On Tuesday, May 16, 2017 at 2:20:04 PM UTC-4, John Larkin wrote:> On Tue, 16 May 2017 10:08:44 -0500, Tim Wescott > <tim@seemywebsite.really> wrote: > > >On Mon, 15 May 2017 11:18:36 -0700, John Larkin wrote: > > > >> On Mon, 15 May 2017 12:48:08 -0500, Tim Wescott > >> <seemywebsite@myfooter.really> wrote: > >> > >>>On Mon, 15 May 2017 09:49:45 -0500, Dave M wrote: > >>> > >>>> Has anyone used any of the consumer-grade audio power amps such as the > >>>> LM1825, TDA2030, or TDS7297 as a basic DC power opamp? > >>>> Any reason they shouldn't be used as power supply regulators, TEC > >>>> controllers, etc? > >>>> > >>>> Dave M > >>> > >>>If the super-est best-est performance isn't an issue, a plain old op-amp > >>>driving an emitter follower stage often works well, particularly in a 1- > >>>quadrant amplifier such as a regulator or TEC controller. > >> > >> Or an opamp driving the adjust pin of a 3T regulator. That has some nice > >> points. > > > >Current limit and thermal shutdown not least among them. What else? > > That's mostly it. C-load stability is good, too. And cost. > > I tried every imaginable way to destroy an LM1117 by abusing the Vadj > pin, and it survived.Student's managed to blow up an LM395, you are probably just not 'creative' enough. :^) (It involved mistakenly putting a big ass coil on the output.) George H.> > > -- > > John Larkin Highland Technology, Inc > picosecond timing precision measurement > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com
Using consumer-grade power amp as Power opamp
Started by ●May 15, 2017
Reply by ●May 16, 20172017-05-16
Reply by ●May 16, 20172017-05-16
"Winfield Hill" wrote in message news:ofdleo02voc@drn.newsguy.com... Dave M wrote...> Has anyone used any of the consumer-grade audio power amps ...>Sorry, but these days "consumer-grade audio power amps" > are all class-D. In general most of these can perform as > well as a linear amps.This, of course, depends on the colour of your ears, and their reflectability... -- Kevin Aylward http://www.anasoft.co.uk - SuperSpice http://www.kevinaylward.co.uk/ee/index.html
Reply by ●May 16, 20172017-05-16
On 05/16/2017 02:32 PM, George Herold wrote:> On Tuesday, May 16, 2017 at 2:20:04 PM UTC-4, John Larkin wrote: >> On Tue, 16 May 2017 10:08:44 -0500, Tim Wescott >> <tim@seemywebsite.really> wrote: >> >>> On Mon, 15 May 2017 11:18:36 -0700, John Larkin wrote: >>> >>>> On Mon, 15 May 2017 12:48:08 -0500, Tim Wescott >>>> <seemywebsite@myfooter.really> wrote: >>>> >>>>> On Mon, 15 May 2017 09:49:45 -0500, Dave M wrote: >>>>> >>>>>> Has anyone used any of the consumer-grade audio power amps such as the >>>>>> LM1825, TDA2030, or TDS7297 as a basic DC power opamp? >>>>>> Any reason they shouldn't be used as power supply regulators, TEC >>>>>> controllers, etc? >>>>>> >>>>>> Dave M >>>>> >>>>> If the super-est best-est performance isn't an issue, a plain old op-amp >>>>> driving an emitter follower stage often works well, particularly in a 1- >>>>> quadrant amplifier such as a regulator or TEC controller. >>>> >>>> Or an opamp driving the adjust pin of a 3T regulator. That has some nice >>>> points. >>> >>> Current limit and thermal shutdown not least among them. What else? >> >> That's mostly it. C-load stability is good, too. And cost. >> >> I tried every imaginable way to destroy an LM1117 by abusing the Vadj >> pin, and it survived. > > Student's managed to blow up an LM395, you are probably just not > 'creative' enough. :^) (It involved mistakenly putting a big ass coil > on the output.) > > George H.I remember that one--it hit the thermal limit, tried to turn off, and the inductive kick blew it up. Creative, as you say. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
Reply by ●May 16, 20172017-05-16
On Tue, 16 May 2017 20:27:57 +0100, "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> wrote:>"Winfield Hill" wrote in message news:ofdleo02voc@drn.newsguy.com... > >Dave M wrote... >> Has anyone used any of the consumer-grade audio power amps ... > >>Sorry, but these days "consumer-grade audio power amps" >> are all class-D. In general most of these can perform as >> well as a linear amps. > >This, of course, depends on the colour of your ears, and their >reflectability... > >-- Kevin Aylward >http://www.anasoft.co.uk - SuperSpice >http://www.kevinaylward.co.uk/ee/index.html > > >Try listening to class-D crap via hearing aids that are class-D :-( Class-D is for audiophools. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Thinking outside the box... producing elegant solutions. "It is not in doing what you like, but in liking what you do that is the secret of happiness." -James Barrie
Reply by ●May 16, 20172017-05-16
On Tue, 16 May 2017 20:27:57 +0100, "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> wrote:>"Winfield Hill" wrote in message news:ofdleo02voc@drn.newsguy.com... > >Dave M wrote... >> Has anyone used any of the consumer-grade audio power amps ... > >>Sorry, but these days "consumer-grade audio power amps" >> are all class-D. In general most of these can perform as >> well as a linear amps. > >This, of course, depends on the colour of your ears, and their >reflectability... >I can make a fortune selling golden ear makeup. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●May 17, 20172017-05-17
On Tue, 16 May 2017 16:02:47 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>On 05/16/2017 02:32 PM, George Herold wrote: >> On Tuesday, May 16, 2017 at 2:20:04 PM UTC-4, John Larkin wrote: >>> On Tue, 16 May 2017 10:08:44 -0500, Tim Wescott >>> <tim@seemywebsite.really> wrote: >>> >>>> On Mon, 15 May 2017 11:18:36 -0700, John Larkin wrote: >>>> >>>>> On Mon, 15 May 2017 12:48:08 -0500, Tim Wescott >>>>> <seemywebsite@myfooter.really> wrote: >>>>> >>>>>> On Mon, 15 May 2017 09:49:45 -0500, Dave M wrote: >>>>>> >>>>>>> Has anyone used any of the consumer-grade audio power amps such as the >>>>>>> LM1825, TDA2030, or TDS7297 as a basic DC power opamp? >>>>>>> Any reason they shouldn't be used as power supply regulators, TEC >>>>>>> controllers, etc? >>>>>>> >>>>>>> Dave M >>>>>> >>>>>> If the super-est best-est performance isn't an issue, a plain old op-amp >>>>>> driving an emitter follower stage often works well, particularly in a 1- >>>>>> quadrant amplifier such as a regulator or TEC controller. >>>>> >>>>> Or an opamp driving the adjust pin of a 3T regulator. That has some nice >>>>> points. >>>> >>>> Current limit and thermal shutdown not least among them. What else? >>> >>> That's mostly it. C-load stability is good, too. And cost. >>> >>> I tried every imaginable way to destroy an LM1117 by abusing the Vadj >>> pin, and it survived. >> >> Student's managed to blow up an LM395, you are probably just not >> 'creative' enough. :^) (It involved mistakenly putting a big ass coil >> on the output.) >> >> George H. > >I remember that one--it hit the thermal limit, tried to turn off, and >the inductive kick blew it up. Creative, as you say. ;) > >Cheers > >Phil HobbsIt just lost the will to live. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●May 17, 20172017-05-17
On Tuesday, 16 May 2017 18:53:27 UTC+1, Dave M wrote:> I might give a shot at using one as a DC power supply regulator, or maybe to > drive a power transformer or audio output transformer to make an AC voltage > reference. I've wanted one of those for a long time. Hmmm... I wonder how > they would like being run as BTL amps?I used to run TDA20nn as BTL without problem. Why wouldn't they? NT
Reply by ●May 17, 20172017-05-17
"Jim Thompson" wrote in message news:p71nhcpc8djf4im089o8js57gsg4q5ksuc@4ax.com... On Tue, 16 May 2017 20:27:57 +0100, "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> wrote:>"Winfield Hill" wrote in message news:ofdleo02voc@drn.newsguy.com... > >Dave M wrote... >> Has anyone used any of the consumer-grade audio power amps ... > >>Sorry, but these days "consumer-grade audio power amps" >> are all class-D. In general most of these can perform as >> well as a linear amps. > >This, of course, depends on the colour of your ears, and their >reflectability... > >-- Kevin Aylward >http://www.anasoft.co.uk - SuperSpice >http://www.kevinaylward.co.uk/ee/index.html > > >>Try listening to class-D crap via hearing aids that are class-D :-(>Class-D is for audiophools.I have 5 kW of pro audio power amps, none of them are class D. The weigh a bit, but its just an addition to my few times a week weight training at the gym. I am only 60kg, so I need the practice. -- Kevin Aylward http://www.anasoft.co.uk - SuperSpice http://www.kevinaylward.co.uk/ee/index.html
Reply by ●May 17, 20172017-05-17
On Wed, 17 May 2017 19:34:11 +0100, "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> wrote:>"Jim Thompson" wrote in message >news:p71nhcpc8djf4im089o8js57gsg4q5ksuc@4ax.com... > >On Tue, 16 May 2017 20:27:57 +0100, "Kevin Aylward" ><kevinRemovAT@kevinaylward.co.uk> wrote: > >>"Winfield Hill" wrote in message news:ofdleo02voc@drn.newsguy.com... >> >>Dave M wrote... >>> Has anyone used any of the consumer-grade audio power amps ... >> >>>Sorry, but these days "consumer-grade audio power amps" >>> are all class-D. In general most of these can perform as >>> well as a linear amps. >> >>This, of course, depends on the colour of your ears, and their >>reflectability... >> >>-- Kevin Aylward >>http://www.anasoft.co.uk - SuperSpice >>http://www.kevinaylward.co.uk/ee/index.html >> >> >> > >>Try listening to class-D crap via hearing aids that are class-D :-( > >>Class-D is for audiophools. > >I have 5 kW of pro audio power amps, none of them are class D. > >The weigh a bit, but its just an addition to my few times a week weight >training at the gym. I am only 60kg, so I need the practice. > >-- Kevin Aylward >http://www.anasoft.co.uk - SuperSpice >http://www.kevinaylward.co.uk/ee/index.htmlI fondly remember my first UltraLinear... with power and output transformers it took two people to carry it ;-) ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Thinking outside the box... producing elegant solutions. "It is not in doing what you like, but in liking what you do that is the secret of happiness." -James Barrie
Reply by ●May 18, 20172017-05-18
Kevin Aylward wrote: ---------------------> > > > >Class-D is for audiophools. > > I have 5 kW of pro audio power amps, none of them are class D. > > The weigh a bit, but its just an addition to my few times a week weight > training at the gym. I am only 60kg, so I need the practice. > > >** Have you come across the Behringer iNUKE amps yet ?? SMPSs plus class D output stages. I tested an iNUKE 6000 recently and found it pretty much meets all its specs - with the switching transformer and output FETs running reasonably cool. I found it puts out 2500wpc with low THD - about 0.3%. https://www.sweetwater.com/store/detail/NU6000 Weighs under 12 pounds and sells for around $US350. A real game changer. ..... Phil
