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Old 23rd January 2003, 12:11 PM   #1
Bricolo is offline Bricolo  France
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Default Good single rail opamps

I'm looking for another opamp to replace the philips TDA1308A I've fired on my soundcard (this is a headphone amp, but don't bother. It's fos a line output, not for headphones)

and the opamp is only powered with 0 and +5V, wich good opamps can I use for this?

so low voltage+single rail.



PS: can I use any +- rails opamp with single rail, and set +V to 1/2 Vcc and add a 1/2Vcc offset to the -V signal? (and off course, an output cap)
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Old 23rd January 2003, 12:27 PM   #2
halojoy is offline halojoy  Sweden
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Default Re: Good single rail opamps

Quote:
Originally posted by Bricolo
I'm looking for another opamp to replace the philips TDA1308A I've fired on my soundcard (this is a headphone amp, but don't bother. It's fos a line output, not for headphones)

and the opamp is only powered with 0 and +5V, wich good opamps can I use for this?

so low voltage+single rail.

PS: can I use any +- rails opamp with single rail, and set +V to 1/2 Vcc and add a 1/2Vcc offset to the -V signal? (and off course, an output cap)
This should be a rail-to-rail OP
with good current output drive.

There are crertainly a lot of them around, modern.

Perhaps one of them video 50ohms line drivers.

See each OP amp manufacturers Selection guide
for example Linear Technology
or Burr-Brown
or National Semiconductors
or Philips
or Analog Devices

LT - Linear Technology OP amp Selector Guide

National Analog Amplifiers

halo - no problems the alternatives are out there! in modern shape ...
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Old 23rd January 2003, 12:38 PM   #3
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Default TI's selector guide is now online

in the past couple days TI just put their op-amp selector up as a 40+ page PDF -- also -- TI is now making knock-offs of some of the Linear chips, by the way. I just got in some LT1013's TI parts and they work identically as compared with the Linear Tech LT1013's.

www.analog.com www.linear.com www.ti.com

Not necessarily a good idea to just split the rail -- without careful attention to detail you will have the signal propogating itself back into the power supply., or the noise of the power supply propogating itself into the amplifier.
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Old 23rd January 2003, 08:31 PM   #4
Bricolo is offline Bricolo  France
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I know those websites


but does womeone know a good sounding single rail opamp?
One that is known to sound good
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Old 23rd January 2003, 08:35 PM   #5
halojoy is offline halojoy  Sweden
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Quote:
Originally posted by Bricolo
I know those websites

but does womeone know a good sounding single rail opamp?
One that is known to sound good
My OPamps doesn't make a sound - dead quiet.
If they did make sounds - I'd be totally crazy.

I do not like Cables, that makes sounds either,
hope I never meet any of those.......

My music make sound from the speakers.

/halo - probably an exception
- having dead quiet components - as far as his ears go
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Old 23rd January 2003, 08:40 PM   #6
Bricolo is offline Bricolo  France
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Quote:
Originally posted by halojoy

My OPamps doesn't make a sound - dead quiet.
If they did make sounds - I'd be totally crazy.

try to put your ear closer to your opamp
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Old 23rd January 2003, 08:55 PM   #7
halojoy is offline halojoy  Sweden
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Talking He He - that was a good JOKE! Bricolo

Quote:
Originally posted by Bricolo
try to put your ear closer to your opamp
You make me laugh

Well, I guess I have to try,
put my OPamp inside my ear .......

I can use some wires to supply the power
to my ear

/halo - will test his OP amps - in the modern way
- by listening tests
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Old 23rd January 2003, 08:59 PM   #8
Bricolo is offline Bricolo  France
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Default Re: He He - that was a good JOKE! Bricolo

Quote:
Originally posted by halojoy

You make me laugh

Well, I guess I have to try,
put my OPamp inside my ear .......

I can use some wires to supply the power
to my ear

/halo - will test his OP amps - in the modern way
- by listening tests
new project: an opamp with an exponential horn
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Old 23rd January 2003, 09:05 PM   #9
halojoy is offline halojoy  Sweden
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Question Who need Tweeters & Woofers

Quote:
Originally posted by Bricolo
new project: an opamp with an exponential horn
Yes, of course!
Who need Woofers & Tweeters
when we have OP-amps that sounds (good)

Just make a good horn to get some
well-sounding
- OP-Speakers -

We can find out the T/S parameters by tests
by running tests on the different OP-amps
What would be the VAS of an OPA2134??


/halo - the new age in Audio is here !!!!!!!
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Old 23rd January 2003, 09:11 PM   #10
Nicke is offline Nicke  Sweden
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Default Good opamp

You could try the AD823 if you need a double opamp.
Not bad IMHO.....

Nicke
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