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 March 2007, 12:12 AM   #1
diyAudio Member
 
Join Date: Feb 2007
Location: Argentina
Default 100W+ amp needed desperatly!

Ok i've tried to build a tda7294 based amp using 2 different pcb's and all i got is to burn 3 of these IC's. I need a 100W amp which uses a 60+60V PSU and FAST! Anyone have schematic/pcb for this?

PD: I can't use stk amps cause i can't get them here!
  Reply With Quote
Old 9th March 2007, 12:23 AM   #2
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
The maximum voltage for tda7294 is +-50V maybe that why they burn up?
  Reply With Quote
Old 9th March 2007, 12:49 AM   #3
diyAudio Member
 
Join Date: Feb 2007
Location: Argentina
oops! for some reason i was sure mas voltage for it was 70v!! i don't know why i thought that? now i feel really stupid. Ok still, is there any amp which can stand 70 + 70v or so?
  Reply With Quote
Old 9th March 2007, 01:03 AM   #4
lukio is offline lukio  Indonesia
diyAudio Member
 
Join Date: Dec 2003
Location: Bandung, Indonesia
Hi Hernanstafe,,

You probably should find high rail voltage amp in solid state main thread for that kind of amp you looking for. I never heard chip amp that can withstand rail voltage that high..



cheers,,

lukio.
  Reply With Quote
Old 9th March 2007, 01:04 AM   #5
Elkaid is offline Elkaid  Canada
diyAudio Member
 
Elkaid's Avatar
 
Join Date: Jan 2003
Location: Canada
Send a message via MSN to Elkaid
Quote:
Ok i've tried to build a tda7294 based amp using 2 different pcb's and all i got is to burn 3 of these IC's. I need a 100W amp which uses a 60+60V PSU
In fact, the TDA7294 is +/-50V when no signal is applied. It's +/-40V Max when signal is applied.

Last time I played with TDA7294, I had to unwind my 30+30V toroidal transformer because once rectified/filtered, the supply was too high and the chips were blowing up.

TDA7294 has a little brother with slightly higher specifications. The TDA7293 can go up to +/-50V with signal applied.
According to the datasheet, you'll get 100W for a 8ohm load with a 10%THD. I would go for 80 Watts instead in order to keep THD value at an acceptable level.


If you absolutely need 100W+, maybe you should consider for bridged/parallel LM3886 amplifier. National semiconductor has a whitepaper describing it.
AN192

However, even the amplifiers described in the application note cannot withstand +/-60V
  Reply With Quote
Old 9th March 2007, 01:05 AM   #6
diyAudio Member
 
Join Date: Feb 2007
Location: Argentina
well the stk4241 does for example it can handle up to 80V actually, but it's stereo and i need a mono one, plus it's very very expensive
  Reply With Quote
Old 9th March 2007, 01:23 AM   #7
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
Why Not just drop the +/-60v Idea and Build PSU of more reasonable Voltages to run a Chip amp?? Or maybe you can Mod your PSU to put out lower Voltages....

If you don"t want to drop the +/-60v idea then you will most likely have to drop the Chip amp Idea and go for a Discrete Solid state amp useing BJT"s or Mosfets which should allow for a +/-60v PSU.....

It is sad But True.....



  Reply With Quote
Old 9th March 2007, 01:29 AM   #8
diyAudio Member
 
Join Date: Feb 2007
Location: Argentina
well i'm trying to find a solid state amp, i seriously don't care about the amp type (chip, solid state, etc) i just want it to work properly. The PSU is made using a 110V transformer, with a "fake" ground rectifier to have about 70 +70v...i wonder if i can like downgrade the voltage to 50+50? i can think of resistors but they'll be HUGE! I don't have any other transformers to do a better psu around, so i have to fix the problem with that one
  Reply With Quote
Old 9th March 2007, 07:16 AM   #9
diyAudio Member
 
Join Date: Feb 2007
Location: Naples, Florida
Send a message via MSN to stahlight
Default APEX PA04?

Sir,

May I suggest a... monster

http://eportal.apexmicrotech.com/mai..._amps/pa04.asp

The Apex Microtechnology PA04. It's a hybrid chip, and it packs a punch. Audio up to 400W RMS. Also check out their other amplifiers.

I have used them before, excellent amplifiers. A word of warning: they are EXPENSIVE!

Hope this can help you!
__________________
--
"Success is not a destination; it's a journey."
  Reply With Quote
Old 17th August 2007, 05:56 PM   #10
NUKE89 is offline NUKE89  Greece
diyAudio Member
 
Join Date: Aug 2007
Where can we buy those hybrid ics you say from internet?I cant find them here in greece.

And how much do they cost?
__________________
me
  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
Simple, powerful (100W-200W into 8ohm) amplifier schematic needed ddog Solid State 15 11th July 2013 11:04 AM
Desperatly need Sony D-11 parts! Zero Cool Digital Source 1 2nd April 2007 05:26 PM
Desperatly seeking Mitsumi D37 Connectors! Zero Cool Swap Meet 1 1st October 2006 07:54 PM
Evolve Amps 100W+100W Stuff 4 Sale WALTER BURKHARD Swap Meet 4 8th June 2005 10:57 AM
Desperatly Need schematic for Pioneer A-77X bigerik Solid State 2 8th March 2005 12:15 AM


New To Site? Need Help?

All times are GMT. The time now is 07:16 AM.


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