Amplifier wikipedia un
A variable-gain or voltage-controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage often abbreviated CV. VCAs have many applications, including audio level compression , synthesizers and amplitude modulation. A crude example is a typical inverting op-amp configuration with a light-dependent resistor LDR in the feedback loop. The gain of the amplifier then depends on the light falling on the LDR, which can be provided by an LED an optocoupler. The gain of the amplifier is then controllable by the current through the LED.
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A variable-gain or voltage-controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage often abbreviated CV. VCAs have many applications, including audio level compression , synthesizers and amplitude modulation. A crude example is a typical inverting op-amp configuration with a light-dependent resistor LDR in the feedback loop.
The gain of the amplifier then depends on the light falling on the LDR, which can be provided by an LED an optocoupler. The gain of the amplifier is then controllable by the current through the LED. This is similar to the circuits used in optical audio compressors. A voltage-controlled amplifier can be realised by first creating a voltage-controlled resistor VCR , which is used to set the amplifier gain. The VCR is one of the numerous interesting circuit elements that can be produced by using a JFET junction field-effect transistor with simple biasing.
VCRs manufactured in this way can be obtained as discrete devices, e. Another type of circuit uses operational transconductance amplifiers. In audio applications logarithmic gain control is used to emulate how the ear hears loudness. David E. Analog multipliers are a type of VCA designed to have accurate linear characteristics, the two inputs are identical and often work in all four voltage quadrants unlike most other VCAs.
Some mixing consoles come equipped with VCAs in each channel for console automation. The fader , which traditionally controls the audio signal directly, becomes a DC control voltage for the VCA. The maximum voltage available to a fader can be controlled by one or more master faders called VCA groups. The VCA master fader then controls the overall level of all of the channels assigned to it. The VCA master fader allows a portion of a mix to be raised or lowered without affecting the blend of the instruments in that part of the mix.
A benefit of VCA sub-group is that since it is directly affecting the gain level of each channel, changes to a VCA sub-group level affect not only the channel level, but also all of the levels sent to any post fader mixes. With traditional audio sub-groups, the sub-group master fader only affects the level going into the main mix and does not affect the level going to the post fader mixes.
Consider the case of an instrument feeding a sub-group and a post fader mix. If you completely lower the sub-group master fader, you would no longer hear the instrument itself, but you would still hear it as part of the post fader mix, perhaps a reverb or chorus effect.
Because the VCA controls the audio level instead of the physical fader, decay of the fader mechanism over time does not cause a degradation in audio quality. VCAs were invented by David E. Blackmer , the founder of dbx , who used them to make dynamic range compressors.
Buff in A digitally controlled amplifier DCA is a variable-gain amplifier that is digitally controlled. The digitally controlled amplifier uses a stepped approach giving the circuit graduated increments of gain selection. This can be done in several fashions, but certain elements remain in any design. At its most basic form, a toggle switch strapped across the feedback resistor can provide two discrete gain settings.
While this is not a computer controlled function, it describes the core function. With eight switches and eight resistors in the feedback loop, each switch can enable a particular resistor to control the feedback of the amplifier. If each switch was converted to a relay, a microcontroller could be used to activate the relays to attain the desired amount of gain.
Relays can be replaced with Field Effect Transistors of an appropriate type to reduce the mechanical nature of the design. Other devices such as the CD bi-directional CMOS analog multiplexer integrated circuit and digital potentiometers combined resistor string and MUXes can serve well as the switching function. To minimize the quantity of switches and resistors, combinations of resistance values can be utilized by activating multiple switches.
From Wikipedia, the free encyclopedia. This section needs expansion. You can help by adding to it. July The History of Music Production.
Oxford University Press. ISBN Audio Engineering Explained. Categories : Frequency mixers Electronic amplifiers Dynamics processing Synthesiser modules. Hidden categories: Articles to be expanded from July All articles to be expanded Articles using small message boxes. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file.
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Audio power amplifier
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STK442-090 Amplifier Circuit
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Balanced Amplifiers
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Instrumentation amplifier
An amplifier , electronic amplifier or informally amp is an electronic device that can increase the power of a signal a time-varying voltage or current. It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. The amount of amplification provided by an amplifier is measured by its gain : the ratio of output voltage, current, or power to input. An amplifier is a circuit that has a power gain greater than one. An amplifier can either be a separate piece of equipment or an electrical circuit contained within another device. Amplification is fundamental to modern electronics, and amplifiers are widely used in almost all electronic equipment. Amplifiers can be categorized in different ways.
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Dumble Amplifiers
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RF power amplifier
An audio power amplifier or power amp is an electronic amplifier that amplifies low-power electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is high enough for driving loudspeakers or headphones. Audio power amplifiers are found in all manner of sound systems including sound reinforcement , public address and home audio systems and musical instrument amplifiers like guitar amplifiers. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers. The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification of the signal this is particularly associated with record turntable signals, microphone signals and electric instrument signals from pickups, such as the electric guitar and electric bass , equalization e. The inputs can also be any number of audio sources like record players , CD players , digital audio players and cassette players. Most audio power amplifiers require these low-level inputs, which are line level. While the input signal to an audio power amplifier, such as the signal from an electric guitar, may measure only a few hundred microwatts , its output may be a few watts for small consumer electronics devices, such as clock radios , tens or hundreds of watts for a home stereo system , several thousand watts for a nightclub 's sound system or tens of thousands of watts for a large rock concert sound reinforcement system.
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