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Tag Archive: amplifiers

An amplifier is an electronic device that takes a weak signal on its input and delivers a stronger version of the signal on it's output. The input signal is taken from the external source of such a signal, which is typically a low power device. Hence, we need to ensure that we do not "load" this device too much. Hence it is typical, that the input impedance of a typical audio amplifier is fairly high, normally at least 47 kilo-ohms or much more. Typical input voltage signals accepted by an audio amplifier are in the order of magnitude say 0,1V ~2V peak to peak. The amplifier increases both the voltage, as well as the power of the input signal. It is equipped with a powerful power supply, which is capable of delivering significant peaks of energy. In essence, you may consider the amplifier to be nothing more but a specialized .... power supply - but one, in which we can modulate the output voltage, so that it precisely follows a scaled up image of the input signal. The amp uses energy from its power supply to modulate the output, so as to match the input signal shape, but with a larger amplitude. Quality of amplifiers may be assesed by various parameters, including: Voltage Gain, or the multiplication factor by which the input signal voltage is scaled up to an output signal voltage; Bandwidth, the frequency range of the device; Efficiency, the amount of music power delivered in comparison to the total power taken from the electricity grid; Linearity, the degree of proportionality between input and output, or lack of distortion Noise, a measure of undesired hum or other noise that is mixed into the output Output dynamic range, the ratio of the largest and the smallest useful output levels Slew rate, the maximum rate of change of the output Rise time, settling time, ringing and overshoot that characterize the step response Stability, the ability to avoid self-oscillation An amplifier can refer to anything from an electrical circuit that uses a single active component, to a complete system such as a packaged audio hi-fi amplifier. They have some kind of gain, or multiplication factor that relates the magnitude of the output signal to the input signal. The gain may be specified as the ratio of output voltage to input voltage (voltage gain), output power to input power (power gain), or some combination of current, voltage, and power. In many cases, with input and output in the same unit, gain is unit-less (though often expressed in decibels). For others this is not necessarily so. For example, a transconductance amplifier has a gain with units of conductance (output current per input voltage). The power gain of an amplifier depends on the source and load impedances used as well as its voltage gain; while an RF amplifier may have its impedances optimized for power transfer, audio and instrumentation amplifiers are normally employed with amplifier input and output impedances optimized for least loading and highest quality. So an amplifier that is said to have a gain of 20 dB might have a voltage gain of ten times and an available power gain of much more than 20 dB (100 times power ratio), yet be delivering a much lower power gain if, for example, the input is a 600 ohm microphone and the output is a 47 kilohm power amplifier's input socket. In most cases an amplifier should be linear; that is, the gain should be constant for any combination of input and output signal. If the gain is not constant, e.g., by clipping the output signal at the limits of its capabilities, the output signal is distorted. There are however cases where variable gain is useful. There are many types of electronic amplifiers, commonly used in radio and television transmitters and receivers, high-fidelity ("hi-fi") stereo equipment, microcomputers and other electronic digital equipment, and guitar and other instrument amplifiers. Critical components include active devices, such as vacuum tubes or transistors.

Nov 19 2014

Mini AudioShow w Krakowie …

Nautilus 1

“…. Jako że powrót Spendorów SP-100R2 w wersji Vintage wzbudził bardzo duże zainteresowanie podczas wystawy Audio Show w Warszawie, Firma NAUTILUS postanowiła skompletować praktycznie taki sam system i pograć nim do końca przyszłego tygodnia w ich krakowskim salonie. Tych, którzy z różnych powodów nie dojechali w ostatni weekend, Nautilus zaprasza serdecznie!  …” Taką informację znalazłem …

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Permanent link to this article: http://hiend-audio.com/2014/11/19/mini-audioshow-w-krakowie/

Nov 19 2014

Elizabeth Spano (piano)

music notes

https://www.youtube.com/watch?feature=player_embedded&v=yb3oNeDh3Pg http://www.elizabethspano.org    

Permanent link to this article: http://hiend-audio.com/2014/11/19/elizabeth-spano-piano/

Nov 18 2014

AudioShow 2014 – Warsaw … PHOTOS !!!!

as

BETTER resolution photos of the AudioShow 2014 in Warsaw are available HERE: https://plus.google.com/u/0/104760242007820455752/photos/p/pub Please remember to press the MORE button … There is close to 700 photographs to be seen. Not all are initially visible – unless you press the MORE at the end of the displayed set. Best Regards, http://hiend-audio.com/ Link to the Photos …

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Permanent link to this article: http://hiend-audio.com/2014/11/18/audioshow-2014-warsaw-in-progress/

Nov 17 2014

The Gryphon Mephisto Mono – A piece of Art

Electrical

The Gryphon Mephisto Mono – a piece of Electronic Art. The information pertaining to this exciting product was reprinted with the kind consent of Gryphon Audio Designs. Details pertaining to this product to be found at:  www.gryphon-audio.com. They said it could not be done. Or maybe they just meant that it shouldn’t be done in a …

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Permanent link to this article: http://hiend-audio.com/2014/11/17/the-gryphon-mephisto-mono-a-piece-of-art/

Nov 17 2014

Intelligent 240 x 128 LCD display

LCD graphics

DIY Folks, Here is an intelligent LCD display, 240 x 128, which is easy to use and implement within your various constructs and devices. It is the EA eDIP240-7 – the world’s first display with integrated intelligence! As well as a number of builtin fonts which can be used with pixel accuracy it also features a whole …

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Permanent link to this article: http://hiend-audio.com/2014/11/17/intelligent-240-x-128-lcd-display/

Nov 17 2014

HiFiMAN HM-650 + DOCK-1 + Definitive Technology Mythos ST-L

ST-L 2

HiFiMAN, jeden z liderów i pionierów rynku w zakresie renomowanych, eksluzywnych, oraz jednych z lepszych światowych słuchawek planarnych oraz hi-endowych odtwarzaczy przenośnych, pokazał na warszawskich targach AudioShow dwa zupełnie nowe urządzenia, a ich światowa premiera miała miejsce właśnie w Polsce! 1. HiFiMAN HM-650 – odtwarzacz przenośny klasy hi-end, następca legendarnego HM-601. Urządzenie można było wypróbować ze słuchawkami HE-400i …

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Permanent link to this article: http://hiend-audio.com/2014/11/17/hifiman-hm-650-dock-1-definitive-technology-mythos-st-l/

Nov 17 2014

Zeta Zero – Tomasz Rogula

3000wrms 2

Zeta Zero – is a Polish company that produces speakers. Expensive, High Quality speakers. Beautiful, at that. But the sentences as prior – do not give you a fair representation of the passion, the drive, the determination, and the sheer clout of the commitment that is nested in Tomasz Rogula – the guy who produces …

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Permanent link to this article: http://hiend-audio.com/2014/11/17/zeta-zero-tomasz-rogula/

Nov 16 2014

Transformers by Reuben Lee (VIAS Library)

Transformers

Transformers – By Reuben Lee. This is yet another valuable link to a good reading resource This time on the build, concepts and workings for transformers. http://www.vias.org/eltransformers This is also a linked sourced from the VIAS Library. http://www.vias.org/electronics.html The Virtual Institute of Applied Science (VIAS) has been founded by Hans Lohninger to supply high-quality learning …

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Permanent link to this article: http://hiend-audio.com/2014/11/16/transformers-by-reuben-lee-vias-library/

Nov 16 2014

Easy Reading “Basic Audio” – Norman Crowhurst (1959).

Basic Audio Crowhurst

Easy Reading – Great Stuff … Basic Audio by Norman Crowhurst. http://www.vias.org/crowhurstba/editorial.html This edition of the eBook “Basic Audio” is based on the printed copy of Norman Crowhurst’s three volume book “Basic Audio” published in 1959. As the copyright of this book has not been renewed in 1964 it has fallen into public domain (click here for more …

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Permanent link to this article: http://hiend-audio.com/2014/11/16/easy-reading-basic-audio-norman-crowhurst-1959/

Nov 16 2014

Gsonic Work-In-Progress

Gsonic 0.93Z (14) b

A new design is in the works … At this moment I shall disclose only some sneaky shots … Nowy projekt kolumn głośnikowych właśnie powstaje. … Na chwilę obecną pokazuję jedynie kilka ukradkiem zrobionych fotografii …  

Permanent link to this article: http://hiend-audio.com/2014/11/16/gsonic-work-in-progress/

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