6watts RMS output from any gen purpose OPAMPs? and still cheap? - diyAudio
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Old 18th August 2012, 10:02 PM   #1
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Default 6watts RMS output from any gen purpose OPAMPs? and still cheap?

I want to drive 2 inch full range speaker with 8 ohms 10 watts for pc audio application. Is there any general purpose OPAMP which can do the job instead of going to a power amp. When i disect a Altec lansing speakers I see opamps instead of power amps. Can anybody suggest some good quality opamps does the job? can you please suggest few for this purpose...
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Old 18th August 2012, 10:09 PM   #2
jcx is offline jcx  United States
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for a linear Class AB amp the best you can do is 70% efficiency - so you need to get rid of at least 3 W per channel - really requires a package designed for heat removal, added heat sink or lots of area of heavy Cu PCB plane attached to special heat conducting features on the chip

Class D switching chips can manage with less heatsinking due to higher effeicieny - can be over 90%

Last edited by jcx; 18th August 2012 at 10:12 PM.
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Old 18th August 2012, 10:19 PM   #3
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anyway ill add the heatsink for it but some say that opa2134 should do the job but I think its output current is just 35mA so thought if some other opamps should do the job..
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Old 18th August 2012, 10:39 PM   #4
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You want a chipamp, not an op-amp. Countless options here.
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Old 18th August 2012, 10:56 PM   #5
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but i see most of the 2 channel desktop pc speakers using opamps instead of chipamps... they are driven with single supply 12v and 1 amp adapter. I havent completely break the altechlansing 2.1 speaker but I could see two 16 pin DIP opamps there but there is a small heatsink plates kept on top of it and i ve touched it they get slightly hot while playing at full volume...
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Old 18th August 2012, 11:18 PM   #6
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You'll probably find it's actually something like this rather than an opamp, unless there are some power transistors hidden somewhere (a couple full bridges worth would be hard to miss):

TEA2025B STMicroelectronics | 497-3991-5-ND | DigiKey

Last edited by Andrew Eckhardt; 18th August 2012 at 11:24 PM.
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Old 19th August 2012, 03:58 AM   #7
DUG is offline DUG  Canada
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If these are like the ones you mentioned with an "op-amp" then I have some information on the ones that I have and took a look inside.

They were listed on the box as 180W pmpo (don't get me started on that discussion)

I looked up the DIP amp in them and found a 1W (total RMS power) @10% distortion amp.

They are what they are: $9 cheapos

I use them at work, keep away from the 10% distortion levels and they work fine. Certainly good enough for cheap headphones.
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Old 19th August 2012, 03:59 AM   #8
DUG is offline DUG  Canada
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forgot pix
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Old 19th August 2012, 11:49 AM   #9
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how about AD815 as power amp for the 2 inch speakers?
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Old 19th August 2012, 01:34 PM   #10
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Why are you insisting on an op-amp? There are countless chipamps better suited for this....

AN7135-CM
AN17820B
AN5275
TDA7266SA
TDA7365
TDA7297
TDA7266
STA540SAN
TPA1517NE
AN17808B
AN5276
TDA7297SA
TDA7263
TDA2009A
LA42102-E
TDA7372A
LA4450-E
LA4625-E
TFA9843AJ/N1,112
TDA8946AJ/N2,112
TDA8944AJ/N2,112
AN5277
AN7125
TDA7057AQ/N2,112
TFA9842BJ/N1,112
TFA9843BJ/N1,112
TDA8946J/N1,112
TDA8944J/N1,112
TFA9800J/N1,112
TFA9842AJ/N1,112
LM4752T/NOPB
LM4755T/NOPB
TDA2007A
TA8216HQ(5)
TA8246AHQ(5)
TDA7263M
TDA7372B
TDA7499

.... just to name a few.
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