Fantastic new audio amp !
in [Design]
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From: Jim Thompson on 23 Nov 2009 18:01 On Mon, 23 Nov 2009 17:08:47 -0500, Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: >On Mon, 23 Nov 2009 08:28:42 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: > >>On Mon, 23 Nov 2009 09:25:10 -0600, Vladimir Vassilevsky >><nospam(a)nowhere.com> wrote: >> >>> >>> >>>Jim Thompson wrote: >>> >>> >>>> I was always fond of touting my amplifier as 400W CONTINUOUS RMS, as >>>> opposed to those nutcases who spout "music power" or "peak power" ;-) >>> >>>Agreed. The real power, not bullshit power, tells a lot about the >>>design. However, there is one more parameter: for how long the amp can >>>sustain that power level undistorted. >>> >>> >>>Vladimir Vassilevsky >>>DSP and Mixed Signal Design Consultant >>>http://www.abvolt.com >> >>In my case "CONTINUOUS" meant exactly that ;-) >> >> ...Jim Thompson > >Notwithstanding the PMPO type of lies, I have seen serious audio work >(new patents and technology etc.) being done to maximize the music or >vocal performance from a fixed amount of power input. You _have_ to know... if _I_ built a 400W audio amplifier, it used a transformer, not a switcher, and had heat sinks with fans... took two people to carry it ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 |
From: Spehro Pefhany on 23 Nov 2009 18:25 On Mon, 23 Nov 2009 16:01:23 -0700, the renowned Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >On Mon, 23 Nov 2009 17:08:47 -0500, Spehro Pefhany ><speffSNIP(a)interlogDOTyou.knowwhat> wrote: > >>On Mon, 23 Nov 2009 08:28:42 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >> >>>On Mon, 23 Nov 2009 09:25:10 -0600, Vladimir Vassilevsky >>><nospam(a)nowhere.com> wrote: >>> >>>> >>>> >>>>Jim Thompson wrote: >>>> >>>> >>>>> I was always fond of touting my amplifier as 400W CONTINUOUS RMS, as >>>>> opposed to those nutcases who spout "music power" or "peak power" ;-) >>>> >>>>Agreed. The real power, not bullshit power, tells a lot about the >>>>design. However, there is one more parameter: for how long the amp can >>>>sustain that power level undistorted. >>>> >>>> >>>>Vladimir Vassilevsky >>>>DSP and Mixed Signal Design Consultant >>>>http://www.abvolt.com >>> >>>In my case "CONTINUOUS" meant exactly that ;-) >>> >>> ...Jim Thompson >> >>Notwithstanding the PMPO type of lies, I have seen serious audio work >>(new patents and technology etc.) being done to maximize the music or >>vocal performance from a fixed amount of power input. > >You _have_ to know... if _I_ built a 400W audio amplifier, it used a >transformer, not a switcher, and had heat sinks with fans... took two >people to carry it ;-) > > ...Jim Thompson I bet it did. The technology did not exist to build these things at a reasonable price even a decade ago. Maybe if you had BJTs made from resublimated thiotimoline. ;-) Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
From: Rich Grise on 23 Nov 2009 19:00 On Sat, 21 Nov 2009 09:56:56 +0000, TTman wrote: > 100Watts, runs from a 1.5V battery . Yes, that's correct ! So that would > be a 500AHr. single nicad then, with a 2C charger. Its true ! > http://www.audiumsemi.com/ "Fantastic" as in "a fantasy?" Thanks, Rich
From: Jim Thompson on 23 Nov 2009 19:24 On Mon, 23 Nov 2009 18:25:12 -0500, Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: >On Mon, 23 Nov 2009 16:01:23 -0700, the renowned Jim Thompson ><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: > >>On Mon, 23 Nov 2009 17:08:47 -0500, Spehro Pefhany >><speffSNIP(a)interlogDOTyou.knowwhat> wrote: >> >>>On Mon, 23 Nov 2009 08:28:42 -0700, Jim Thompson >>><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >>> >>>>On Mon, 23 Nov 2009 09:25:10 -0600, Vladimir Vassilevsky >>>><nospam(a)nowhere.com> wrote: >>>> >>>>> >>>>> >>>>>Jim Thompson wrote: >>>>> >>>>> >>>>>> I was always fond of touting my amplifier as 400W CONTINUOUS RMS, as >>>>>> opposed to those nutcases who spout "music power" or "peak power" ;-) >>>>> >>>>>Agreed. The real power, not bullshit power, tells a lot about the >>>>>design. However, there is one more parameter: for how long the amp can >>>>>sustain that power level undistorted. >>>>> >>>>> >>>>>Vladimir Vassilevsky >>>>>DSP and Mixed Signal Design Consultant >>>>>http://www.abvolt.com >>>> >>>>In my case "CONTINUOUS" meant exactly that ;-) >>>> >>>> ...Jim Thompson >>> >>>Notwithstanding the PMPO type of lies, I have seen serious audio work >>>(new patents and technology etc.) being done to maximize the music or >>>vocal performance from a fixed amount of power input. >> >>You _have_ to know... if _I_ built a 400W audio amplifier, it used a >>transformer, not a switcher, and had heat sinks with fans... took two >>people to carry it ;-) >> >> ...Jim Thompson > >I bet it did. The technology did not exist to build these things at a >reasonable price even a decade ago. Maybe if you had BJTs made from >resublimated thiotimoline. ;-) > > >Best regards, >Spehro Pefhany That 400W amplifier was around 1975-ish, for the neighbor kid who I tutored in Algebra, applying a little bribe... get "A" and we'll build you a 400W guitar amplifier ;-) He got an "A", and I got a swimming pool for around 1/2 price... his father was president of Anthony Pools ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 |
From: Joel Koltner on 23 Nov 2009 19:45
"Rich Grise" <richgrise(a)example.net> wrote in message news:pan.2009.11.24.00.00.22.409954(a)example.net... > "Fantastic" as in "a fantasy?" Yep. They say 100W "peak power" output, which of course means nothing at all. It's the same hyperbole many companies release today... they may well have some improvement that make their amplifiers a bit better (notice that nowhere to they talk about something as simple as the power *efficiency* of their designs), but they have to come up with all sorts of hype to get anyone to pay attention... or so they think. The whole "use a low voltage except when you start getting peaks at which point you switch on a boost converter and have it track the peaks" is well-known (and pretty obvious to anyone "skilled in the art") technique for high-power RF amplifiers; I have to imagine the audio guys have known about such things for decades too. ---Joel |