Question on OPA549 / OPA541 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th April 2006, 04:14 AM   #1
methar is offline methar  Thailand
diyAudio Member
 
Join Date: May 2005
Location: BKK
Default Question on OPA549 / OPA541

I searched old threads but still cannot exactly find the answers to the question belows.

1). As the max continous current of an OPA549 is 10A, do we really need 10A transformer for each of them? If not, what is recommended Amphere the transfer should be (for mono)?

2). For one 18-0-18V (300VA) for stereo at gain x10 gainclone, which one of OPA549 or OPA541 should be used?

3). How much Watts will we get from OPA549 with +/-25Vdc ?

4). For subwoofer (gain x22), should we go for OPA549 (+/- 25Vdc), or OPA541 "AP" (+/-34Vdc) ?

5). For subwoofer, how the parallel two of LM3875 (+/-35V) goes compare with OPA541/549 as I already have LM chips on hand?

Million thanks!
  Reply With Quote
Old 3rd July 2006, 08:51 PM   #2
DACMan1 is offline DACMan1  South Africa
diyAudio Member
 
Join Date: Jun 2006
1) No. These chips will anyway only do about 4 amp continuous and they really start doing funny stuff when you ask them do dissipate more than 40W, regardless of hetsink temp. For mono, about 80VA transformer would be mor than enough.

2) These are not as powerful as TI clams!! So go for the 549.

3. If you're optimistic, these will drop about 3V off your rail, so thats 25-3=22. 22^2/(2*8)=30Wrms into 8 ohm.

4) Maybe puttin about 5 of the 541 in parallel could be acceptable.

5) If you already have LM3875 amplifiers, don't waste time on these burrbrown op-amps! I've used them quite a bit, their always a let down.
  Reply With Quote
Old 4th July 2006, 04:21 PM   #3
diyAudio Member
 
Join Date: Mar 2003
Location: Windsor
I agree completely with DACMan1, although the TI chips can sound good, they just don't have the output of the LM series. I would equate the OPA549 to an LM1875. I had some very nice boards I threw together with 4 OPA549 in bridge parallel, that I was planning on using as a sub amp...in the end it just didn't have the output I needed.

G.
__________________
If you take something apart and put it back together again enough times, eventually you will have two of them.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
OPA541 Question valo Chip Amps 0 14th January 2009 09:33 PM
OPA541 gain question??? 5150ed Chip Amps 2 25th July 2006 03:35 PM
Opa549 & Opa541 kinser Chip Amps 4 18th January 2005 09:43 AM
How to use OPA549 and OPA541? JojoD818 Chip Amps 50 15th November 2003 02:01 PM
OPA541 and OPA549 Mad_K Chip Amps 27 9th July 2003 03:22 PM


New To Site? Need Help?

All times are GMT. The time now is 11:38 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2