A DC-coupled input is pretty simple. Here’s a really basic, not-interesting schematic that illustrates the point. There’s an input going to an op amp and then right out through another jack. The output on this circuit is DC coupled.
Of course, we need the contrasting AC-coupled example, too: 
An AC-coupled schematic. C1 in series and R3 in parallel are the key to AC coupling.
If you know a bit about electronics you can probably see what’s happening here in this AC-coupled circuit. If you’re like me and still think a capacitor is probably some kind of hat, let’s explain. You’ll notice that there’s a single difference between these circuits: The AC-coupled version adds C1, the part that looks like this: | |
That’s the symbol for our capacitor. Its placement before the resistor that goes parallel to ground in the circuit is what makes it AC coupled. AC-coupled circuits remove any signal below some frequency threshold. Look back at the figure: what is the frequency of the DC signal? It’s pretty low, or even zero -- as in, it’s not moving. That means that the AC-coupled circuit will filter it out completely.
Does this sound like any familiar utility? Yep, the AC-coupling circuit is a really basic highpass filter. Audio signals are high enough frequency that a super low highpass filter won’t take out anything that we care about. But why would we want to modify a signal at all? Isn’t it good enough on its own? Let’s take a look at some examples of common signals we’ll find in Eurorack.
For our purposes, we’ll consider an AC signal to be any signal in the audio range (roughly 20Hz -20,000Hz, depending on your age and how many concerts you’ve attended). An example of an AC signal would be a sine oscillator at 100hz.
Notice this sine wave has an offset in it and isn’t centered: 
These are relatively high frequency signals. 
Contrasting that, a DC signal is anything that doesn’t move at all (or moves incredibly slowly, more on that later). An example of a DC signal would be a step sequence: 
You can see that relative to the AC signal, these signals have a frequency that’s pretty low -- less than one cycle per second (<1 Hz). If we have a DC-coupled input on a module, these very low frequency signals are no problem. For instance, if we run that step sequence into the frequency input of a VCF, it will open and close the filter. BUT if we run it into an AC-coupled input, it acts as a highpass filter and filters it out completely! No signal for you!
AC (audio) signals can also have DC in them, often unintentionally. What? Yes! 
When dealing with audio, we don’t want offsets for a number of reasons: it can limit dynamic range, it can damage audio equipment, and it can cause other issues when dealing with audio processing. Let’s look at what AC coupling would do to that initial offset sine wave: 
See how it’s centered now? The offset has been removed and it’ll perform much more like we want it to. 
Generally, unless you are intentionally using audio-rate modulation for things like FM synthesis, assume your modulation sources are DC signals. Pitch sequences, CV sequences, envelopes and even LFOs will all get filed under DC. AC signals will be anything in our audio path. 
So here’s where it gets weird. An LFO certainly looks like an AC signal, but it’s in the name: they are low frequency. Remember that an AC-coupled circuit is just acting as a highpass filter, so generally, they will filter out LFO signals. If a circuit is AC-coupled to filter out everything below 10hz, a 1hz LFO (which is actually relatively fast for a modulation signal) still won’t make it through. Even though LFOs move back and forth, think of them as DC.
Here’s where things get even weirder. Sometimes DC offsets in audio can change how audio processors respond. On occasion we want this, at least in part of our signal chain, as it can create interesting results. A common example is in wavefolders: there will often be an offset control (usually called something else like “symmetry”) that injects a DC offset into the audio signal before it hits the wavefolder to create new sounds. However, if this is the case, the wavefolder will most likely have an AC-coupled output so that the next module in the chain doesn’t have any issues. Basically, both AC and DC signals can have their place in audio, but we should know how and when to use them.
In the broadest of terms any reasonably high frequency signals are considered AC, and static (or extremely low frequency) signals are considered DC. Simple as that. 
This matters most to modular users when considering what modules to use for a patch. The most common (and important) place where this issue comes up is in mixers: if you’re mixing DC signals, you need a DC-coupled mixer, which will generally be marketed as CV mixers. If you’re mixing audio signals, you could use a DC mixer, but you’ll generally have reduced audio quality due to offsets creating reduced headroom and sometimes distortion in the audio path. Because of this, you’ll want to find an AC-coupled mixer, which will be marketed as an audio mixer. 
First, check the manual. Many manuals specify if an input is AC-coupled, so there may be clues there. If not, ask! We have yet to meet a manufacturer who doesn’t want to help users enjoy their modules to the fullest.
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