Category: Control amplifiers

Control amplifiers

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MusicRadar Basics: guitar amplifier controls explained

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We will take the input signal from a simple input, multiply it by 2 and send it to the simple output pin. The programs reads the input from p0 and puts it in acc. Then it multiplies it by two inside acc and moves the result in acc to the output p1.

control amplifiers

Finally we sleep until the next cycle. If we start studying the input signal, we will see that we only have values of 0, 25 and Which means that the output values always needs to be either 0, 50 or Therefore we should be able to make use of a logic gate to make a solution that is more expensive, since we use more components, but that should reduce the lines of code as well as reduce the energy consumption.

For the case of 50 as an input. For the 0 case we just need to make sure that we do not send any output. For the last case of 25 as input the logic gate will provide no output, therefore we can use the mc microcontroller to test if the value of p0 is larger than the output at p1, and in that case send 50 as the output. I thought I could just check if p0 was equal to 25, but I realized I needed to read from p1 as well, as that will reset sending an output signal to it.

And therefore implicitly also reset the output to 0 in case nothing should be sent. It is a solution that you should not be able to do at the time you reach that level for the first time. But it is something you can come back and do. Sign up for the Mathblog newsletter, and get updates every two weeks. I promise I will include cool tidbits for you. Email address:.

Ways to control your amp volume.

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Please try your search again later.Is that crackling and popping when you turn the controls on your amp driving you crazy? Here's how to clean them and get back to the music. There are spray "contact cleaners" available for this purpose, but in most cases just mixes the dirt and grime already inside with more dirt and assembly grease and may make the control operate worse than it is already.

Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. The first step is to remove the knobs and nuts mounting the controls to the front panel to the amplifier.

Remember to keep all the parts sorted so you can find them later. After the circuit board is removed from the amplifier box, each control is removed and cleaned one part at a time. Do not take them all off at the same time, because you may mix them up. Open the control potentiometer or "pot" by lifting the mounting tabs slightly. Remember that these tabs will not handle being bent more than a few times before they break off. If a tab breaks off, you may be able to solder it back on later.

The control is made up of two main parts. The contacts and the carbon resistor. Each side must be cleaned without damaging them further. If the carbon looks burnt or has broken areas, the entire control may need to be replaced. If the contacts are worn too much or broken, the entire control may need to be replaced.

Carefully, clean the contacts and carbon with a pencil eraser. Do not push too hard, and clean the eraser on a piece of paper when it gets too dirty. Do not use any cleaner or solvent except rubbing alcohol or cleaner designated for this type of control. Make sure to blow off any eraser particles left on the control before assembling the part. If you are cleaning a dual control, the method will be the same, however it will take twice as long, and you must align both controls so they go back together correctly.

Being careful not to forget any parts, recrimp the case making sure not to bend the case or trap any parts between the case and the parts inside. Turn the control and check for a nice smooth motion from the 0 to 10 locations.

control amplifiers

The control should move approx. If you think you assembled one incorrectly, set it aside, and open the next one to look at how it should be assembled to fix the last one. If you need to, take pictures of each phase to help you reassemble the parts later. Try not to get any grease or oil on the contacts while assembling the part.Home Ways to control your amp volume.

By and large one of the most discussed topics in our shop when it comes to tube amps is volume. The first question a lot of customers ask right from the start is "how loud? Unfortunately, the question is kind of a difficult one to answer with any sort of brevity.

There are just so many variables, and honestly when you think about it it is hard to find a scale to really quantify such a thing. This puts us guitar players in kind of a tough spot because it really does matter how loud an amp is for a number of reasons. The funny thing is, more times than not, we should be worried about an amp that is "too loud" rather than one that is "not loud enough.

In order to get the best tone out of a tube amp it's crucial to understand how tubes react as the volume is increased. One of the main reasons that players opt for tube amps over solid state is the natural compression and warmth that a tube produces when it is pushed. No matter what you hear from the guys that sell modeling amps, there really is no substitute for a good old-fashioned-cranked tube amp.

The problem is most tube amps are ridiculously loud by the time they are pushed to the point of sounding their best.

For years guitar players have struggled with this problem, but recently a few amp builders have come up with some pretty effective ways to get the tone without the tinnitus. In this article, we look at a few approaches that we think do a good job of tackling this problem. In a very basic sense, the idea behind a master volume is to be able to adjust the preamp and the power amp volumes independently of each other, thus giving a player the ability to control how much the amp is "breaking up" or overdriving while still keeping the volume at a respectable level if there is such a thing.

If a player wants to push the amp a little harder they can increase the "normal" volume and back off on the "master" volume and the amp will now be able to be pushed into overdrive without the much added volume. The reason for this is that by increasing the "normal volume" the amp's preamp is producing more gain, but since the power section "master volume" is set lower, the signal is not being amplified as much. In our experience, this makes the amp considerably more flexible.

Over the years, we have encountered some skepticism surrounding amps with master volumes. A lot of this goes back to some of the very early designs, ones in which some players felt had a negative effect on tone. The early master volume circuits were nowhere near as "refined" as the circuits you find on many of the boutique amps of today. Honestly, in our experience a master volume has zero drawbacks, in fact if anything it gives the player a tremendous amount more control over how the amp responds.

For many players it has become almost a "must-have". Here are a few amps that we carry that have master volumes: Dr.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 reinforcementpublic 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 bassequalization e.

The inputs can also be any number of audio sources like record playersCD playersdigital 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 microwattsits output may be a few watts for small consumer electronics devices, such as clock radiostens or hundreds of watts for a home stereo systemseveral thousand watts for a nightclub 's sound system or tens of thousands of watts for a large rock concert sound reinforcement system.

While power amplifiers are available in standalone units, typically aimed at the hi-fi audiophile market a niche market of audio enthusiasts and sound reinforcement system professionals, most consumer electronics sound products, such as clock radiosboom boxes and televisions have relatively small power amplifiers that are integrated inside the chassis of the main product. The audio amplifier was invented around by Lee De Forestmade possible by his invention of the first practical amplifying electrical component, the triode vacuum tube or "valve" in British English in The triode was a three terminal device with a control grid that can modulate the flow of electrons from the filament to the plate.

The triode vacuum amplifier was used to make the first AM radio. Audio power amplifiers based on transistors became practical with the wide availability of inexpensive transistors in the late s. Since the s, most modern audio amplifiers are based on solid-state transistors, especially the bipolar junction transistor BJT and the metal—oxide—semiconductor field-effect transistor MOSFET. Transistor-based amplifiers are lighter in weight, more reliable and require less maintenance than tube amplifiers.


In the s, there are still audio enthusiasts, musicians particularly electric guitaristselectric bassistsHammond organ players and Fender Rhodes electric piano players, among othersaudio engineers and music producers who prefer tube-based amplifiers, and what is perceived as a "warmer" tube sound.

Key design parameters for audio power amplifiers are frequency responsegainnoiseand distortion.

control amplifiers

These are interdependent; increasing gain often leads to undesirable increases in noise and distortion. While negative feedback actually reduces the gain, it also reduces distortion. Most audio amplifiers are linear amplifiers operating in class AB. Until the s, most amplifiers were tube amplifiers which used vacuum tubes. During the s, tube amps were increasingly replaced with transistor -based amplifiers, which were lighter in weight, more reliable, and lower maintenance.

Nevertheless, there are still niche markets of consumers who continue to use tube amplifiers and tube preamplifiers in the s, such as with home hi-fi enthusiasts, audio engineers and music producers who use tube preamplifiers in studio recordings to "warm up" microphone signals and electric guitarists, electric bassists and Hammond organ players, of whom a minority continue to use tube preamps, tube power amps and tube effects units.

While hi-fi enthusiasts and audio engineers doing live sound or monitoring tracks in the studio typically seek out amplifiers with the lowest distortion, electric instrument players in genres such as bluesrock music and heavy metal musicamong others, use tube amplifiers because they like the natural overdrive that tube amps produce when pushed hard.

In the s, the Class-D amplifierwhich is much more efficient than Class AB amplifiers, is widely used in consumer electronics audio products, bass amplifiers and sound reinforcement system gear, as Class D amplifiers are much lighter in weight and produce much less heat.

Since modern digital devices, including CD and DVD players, radio receivers and tape decks already provide a "flat" signal at line level, the preamp is not needed other than as a volume control and source selector. One alternative to a separate preamp is to simply use passive volume and switching controls, sometimes integrated into a power amplifier to form an integrated amplifier. The final stage of amplification, after preamplifiers, is the output stage, where the highest demands are placed on the transistors or tubes.

For this reason, the design choices made around the output device for single-ended output stages, such as in single-ended triode amplifiers or devices for push-pull output stagessuch as the Class of operation of the output devices is often taken as the description of the whole power amplifier.

For example, a Class B amplifier will probably have just the high power output devices operating cut off for half of each cycle, while the other devices such as differential amplifier, voltage amplifier and possibly even driver transistors operate in Class A. For some years following the introduction of solid state amplifiers, their perceived sound did not have the excellent audio quality of the best valve amplifiers see valve audio amplifier.Exquisite sound, flagship pedigree.

A dream come true. Just like our top of the range model, the Cu, the Cu features the new LECUA high precision electronically controlled attenuator in an unbalanced configuration.

An accurate volume adjustment mechanism is fundamental to the operation of a control amplifier. The LECUA circuit uses stepped fixed resistance and increasing the number of steps from 72 to 88 allows more delicate volume control adjustments from 0dB to 87dB with no deterioration of sound quality.

This circuit also accurately handles any left and right balance adjustments. Only the distorted components of the audio signal are fed back to the amplification circuit to optimize the negative feedback effect. Increased primary slew rate and ultra-wide bandwidth contribute to an extremely low level of distortion, especially in the high frequency range.

An improved signal to noise ratio allows the full expression of delicate musical pieces where the amount of feedback should be minimal. This circuit creates a firm power base to support the sound quality of the Cu. The highly visible fluorescent display is equipped with a dimmer and has a four level zoom mode, adjusted via the remote control.

The two part display usually displays the input source and volume level and is also eye-friendly and clearly visible from the listening position. The Cu is equipped with unbalanced external pre-amp input terminals to which an external pre-amplifier in your AV system may be connected.

The balanced inputs have the option of phase switching pin no. This is useful for connecting to units made by other manufacturers. The ultimate solution for a high class control amplifier is realized by the direct connection between the attenuator circuit and the amplification circuit, eliminating the concept of independent, individual circuit blocks.

control amplifiers

A loopless chassis structure has been used for the enclosure to eliminate increased ground impedance and the effects generated by electrical or magnetic fields.

Cast-iron isolator legs prevent resonance thanks to the characteristics of their metallic structure, the density gradient decreases from the center to the periphery of each leg. The legs also eliminate adverse effects caused by vibration and effects from the power transformer or the supporting surface. The Cu features original custom made components, such as resistors, capacitors and even the unit's entire wiring, designed or selected as a result of LUXMAN's advanced experience and sensibility, accumulated over a long history of designing audio products.

We consider sound quality as our first priority. The slim aluminum remote control feels comfortable in the hand and allows users to operate a wide variety of the Cu's functions, such as input selection, volume adjustment, display zoom and dimming, loudness and more from the listening position.

Gallery Spec Download. Zoom display mode The highly visible fluorescent display is equipped with a dimmer and has a four level zoom mode, adjusted via the remote control. External pre-input terminals and balanced phase selection The Cu is equipped with unbalanced external pre-amp input terminals to which an external pre-amplifier in your AV system may be connected.

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