TDA8947J output power@12 volt supply - Page 2 - 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 7th September 2011, 05:51 AM   #11
diyAudio Member
 
Join Date: Dec 2008
Location: bangalore
To Andrew T & Johnr66
if it is so then why people are interested in so powerful car ams(called as 1000watts)?
I india i have seen many local made car stereos(inside is sanyo old la4440) and for my ears it gives very powerful sound.
  Reply With Quote
Old 7th September 2011, 11:55 AM   #12
johnr66 is offline johnr66  United States
diyAudio Member
 
Join Date: Mar 2009
Quote:
Originally Posted by sudhir kumar View Post
To Andrew T & Johnr66
if it is so then why people are interested in so powerful car ams(called as 1000watts)?
I india i have seen many local made car stereos(inside is sanyo old la4440) and for my ears it gives very powerful sound.
More watts is more SPL. 1000 watts is ~18db more than 15 watts. Of course it's likely the amp can't produce anything near 1000 watts, but is probably more powerful than a 15 watt BTL chip.

17 years ago, I built a 2 channel amp with a couple BTL chips to drive a DVC 12" driver in a ported box. Clean power would have been about 27 watts. It was plenty adequate for the job.
  Reply With Quote
Old 7th September 2011, 05:25 PM   #13
diyAudio Member
 
Join Date: May 2008
Quote:
Originally Posted by sudhir kumar View Post
why people are interested in so powerful car ams(called as 1000watts)?
Depends on the people. Some want so much power, because they believe the salespeople that tell them it's the way to go.

Others want 1000 Watts to impress their friends, without the slightest idea what the difference is between a 10 W amp and a 100 W other than the figure. Those are the usual victims that buy 2x17 Wrms amps for 20 Euros and believe the 2x1000 W PMPO print on the case is a proof of superior quality.

A few people that compete in sound-offs, need that much power to achieve 130dB+ of clean output from 20 Hz to 20 kHz to be able to win SPL competitions.

From a technical point of view you "need" that much power to drive extreme-long-throw woofers with 150 g or more of moving mass, built into too small enclosures, and playing music with significant content below 50 Hz at ear-shattering level. You may also need that amount of power, if you are a fan of big church organs and wish to listen to their lowest notes at live levels in your home.

90 % of all listeners will find that somewhere between 10 and 50 W they have all the power they ever need for home audio. A few difficult speakers may ask for more, but then it is worth considering different speakers rather than more powerful amps.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 29th September 2011, 11:13 AM   #14
diyAudio Member
 
Join Date: Dec 2008
Location: bangalore
I have read in the foroum that TDA1554 is better than old LA4440 but both datasheet tell that @10%THD.If the THD figure is same why one chip is better than other?
  Reply With Quote
Old 29th September 2011, 12:51 PM   #15
johnr66 is offline johnr66  United States
diyAudio Member
 
Join Date: Mar 2009
Quote:
Originally Posted by sudhir kumar View Post
I have read in the foroum that TDA1554 is better than old LA4440 but both datasheet tell that @10%THD.If the THD figure is same why one chip is better than other?
The TDA1554 is a newer IC with much less support components needed. Ignore the stupid 10% figure. That is well into clipping. These chips will do in the 12 to 15 watt range of clean power before clipping with a 14.5 volt supply. Check the THD vs frequency and THD vs power graphs if provided.
  Reply With Quote
Old 30th September 2011, 05:16 AM   #16
diyAudio Member
 
Join Date: Dec 2008
Location: bangalore
Quote:
Originally Posted by johnr66 View Post
The TDA1554 is a newer IC with much less support components needed. Ignore the stupid 10% figure. That is well into clipping. These chips will do in the 12 to 15 watt range of clean power before clipping with a 14.5 volt supply. Check the THD vs frequency and THD vs power graphs if provided.
Thanks for reply,
but some more questions
If i have two chip amps (suppose one based on TDA8947) and another (basesed on tda1554) , if i supply them with equal voltages(14.5) and put equal load(4 ohm).will there be a difference in output power ?I think my english is not good but perhaps you are getting my point.
thanks in advance.
  Reply With Quote
Old 30th September 2011, 11:59 AM   #17
johnr66 is offline johnr66  United States
diyAudio Member
 
Join Date: Mar 2009
Quote:
Originally Posted by sudhir kumar View Post
Thanks for reply,
but some more questions
If i have two chip amps (suppose one based on TDA8947) and another (basesed on tda1554) , if i supply them with equal voltages(14.5) and put equal load(4 ohm).will there be a difference in output power ?I think my english is not good but perhaps you are getting my point.
thanks in advance.
Your English seems fine to me. With the same Vs and load, the output power will be the same. In a practical test, there may be slight differences as chips can vary from lot to lot, but the difference would likely be within a watt. Since it takes 2x the power to make a perceptible change in sound (3db), you could never tell the difference.
  Reply With Quote
Old 3rd October 2011, 05:55 AM   #18
diyAudio Member
 
Join Date: Dec 2008
Location: bangalore
to johnr66,
Thank you very much for reply.It was a practical problem for me but now solved.Actually i have a ready built tda8947 kit and i wanted to use it as a car-amp but not sure about its o/p at car battery voltage so i decided to make a tda1554q.since you told that both will give approx same o/p with above conditions so i am going to use the same tda8947 kit in the car.
thank again for reply.
  Reply With Quote
Old 26th February 2014, 11:28 AM   #19
diyAudio Member
 
Join Date: Feb 2014
Can someone send me a diagram on a btl design for tda8947?
  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
12 volt power supply for tube amps caraudionut Tubes / Valves 9 27th April 2007 03:04 PM
how to build a 12 volt dc power supply? michelevit Class D 5 22nd December 2006 07:53 AM
How to use a 220 Volt power supply at 12 Volts in the car? Mr. Old School Car Audio 3 10th March 2006 12:11 AM
Suitable chip for 12 volt indoor supply Winnie Chip Amps 28 16th September 2004 09:44 AM
Power Supplies 12 Volt????? Co_Driver Solid State 3 6th May 2004 04:59 AM


New To Site? Need Help?

All times are GMT. The time now is 07:12 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