amplifier

Amplifier
An amplifier, electronic amplifier or (informally) amp is an electronic device that increases the power of a signal.
It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In this sense, an amplifier modulates the output of the power supply to make the output signal stronger than the input signal. An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss.
An amplifier can either be a separate piece of equipment or an electrical circuit within another device. The ability to amplify is fundamental to modern electronics, and amplifiers are extremely widely used in almost all electronic equipment. The types of amplifiers can be categorized in different ways. One is by the frequency of the electronic signal being amplified; audio amplifiers amplify signals in the audio (sound) range of less than 20 kHz, RF amplifiers amplify frequencies in the radio frequency range between 20 kHz and 300 GHz. Another is which quantity, voltage or current is being amplified; amplifiers can be divided into voltage amplifiers, current amplifiers, transconductance amplifiers, and transresistance amplifiers. A further distinction is whether the output is a linear or nonlinear representation of the input. Amplifiers can also be categorized by their physical placement in the signal chain.
The first practical electronic device that amplified was the Audion (triode) vacuum tube, invented in 1906 by Lee De Forest, which led to the first amplifiers. The terms "amplifier" and "amplification" (from the Latin amplificare, 'to enlarge or expand') were first used for this new capability around 1915 when triodes became widespread.
For the next 50 years, vacuum tubes were the only devices that could amplify. All amplifiers used them until the 1960s, when transistors appeared. Most amplifiers today use transistors, though tube amplifiers are still produced.
Amplifier - Wikipedia, the free encyclopedia
  1. 1

    Which 11-ch amp?

    I've got a bit of upgrade-itis, and want to simplfy and create a bit of space where all my kit is, as its very cramped and massive pain to get to. So, currently I have an AVM60 processor, connected to a Nakamichi AVP1 for the 7-ch base layer, and then 2x Crown XLS-1002 for the 2 pairs of Atmos...
  2. dollag

    Deal Agreed Soncoz SGP-1 (SOLD) & Lyngdorf tdai 1120

    sgp1- Selling as not using anymore. Had a very easy life as was used to power my hifiman susvara headphones. Is 14 months old. Originally purchased as preferred over my trusted ahb2 which i ended up selling. Whilst it measured better than pretty much any other amplifier, i felt it had a more...
  3. P

    For Sale Denon AVR-2312

    For sale is my trusty Denon AVR-2312 in full working order. Comes with all original accessories and in its original box: manual, microphone, antenna, remote control, power cable. Running absolutely fine without any issues, only selling due to upgrade. Cosmetically a few light scratches but...
  4. P

    sonos connect amp gen1 + speakers suggestion

    hello, i own 2x sonos connect amp gen1, and trying to figure out which speakers to buy 1) for bathroom in ceiling installation 2) kitchen 2) here i am not sure if in-ceiling is a way or what about speakers like b&w m1 mk1? Thank you so much!
  5. hidave

    Deal Agreed IOTAVX AVXP1 7 CHANNEL POWER AMPLIFIER

    IOTAVX AVXP1 7 Channel power amplifier I am the original owner in good condition with a few light scratches on the faceplate i have tried to capture them in the photos Amp in full workinging order no hum no hiss all channels working properly changing as i am going for all Emotiva amps...
  6. mickemo

    Stereo Amp for Vinyl (integrated into Home Cinema) - Advice sought

    Folks I’m seeking your collective wisdom and guidance for the next improvement for my Hi-Fi / Home Cinema system. Current set up Marantz Cinema50 (audyssey only) Rega Planar 3 + Exact Rega Fono ( not in use currently and can’t seem to get in working with the Cinema50) C/Audio Azure 651 BD SACD...
  7. Bassman1

    For Sale Arcam P429 Power Amplifier

    Arcam P429 Class G Power Amplifier for sale. In very good condition and full working order. Comes boxed with instruction manual, power cable and paper work. Originally bought of a forum member who had the power module replaced by Arcam, paper work included.
  8. mpop

    Wanted REL t7x Subwoofer

    On the hunt for a REL t7x sub. If you're thinking to sell or have one on sale please get in touch. Also looking for a KEF R2C. I can drive and collect within reasanable distance from Surrey. Many thanks.
  9. P

    Question Equaliser AND AV input - impossible with 9000a?

    Trying to make this as simple a question as possible... Current setup sees Denon AVR-X4700H front l+r pre-outs via RCA to Audiolab 9000a 'Power' input. CD player and Sonos Connect via SPDIF to Audiolab 9000a digital inputs. Listening to AV I set the 9000 to 'Pre-Power' mode to simply take the...
  10. P

    Question Digital input preventing amp auto-standby

    Soooo...... tiny problem to have, but one that's been annoying me for a few years... I have a Denon PMA-60 with an auto-standby feature. I feed a Sonos Connect into it via optical, and a CD player into it via SPDIF. When the CD isn't spinning, the amp displays 'unlocked' and will auto-standby...
  11. J

    For Sale Lyngdorf TDAI 2170 integrated Amp

    Lyngdorf TDAI 2170 for sale. Includes Amp Remote control Microphone and cable Full HDMI and Analogue audio modules upgraded I’m keeping the boom stand Minor wear and tear on knob Price to sell prefer pick up but happy to pack up if you arrange courier and insurance
  12. S

    32 year old PSB Alphas with new amp - fun experiment

    I was in my garage and found my dusty old, 32 year old PSB Alphas (made in Canada, not off-shore as is common now), my first set of speakers- that I listened to for several years in the early 90s when I started my listening journey. For fun, I dusted them off, connected them to my small NAD...
  13. GeneG

    Sony STR-ZA2100ES

    I am using Sony STR-ZA2100ES with BOSTON ACOUSTICS VR-M60, PV-1000, VR-MC, VR-MX. Run Disney's WOW calibration disk for picture and sound. For some reason high frequencies are cut off on my central chanel. Loked in setup (on screen) and could not find any settings for that. Any ideas where to...
  14. explicitlyrics

    Wanted 3 zone amplifier

    I am trying to help a friend out who has a bunch of ceiling speakers installed but has never had them connected to anything, so Im looking for an amplifier that can push audio to 3 different zones. I know I could get 3x Sonos Amps or Wiim Amps, but they are ludicrously expensive and his budget...
  15. B

    Question Connections from streamer to amp

    My Cambridge CXN V2 streamer is connected via coax digital cable to my Arcam A15 amp digital input. Flicking through the manual for the streamer I noticed that connection to the amp in this way bypasses the streamer dac and uses the Arcam dac instead, which I never knew. This appears to me to...
  16. J

    Wanted Anthem Mca 225 gen 1 amp

    I am looking for an Anthem mca 225 gen 1 power amp. It has to be generation 1 to match my 525’s.
  17. GTR BaDBoY

    For Sale Denon AVR-X8500H / Silver

    Selling on behalf for my Dad is his Denon 13.2 4K AV Flagship Receiver finished in Silver. Complete with all accessories and original box with packaging. In perfect working order. Purchased in 2020 from Peter Tyson. Hasn't been used at all in the last 18 months as house move to smaller house...
  18. J

    For Sale Lexicon LX-7 Power Amplifier

    Lexicon LX-7 Power Amplifier. Owned by me for about the last 6 years, but moving house and I’ve not used it for at least 2 1/2 years, so no longer required. 7 channels at 200w per channel. One of the channels didn’t work when I bought it, but I had a new board fitted. The amp could do with a...
  19. M

    Home Ceiling Sound Setup

    Hi All, Very new to this sort of stuff. So I bough a house which had speakers fitted into the celling and wishing to find the best / cost effective solutions to get them going. The diagram bellow shows 4 sets of speakers in different rooms. In the Bedroom the wire are accessible in the same...
  20. A

    Sony STRDN 1080 bi amp

    I have Sony strdn 1080 and have set up Monitor Audio silver 100 as bi amped from the Sony. The problem I now have is the HI side seems too loud with the upper frequencies sounding far to bright and over powering I can find no way of lowering the volume of the HI speakers. Even if I set the...
Back
Top Bottom