OPA541AP Subwoofer amp - 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 27th November 2003, 02:56 PM   #1
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Default OPA541AP Subwoofer amp

Hi!

Can someone help me to build a subwoofer amp with the OPA541 chip. If it is supposed to be 4ohm stable, do I need to do a parallell setup, or maybe a bridged parallell?

How many watts will it then push out?

Anyone got schematics for these setups with the OPA541?

OPA541 or OPA549 for a sub amp? (or another IC is better?)

Thanks for any answers!
  Reply With Quote
Old 28th November 2003, 05:52 PM   #2
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Can someone help?

Anyone who have parallelled the OPA541?

How many watts can it give into 4ohm?
  Reply With Quote
Old 29th November 2003, 02:20 PM   #3
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
build something like this.
you can use the opa541am/ap, just put a link from after Rout on each chip back to pin 1/8 on the opa541am/ap. it will give you 200W in 4 ohms

http://www.national.com/an/AN/AN-1192.pdf

edit: you can also use lm3875/3886/opa549
Attached Images
File Type: jpg pa100.jpg (63.4 KB, 1113 views)
__________________
Mads K
  Reply With Quote
Old 29th November 2003, 04:04 PM   #4
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Thank you for the answer

Is it really this simple? No other parts, except those in the power supply?

How can I figure out what trafo to use when it's used on a 4 ohm subwoofer? What secondary voltages, and what VA rating is needed?

I plan on buying ToroidTM trafo, I see you use them Mad_K, are they any good?
  Reply With Quote
Old 29th November 2003, 11:41 PM   #5
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
yes it's that simple

buy the 600VA 2*24VAC one (elfa nr 56-139-30). they are very good. you have to use a softstart circuit with a trafo of this size.

a pair of rifa peh200 will also be nice (for example elfa nr 67-661-33)
__________________
Mads K
  Reply With Quote
Old 30th November 2003, 03:56 PM   #6
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Isn't 600VA a bit overkill? (and budget killer )

How do I build a softstart circuit?

When you say 200W, do you mean peak or RMS?

Thanks for helping
  Reply With Quote
Old 30th November 2003, 04:24 PM   #7
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Sorry for all the stupid questions, but here's another one:

Is the power supply on the link under good for my project? (With the two Rifas near the chips).

http://www.euronet.nl/~mgw/diy/amps/...ply_schema.gif

Anyone got a schematic for a powersupply to recommend?
  Reply With Quote
Old 30th November 2003, 07:29 PM   #8
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
skip the 0,1uF caps, use regular high-powered bridge rectifier (~25A) and use the peh200 instead of c1/2. on a second thought -use the 0,1uF caps directly on the chip between v+/v- and gnd.


here's some light reading: http://www.tnt-audio.com/clinica/ssps1_e.html
__________________
Mads K
  Reply With Quote
Old 1st December 2003, 11:27 AM   #9
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Thanks for that link!

Answered all my questions concerning power supplies.
  Reply With Quote
Old 2nd December 2003, 02:36 PM   #10
diyAudio Moderator
 
JojoD818's Avatar
 
Join Date: Mar 2003
Location: searching...
Quote:
you can use the opa541am/ap, just put a link from after Rout on each chip back to pin 1/8 on the opa541am/ap. it will give you 200W in 4 ohms
does that mean that the pin 8 of the 2 541s in a parallel mode are tied together?

Thanks,
JojoD
  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
One of my OPA541AP short without knowing why 5150ed Chip Amps 2 22nd September 2006 02:50 PM
WTB: 2x OPA541AP j4cbo Swap Meet 8 19th September 2006 12:45 AM
Invert OPA541AP schematic 5150ed Chip Amps 0 13th June 2006 09:22 AM
Subwoofer crossover / subwoofer module design derMichi Subwoofers 4 20th April 2006 10:31 AM
how to connect a non powered subwoofer to a stereo system without a subwoofer output JSD777 Multi-Way 4 20th September 2005 03:19 PM


New To Site? Need Help?

All times are GMT. The time now is 10:21 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