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Re: Using consumer-grade power amp as Power opamp

From "Dave M" <dgminala@mediacombb.net>
Newsgroups sci.electronics.design
References <J8SdnQ82rpuXXYTEnZ2dnUU7-KvNnZ2d@giganews.com> <5f2e2cb9-15f1-47c0-bdf9-a2b401bc121a@googlegroups.com> <f2cdb698-3390-4ff3-bf71-60a7294c6664@googlegroups.com> <977f9d93-d841-4d1b-a61f-21f7e6a7fb10@googlegroups.com>
Subject Re: Using consumer-grade power amp as Power opamp
Date 2017-05-16 13:00 -0500
Message-ID <_IqdncsqMN-7o4bEnZ2dnUU7-RfNnZ2d@giganews.com> (permalink)

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George Herold wrote:
> On Monday, May 15, 2017 at 8:15:36 PM UTC-4, Phil Allison wrote:
>> George Herold wrote:
>>
>> -------------------------
>>> On Monday, May 15, 2017 at 10:49:56 AM UTC-4, 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
>>>
>>> Only the TDA2030 comes up in a search (as obsolete) check your part
>>> numbers.
>>>
>>
>>   ** Dave's list is full of typos.
>>
>> It should read: LM1875, TDA2030 and TDA7294
>>
>>
>> ....  Phil
> Thanks Phil,  The schematics for the LM1875 looks like the
> LM675.  Which is an oldie, but I still use it.
> (Again as you say it wants to run at a gain of 10 and above.)
>
> George H.
>>
>>> I'm guessing the DC performance is not as good as it could be.
>>> Lots of DC offset perhaps.
>>>
>>> George H.


Yep, sorry for the typos... I had a visit to my opthalmologist that day and 
looking at anything that emitted light was like staring into the sun, so 
please forgive.

Right about the gain... that caution is mentioned on the first page of the 
LM1875.  DC offset coltage & current are only specified at 25C, and isn't 
great, for sure.


Dave M

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Thread

Using consumer-grade power amp as Power opamp "Dave M" <dgminala@mediacombb.net> - 2017-05-15 09:49 -0500
  Re: Using consumer-grade power amp as Power opamp Don Y <blockedofcourse@foo.invalid> - 2017-05-15 08:09 -0700
    Re: Using consumer-grade power amp as Power opamp "Dave M" <dgminala@mediacombb.net> - 2017-05-16 12:53 -0500
      Re: Using consumer-grade power amp as Power opamp tabbypurr@gmail.com - 2017-05-17 03:04 -0700
      Re: Using consumer-grade power amp as Power opamp mrdarrett@gmail.com - 2017-05-18 09:02 -0700
  Re: Using consumer-grade power amp as Power opamp George Herold <gherold@teachspin.com> - 2017-05-15 08:18 -0700
    Re: Using consumer-grade power amp as Power opamp Phil Allison <pallison49@gmail.com> - 2017-05-15 17:15 -0700
      Re: Using consumer-grade power amp as Power opamp George Herold <gherold@teachspin.com> - 2017-05-16 05:49 -0700
        Re: Using consumer-grade power amp as Power opamp "Dave M" <dgminala@mediacombb.net> - 2017-05-16 13:00 -0500
  Re: Using consumer-grade power amp as Power opamp Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-15 15:57 +0000
  Re: Using consumer-grade power amp as Power opamp John Larkin <jjlarkin@highlandtechnology.com> - 2017-05-15 09:02 -0700
  Re: Using consumer-grade power amp as Power opamp Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-15 09:03 -0700
    Re: Using consumer-grade power amp as Power opamp Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-15 16:07 +0000
      Re: Using consumer-grade power amp as Power opamp John Larkin <jjlarkin@highlandtechnology.com> - 2017-05-15 09:17 -0700
        Re: Using consumer-grade power amp as Power opamp Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-15 16:46 +0000
          Re: Using consumer-grade power amp as Power opamp John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-15 10:08 -0700
            Re: Using consumer-grade power amp as Power opamp Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-15 11:13 -0700
            Re: Using consumer-grade power amp as Power opamp Clifford Heath <clifford.heath@gmail.com> - 2017-05-16 10:14 +1000
              Re: Using consumer-grade power amp as Power opamp Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-16 08:36 +0000
  Re: Using consumer-grade power amp as Power opamp Tim Wescott <seemywebsite@myfooter.really> - 2017-05-15 12:48 -0500
    Re: Using consumer-grade power amp as Power opamp John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-15 11:18 -0700
      Re: Using consumer-grade power amp as Power opamp Tim Wescott <tim@seemywebsite.really> - 2017-05-16 10:08 -0500
        Re: Using consumer-grade power amp as Power opamp John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-16 11:19 -0700
          Re: Using consumer-grade power amp as Power opamp George Herold <gherold@teachspin.com> - 2017-05-16 11:32 -0700
            Re: Using consumer-grade power amp as Power opamp Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-05-16 16:02 -0400
              Re: Using consumer-grade power amp as Power opamp John Larkin <jjlarkin@highlandtechnology.com> - 2017-05-16 20:19 -0700
  Re: Using consumer-grade power amp as Power opamp Phil Allison <pallison49@gmail.com> - 2017-05-15 16:59 -0700
    Re: Using consumer-grade power amp as Power opamp Chris Jones <lugnut808@spam.yahoo.com> - 2017-05-16 21:54 +1000
      Re: Using consumer-grade power amp as Power opamp Phil Allison <pallison49@gmail.com> - 2017-05-16 06:06 -0700
      Re: Using consumer-grade power amp as Power opamp tabbypurr@gmail.com - 2017-05-16 06:57 -0700
  Re: Using consumer-grade power amp as Power opamp Winfield Hill <hill@rowland.harvard.edu> - 2017-05-15 18:42 -0700
    Re: Using consumer-grade power amp as Power opamp krw@notreal.com - 2017-05-15 21:55 -0400
      Re: Using consumer-grade power amp as Power opamp Winfield Hill <hill@rowland.harvard.edu> - 2017-05-16 05:53 -0700
        Re: Using consumer-grade power amp as Power opamp Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-16 14:23 +0000
        Re: Using consumer-grade power amp as Power opamp krw@notreal.com - 2017-05-16 12:28 -0400
    Re: Using consumer-grade power amp as Power opamp "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> - 2017-05-16 20:27 +0100
      Re: Using consumer-grade power amp as Power opamp Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-16 16:03 -0700
        Re: Using consumer-grade power amp as Power opamp "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> - 2017-05-17 19:34 +0100
          Re: Using consumer-grade power amp as Power opamp Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-17 11:47 -0700
          Re: Using consumer-grade power amp as Power opamp Phil Allison <pallison49@gmail.com> - 2017-05-18 04:43 -0700
        Re: Using consumer-grade power amp as Power opamp Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-18 16:30 +0000
      Re: Using consumer-grade power amp as Power opamp John Larkin <jjlarkin@highland_snip_technology.com> - 2017-05-16 16:07 -0700
  Re: Using consumer-grade power amp as Power opamp jurb6006@gmail.com - 2017-05-16 00:45 -0700
  Re: Using consumer-grade power amp as Power opamp sroberts6328@gmail.com - 2017-05-18 08:57 -0700
    Re: Using consumer-grade power amp as Power opamp George Herold <gherold@teachspin.com> - 2017-05-19 06:29 -0700

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