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Old 18th November 2003, 09:54 AM   #1
krishu is offline krishu  Europe
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Default Power Opamp Chips in Commercial Products

Hello to everybody,

I am not sure if this has been discussed before, but I would like to get a "complete list" of opamp chips used in commercial products. Maybe this can be good for evaluation of typical sound of a chip. And for getting material cheaply (by fleecing old equipment). Or for knowing what money a DIYer saved or what time he wasted ...

In Germany, the TDA7293 is very popular in commercial DIY products (single and triple parallel):
> UB-elektronic HiAmp100 www.ub-elektronik.de
(single, schematics, pcb available)
> Elektor Magazine (single)
> Newtronics Amp 7293 www.newtronics.de (triple)
> Hoer-wege Amp1 www.hoer-wege.de (triple)

All of those use large torodial transformers and large filter capacities.

LM3886
> ELV www.elv.de (single, standard circuit, electrolytics in signal path ...) Really cheap (25 Euros for DIYers parts and pcb excluding PS)

It is known that Linn uses three TDA7293 in their 2250 power amp (but not in the Klimax).
nORh (right spelling) uses one TDA7293 in their Le Amp

The Gaincard as the father of the Gainclones uses one LM3975(?)

Then there are numerous subwoofer amps using TDA7293 etc.;

Does anybody know of cheap or expensive products using these chips? (Like certain car power amps, active computer speakers, esotheric high-end gear...)

Looking forward to a large list ...

Cheers
Christian.
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Old 18th November 2003, 11:12 AM   #2
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Default OPA541AM

This seems a nice thread to post a question about the OPA541AM.

Which commercial amplifier uses this (US$ 80 / each) power opamp? The price must be in the "High End" range (take 2 units = US$ 160,00, multiply by 5, a common factor used by commercial manufacturers, and you get US$ 800,00 just in the opamp´s...)
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Old 18th November 2003, 11:41 AM   #3
matjans is offline matjans  Netherlands
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hi,

Somewhere on this forum I read that National manufactured a special 5-pin package of the lm3875 for Sony but I have no clue in which system(s) they use it.

tried searching for it but it gave too many results...
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Old 18th November 2003, 12:10 PM   #4
krishu is offline krishu  Europe
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The OPA541 in plastic package is about $10 ...

Cheers
Christian.
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Old 18th November 2003, 01:09 PM   #5
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the Linn Majik uses a chip-amp --
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Old 18th November 2003, 03:33 PM   #6
AndersZ is offline AndersZ  Sweden
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Rowland uses lm3886 in their concentra II for example. At 6500$ and raving reviews I think it classifies as high-end

Anders
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Old 18th November 2003, 03:56 PM   #7
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by matjans
hi,

Somewhere on this forum I read that National manufactured a special 5-pin package of the lm3875 for Sony but I have no clue in which system(s) they use it.

tried searching for it but it gave too many results...
National sells them basically anyway you want it seems but it is very hard to find when looking at the specific part. An example would be LM3886 LB14 which is the LM3886 but flat mount.

http://www.national.com/ms/TO/TO_220...ND_OPTIONS.pdf
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Old 18th November 2003, 08:17 PM   #8
vuki is offline vuki  Croatia
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Linn Klimax Twin uses TDA7293's, Linn Komri uses TDA7293's to power subwoofers, Audio Physic Kronos uses some LM's to power subwoofers...
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Old 18th November 2003, 10:38 PM   #9
spind is offline spind  Canada
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I bought my daughter a Marshall 2x15W (MG215RCD??) guitar amp that has 2 LM1875T's in it.

Steve.
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Old 19th November 2003, 02:22 AM   #10
ir is offline ir  New Zealand
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yeah my fender amp has something similar (way more power tho), inspired me to try the same using bridged 3875's
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