Audio signal voltage

Audio signal voltage

What does "line level" mean? A device that operates at line level either has a very strong output signal, or only functions properly when you feed a very strong signal into it. Examples of line level outputs include mic preamps, mixers, the "line out" of an amp, and some effects-loop "send" jacks. Inputs needing this level include power amps, most rackmount signal processors, and some effects-loop "returns". This is in contrast to " instrument level " which is what typically comes direct from a guitar or bass, and " mic level " which is the typical output of a microphone or DI box.

Both are much lower than line level. Generally speaking if you send an instrument-level signal into a device that needs line-level input, you will get weak sound, inadequate processing, and probably extra noise as you boost the signal to compensate. If you send a line-level signal into a device that's meant for instrument or mic-level input, you will get distortion. The effects loop on many amps is designed to both send and receive line-level signals, so putting a typical pedal in the loop will often get noise, weakness, and distortion.

You may find some exceptions though: either an amp loop that can operate at instrument level, or a pedal that can operate at line level. The "loudness" or "strength" of an audio signal inside your rig is measured in AC voltage. However the numbers you'll read in an amp's manual or on a website are usually given in dB or dBu, not voltage. The term dB decibel by itself means the amount a signal level changes in relation to wherever it started.

That voltage is usually either 1. The terms dB vdB uand dB m have different values, but they all have that third letter that signifies a specific reference point ; you can use them to calculate voltage levels. Remember that decibel numbers by themselves are just ratios in reference to a specific starting point, not a fixed value; in other words, 35 dB gain from one device can result in the same actual level as 50 db gain, or 10 dB, or even dB from another device--it all depends on what values each separate engineer started with.

So look for that third letter after the dB to know that you're dealing with a fixed reference point, and therefore a firm value for the highest average voltage output.

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Thread starter Rafflez Start date May 16, 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 audio file from an iPod or computer, maybe even a microphone and turn that into variable voltage or current to make an electromagnet vary in strength.

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Can anyone help me figure this out? Related Electrical Engineering News on Phys. Gold Member. If you want to make a really cool one, you should have multiple channels with a electomagnet for each. For this example, you would need to make a circuit with 3 band-pass filters with their outputs driving transistors capable of delivering enough current to produce a good magnetic field. Here's a 5 channel schematic showing operational amplifiers being used to make the band-pass filters and also includes the power supply and audio input circuitry.

Last edited by a moderator: May 5, That's exactly what I had in mind I just had no idea how to build it.I offer the educational material I have created on this website free of charge to the global community for its elucidation and use as it sees fit, with the understanding that it must be attributed to the author, as it is copyrighted material.

Having said that however, should you find that it is of value to you, and wish to make a contribution to the ongoing viability of this site, I have set up PayPal account for your convenience and hereby express my gratitude for whatever you may be able to forward. Signal level. The large variations of signal level have to be fully understood to be in command of the mixing process.

The first step is to have a clear understanding of dB deci Bell. A microphone converts the sound to a Voltage.

The mixer increases and modifies the signal Voltage. Increasing the signal Voltage is described as Gain. A mixer functions with signal Voltage but with very little current Amperes. The power amplifier increases the signal Voltage to a much higher level and adds a large amount of current Amperes to drive the speaker. When working with mixers and effects we describe the audio signal as its Voltage or gain.

Changing the signal Voltage gain changes the loudness power we hear. Increasing the signal Voltage gain X 2 causes the power to be increased X 4. This simply shows that increasing the V X 10 also increases the A X Therefore the Watts power is increased by We hear the power increase as a sound change of 20dB.

This reference applied to valve technology pre and no longer applies. This dBm and dBu as 0. A 3V supply rail is small therefore the signal level has to be small. Understanding signal level and dB is essential to obtain the maximum dynamic range from the mixing process. Without understanding signal level and dB it is not possible to obtain the maximum dynamic range from the mixing process.

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Therefore one is forced to use excessive compression to squash the dynamic range to stop everything from being distorted. The Rails. The total supply voltage between the rails is 30V. High power professional amplifiers have a rail supply of 80V to V. It can be seen in the above pic that the maximum AC music signal is limited by the rails.

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If the signal is increased the peaks of the sine wave will be clipped by the rails. Extreme clipping is used by guitar players as sustain. Sustain simply means sound remaining at the same level, by being clipped. Valve amplifiers give rounded soft clipping whereas solid state amplifiers clip with precise sharp edges.

There should be zero difference between a solid state and valve pre-amplifier when not being clipped.In physics, attenuation is regarded as a positive value. This naturally leads to sign errors when entering numbers. If we consider audio engineering, we are usually not interested in power.

Do not ask what power amplification means.

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Leave that to the telephone companies or the transmitting aerials antennas. Power gain is really not used in audio engineering. Do we really need power energy amplification? Read the text at the bottom. If you search for the amplification ratio, given the dB value, then go to the program dB calculation.

Amplification Gain and Damping Loss. In audio technique the following "power or energy amplification " is rather unusual. The voltage is always given as RMS value - but that is not valid for electric power. Gain controls on an amplifier are basically just small potentiometers variable resistors or volume controls, that allow you to adjust the incoming signal to the amplifier.

The amplification factor, also called gain, is the extent to which a device boosts the strength of a signal. The damping factor, also called loss, is the extent to which a device reduces the strength of a signal.

Enter two values and press the right calculate bar in the line of the missing answer The used Browser supports no Javascript. The program is indicated, but the actual function is missing.

Gain is the ratio between the magnitude of output and input signals. The used Browser supports no Javascript. Input: voltage power. To use the calculator, simply enter a value. Voltage level L U Audio dBu. Gain G. Voltage ratio factor A V. Power ratio factor A P.This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. By continuing to use this site, you are consenting to our use of cookies. Forums New posts Search forums.

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audio signal voltage

Search Advanced search…. New posts. Search forums. Log in. Measuring audio signal voltage with DMM.

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It only takes a minute to sign up. What voltage range can I expect to see on the audio lines from the iPhone? I assume that turning the volume up on the phone will produce a large AC voltage, but how large does it go up to? I want to make sure that it wont exceed the voltage level that an Arduino can read on its input pins. Will I need to provide any circuitry between the iPhone and the Arduino?

Commercial line out specification is to be able to drive 1 milliwatt to a ohm load.

What Are The Best Resistors For Audio Equipment? – Noisylabs

For a sine wave, this means a voltage of 0. There is no absolute maximum, and it depends on the circuit design. This is however for the "Line out" plug which, apparently, carries a signal at a fixed amplitude and lets the receiving end determine the volume.

In most cases changing the volume setting on the source equipment does not vary the strength of the line out signal. For a speaker-driving headphone plug I believe things might get more complicated, since that signal is really rather a current signal used to drive the coil of a speaker.

In contrast to line level, there are The strength of the various signals does not necessarily correlate with the output voltage of a device; it also depends on the source's output impedance which determines the amount of current available to drive different loads. I guess your best bet might be to look at the wave with an oscilloscope, which should have a high-impedance input like the Arduino's analog input ADC.

Edit: The Wikipedia article I used as a source has been edited a lot since I originally posted this answer. Therefore I'm striking most of this answer out and recommend referring to the Wikipedia article linked at the top. Unfortunately there is a lot of "audiophile" nonsense around headphone amplifiers and headphone impedance.

audio signal voltage

Probably the top 5 results for "headphone impedance" on Google are just wrong. This site contains some useful information though a lot of it is wrong too. But anyway if you look at the graphs which I assume are correct, you can see that in the audio frequency range most headphones have a fairly small reactance compared to their resistance. And most headphones have an impedance around Ohms with some crazy "audiophile" headphones having higher impedance e. He suggests that 5 mW is sufficiently loud for portable headphones.

In a common emitter transistor amplifier the audio signal voltage across the collector is `3 V`. The

Audiophile headphones will require higher power. Anyway, for the Sony MDR-EX51 headphones shown on the page linked above you can see that they are fairly close to a simple 17 Ohm resistor.

At 5 mW that would mean a voltage of 0. A simple solution may be to insert a 4. There is no hard-and-fast rule for headphone jacks; be it a laptop, MP3 player or a regular stereo system.A transformer is a static electrical device that transfers energy between two or more circuits through electromagnetic induction.

The transformer can Step up or Step down signal voltage. The transformer has no direct connection between the primary and secondary windings, the electrical energy transferred using electromagnetic induction. Due to this isolated property between primary and secondary, the transformer provides electrical isolations between primary and secondary, which means from the input and output or vice versa.

We have covered detailed article on Transformers. A Transformer receives a sinusoidal input signal and converts it to an output signal.

During this conversion process, there are no physical connections between this two. This conversion actually happens by the two or more insulated copper wire coils which are denoted as windings wrapped around a magnetic iron core. In such case, the primary and secondary winding turns ratio fixed to Due to this, the transformer does not alter the voltage or current level. It does only create isolation between the Input amplifiers with the output speaker system. Other than the isolation transformer there is another audio transformer too, which will change the output voltage level depending on the input AC signal.

The loudspeaker is a huge load and needs to provide the required current and voltage across it to produce proper sound vibration. An Audio transformer with Step-up feature will step up the voltage or the current level to drive a load across it. Same happens for the Stepdown transformer too.

audio signal voltage

It converts the voltage from higher to lower with the increased current output. The audio transformer also provides impedance matching specifications.

When the output of one circuit or device is directly connected to the input of another device, it is very important that the device output impedance and device input impedance both are matched. An impedance matching transformer provides this feature and converts higher impedance output to lower impedance to drive a low impedance speaker or feeding to another low impedance device.

Although an Audio transformer does not have a physical connection between his primary and secondary coil, the transformer provide bidirectional feature between this two windings. We can also use the same primary side as secondary and secondary as primary.

In such case, the transformer provides signal loss in one direction and signal gain in reverse direction or vice versa. The audio transformer works at frequencies between 20 Hz to 20 kHz. So, the operation of an Audio transformer has much wider frequency range. As discussed above, the audio transformer uses Impedance balancing technique. It is very useful for balancing amplifiers and loads Loudspeaker and other that use a different input or output impedances for maximum power transfer application.

In modern days, speakers impedances ranges from 4 to 16 ohms, typically 4 ohms, 8 ohms or 16 ohms speakers are available whereas Transistor or Solid state amplifiers use — ohms output impedance.

If the amplifier is a retro design, such as old Valve or Tube amplifier then the output voltage sometimes reach V with 3k impedance.

We need impedance matching transformer which will convert the High impedance to low impedance and should convert the voltage and current to a level which will directly drive a loudspeaker. A Transformer can have multiple windings in the primary and secondary side. The ratio between primary and secondary windings, the number of coils turns in the primary side Np and a number of coil turns in secondary Ns is called the turns ratio.

This turns ratio also defines the primary and secondary voltage ratio as the voltage is directly proportional to the primary and secondary winding turns.


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