OPA549 disappointing - Page 2

theChris · 30th August 2004, 04:12 PM

you'd have to power the opa549 and 637 off of equal rails. the opa637 is limited to +-18V, while the opa549 can go much higher.

Mad_K · 30th August 2004, 04:29 PM

OPA604 @6-12dB gain and OPA549 @20dB is a shure shot! you could even power both of +/-24V... (I would use regs to +/-15V on the OPA604 though)

JojoD818 · 30th August 2004, 04:52 PM

I have both LM3875 and OPA549 in non-inverting configuration playing right now. Frankly, I like both of them very much.

Maybe the 549 is comparable to a 741 like Franz G said but still, I like how it plays music.

Just me.

carlosfm · 30th August 2004, 06:19 PM

Quote:

Originally posted by theChris
you'd have to power the opa549 and 637 off of equal rails. the opa637 is limited to +-18V, while the opa549 can go much higher.

You're right.
OPA552 seams perfect for this job.

Check it out.

JojoD818 · 31st August 2004, 06:10 AM

Quote:

Originally posted by carlosfm
Here's a good opportunity to make something different.
OPA549 as a buffer, with a gain stage before it.
OPA637 biased into class-A?

Carlos,

This is very interesting, an opa637 with a gain of 20-22? Then a 549 in unity gain... is it possible?

JojoD

carlosfm · 31st August 2004, 10:03 AM

Yes, but you can't go higher than +/-18v PSU voltage.
Other op-amps can handle more.

JojoD818 · 31st August 2004, 04:28 PM

Quote:

Originally posted by carlosfm
Yes, but you can't go higher than +/-18v PSU voltage.
Other op-amps can handle more.

How about +/-18v for the 637 and +/-25v for the 549?

I think I'll try this.

carlosfm · 31st August 2004, 04:54 PM

Jojo, why don't you read this thread from the beginning?
You are making questions that have been answered here.
This thread is only 2 pages, read it.

JojoD818 · 1st September 2004, 02:56 AM

Quote:

Originally posted by carlosfm
Jojo, why don't you read this thread from the beginning?
You are making questions that have been answered here.
This thread is only 2 pages, read it.

Carlos,

I was reading it since the beginning of the thread. I was just confirming it though. So sorry if I disturbed you.

Thank you,
JojoD

ybserge · 21st February 2006, 09:34 PM

Quote:

Originally posted by Mad_K
OPA549 should not be used with gain higher than 10x in audio applications

Not absolutely. It works fine at 19 when combined with a tone circuit preamp. I did what I found from here http://yooree.narod.ru/tale_3.chm - nice staff. Unfortunately eveything is in Russian.

30th August 2004, 04:12 PM	#11
theChris diyAudio Member Join Date: Dec 2001 Location: SIUE, Illinois, USA	you'd have to power the opa549 and 637 off of equal rails. the opa637 is limited to +-18V, while the opa549 can go much higher. __________________ if only it could be used for good, not evil...

30th August 2004, 04:29 PM	#12
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	OPA604 @6-12dB gain and OPA549 @20dB is a shure shot! you could even power both of +/-24V... (I would use regs to +/-15V on the OPA604 though) __________________ Mads K

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30th August 2004, 04:52 PM	#13
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: diyAudio Special Operations Center	I have both LM3875 and OPA549 in non-inverting configuration playing right now. Frankly, I like both of them very much. Maybe the 549 is comparable to a 741 like Franz G said but still, I like how it plays music. Just me.

31st August 2004, 10:03 AM	#16
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	Yes, but you can't go higher than +/-18v PSU voltage. Other op-amps can handle more.

31st August 2004, 04:54 PM	#18
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	Jojo, why don't you read this thread from the beginning? You are making questions that have been answered here. This thread is only 2 pages, read it.

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