Surround Amplifier - 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 10th July 2004, 12:17 PM   #1
diyAudio Member
 
Join Date: Sep 2003
Location: Illinois
Default Surround Amplifier

I have always wanted to build a 5-channel surround amp. Now I think I'm ready to finally start. But, I need some reccomendations on what chip to use. I want close to 200W per channel so it has plenty of power to keep up with the explosions in movies. The front needs to be able to drive 2 ohm speakers and the center and rear are 8 ohm. I was originally thinking of using the bridged OPA549 PCB design I already have. But, to drive a 2 ohm it would need 3 of those bridged boards paralleled together. So 6 boards for the front and 3 for the rest. That's 12 chips in the front and 6 in the back or 18 chips total. I would like to use less than that if possible.

What chip is simple enough to use and to make the boards for them myself, yet also provides enough power and is able to drive demanding speakers? Should I just go with the opa549 and make that many boards?
  Reply With Quote
Old 10th July 2004, 12:51 PM   #2
diyAudio Member
 
Join Date: May 2004
Location: Atlanta Georgia Area
Default rough load.....

IMHO, 2 ohm loads are a tall order.

If it were me, I would reconfiguring the front 2 speakers say for at least 4 ohms. This would save you a lot of chips and troubles.

Honestly i've never made a chip amp (yet), but from what I have read here on the forums. A 2 ohm reactive load would possibly make the protection circuitry on the chips kick in once they got good and hot, as the load can go much lower than nominal.

I am just getting into this again after 15 years so consider this a newbie opinion at best.

Good luck to you.
  Reply With Quote
Old 17th July 2004, 02:44 AM   #3
diyAudio Member
 
Join Date: Sep 2003
Location: Illinois
is anybody here?

please recommend a good chipamp for this task.
  Reply With Quote
Old 17th July 2004, 06:10 AM   #4
mrrao is offline mrrao  China
diyAudio Member
 
Join Date: Jul 2004
Location: shenzhen city
use transistor .
  Reply With Quote
Old 17th July 2004, 01:25 PM   #5
diyAudio Member
 
Join Date: Sep 2003
Location: Illinois
too complicated...

Well, actually, is it possible to use a single high power transistor? I have some On Semiconductor MJ15003 and MJ15004 High Power Transistors. How much power can I get using those? And, how would I use them?
  Reply With Quote
Old 19th July 2004, 02:31 AM   #6
mrrao is offline mrrao  China
diyAudio Member
 
Join Date: Jul 2004
Location: shenzhen city
yes very complicated.
because high voltage.
abvert smoke out.
  Reply With Quote
Old 19th July 2004, 02:27 PM   #7
B.I.G is offline B.I.G  Romania
diyAudio Member
 
Join Date: Mar 2004
Location: Home
HIGH VOLTAGE ====> HIGH POWER

YOU can get about 150W/4ohm with one pair of mj15003/4
__________________
B.I.G
  Reply With Quote
Old 19th July 2004, 02:30 PM   #8
tiroth is offline tiroth  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
Really? I thought that was way outside SOA for a single pair.
  Reply With Quote
Old 20th July 2004, 02:02 AM   #9
diyAudio Member
 
Join Date: Sep 2003
Location: Illinois
could that pair of those transistors drive 2ohm, even 1ohm?

Would somebody mind helping me build this by designing a schematic?
  Reply With Quote
Old 22nd July 2004, 01:25 AM   #10
diyAudio Member
 
Join Date: Sep 2003
Location: Illinois
anybody??
  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
axial surround instead of radial surround Calvin Subwoofers 22 13th July 2009 06:46 PM
surround amplifier jalejos Class D 11 7th January 2009 04:36 PM
Surround Decoder - Subtract amplifier mod_evil Tubes / Valves 24 8th July 2006 07:41 PM
Pioneer VSX - D710S-G Surround Amplifier 4 Sale NicolasGaal Swap Meet 2 1st January 2004 06:40 AM
For those of us with $$$, DIY surround Tieftoener Digital Source 0 20th November 2003 06:06 PM


New To Site? Need Help?

All times are GMT. The time now is 12:16 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