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-   -   Opa549 (http://www.diyaudio.com/forums/chip-amps/5318-opa549.html)

ANTHONY2181 19th August 2002 02:23 AM

Opa549
 
Hi has any one experimented with the opa549 power op amp from Burr Brown?

Cheers

Anthony

JAZZ2250 13th February 2003 06:07 PM

interesting
 
I'm also interested in this op-amp. I'm thinking to use it for a subwoofer amplifier. According to the specification, this guy can draw whole lotta current, much more than LM3875 which is the famous op-amp for gainclone, can. It seems to be an interesting experiment to play with this little guy. Anybody tried this op-amp?

till 13th February 2003 06:16 PM

I made a very simple amp with OPA549. Inverting opamp v=20 +-30V.

BB has the advantage they sent me samples. National seems not to like me. I ordered LM3875 etc. 3 month ago, national website says order in process since then - nothing arrived.

JAZZ2250 13th February 2003 06:22 PM

Hmmm... I haven't had any problem with sample program with National. Though I prefer TI simply because I'm in Austin, TX. The samples from TI are delivered usually in 1-2 days after the request which is COOOOL. :-)
BTW, how does your OPA549 based amp sound compared with other audio gears you have? I'm much interested in building a subwoofer amp using this guy.

pinkmouse 13th February 2003 06:24 PM

Hi

I am currently playing with a couple of OPA549 in inverted mode, and I have to say, despite constructional difficulties caused by me buying surface mount rather than staggered pin versions, they sound pretty sweet.

They are not quite as open and extended on the very top as the LM3875 chips, but that could be just due to components or layout, more experimentation is needed.

I am also running into problems with thermal shutdown, but I think this is because I am running them on a 30-0-30 dc supply which is right on the limit for these chips.:devilr:

till 13th February 2003 06:30 PM

yeah, and whats very cool is, for germany they need only one or two days also!

Go with it for the subwoofer, will be ok.
I will try out OPA544 next. I donīt really need the power. Very cool are those high voltage high current OP amps in TO3 with 8 pins - only i donīt know how to mount them on a heatsink - if i drill than many holes there is not much heatsink left for thermal contact.

mlloyd1 13th February 2003 06:31 PM

Maybe they sold them all the current stock to companies that are putting them in Rear Projection TVs ? :)

mlloyd1

Quote:

Originally posted by till
.... National seems not to like me. I ordered LM3875 etc. 3 month ago, national website says order in process since then - nothing arrived.

carlmart 13th February 2003 07:36 PM

Samples
 
Quote:

Originally posted by till


BB has the advantage they sent me samples. National seems not to like me. I ordered LM3875 etc. 3 month ago, national website says order in process since then - nothing arrived.

National seems to have cut sending samples outside of the USA. I don't get them in Brazil anymore and a friend told me in Argentina neither. Apparently Europe is too.

BB and ADI keep delivering.

Pity BB does not include their OPA512 in their sample program, which is TO3 and goes up to +/-50v, probably delivering close to 100W. Looks like an LM12 version.


Carlos

JAZZ2250 13th February 2003 07:58 PM

pcb
 
Thanks for the replies. ;) I'll go with OPA549, which I already have, for the subwoofer project.
BTW, is there any pcb for 2-way active crossover available online? I posted a question about pcb, but I couldn't get any answer. I hope I can this time. ;) I know it's not very complicated, and point-to-point wiring is okay with it. But, I might need to build couple of it.

till 13th February 2003 08:05 PM

hehe, howe may people are waiting for the high/low pass?

http://www.passdiy.com/preamps.htm


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