Portable Amplifier IC for 8 ohm speaker - 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 30th September 2009, 10:18 AM   #1
chingyg is offline chingyg  South Africa
diyAudio Member
 
Join Date: Sep 2009
Location: South Africa
Default Portable Amplifier IC for 8 ohm speaker

Hey guys, I am looking forward to building a powerful and portable amplifier that can fit into a back pack, and run off a single 12V 7ah battery. I have the speakers sorted out already, their impedance is 8ohm and have a power limit of 100W.

So I am looking for a simple chip amp that can provide an output of 20W - 40W into these speakers. I looked at TDA1560 but I could not obtain them, is there any other similar chips or designs I can use.

Thanks in advance.
  Reply With Quote
Old 30th September 2009, 03:05 PM   #2
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
A TI hybrid should work great for that. A TPA3122D2 will work nicely, but there are some other ones as well.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 1st October 2009, 01:26 PM   #3
chingyg is offline chingyg  South Africa
diyAudio Member
 
Join Date: Sep 2009
Location: South Africa
Thank you very much, i had a look at the data sheet of tpa3122D2, it should work just fine for my application. but I have one more question the maximum gain of the chip is 36dB, so can it be powered straight off something like a mobile phone or an iPod's audio output, or does it need a preamplifier to reach maximum output.
  Reply With Quote
Old 1st October 2009, 06:46 PM   #4
chingyg is offline chingyg  South Africa
diyAudio Member
 
Join Date: Sep 2009
Location: South Africa
Would this circuit work?
tpa3122.jpg
It is has two op amp working as a crossover network at 4000Hz, the treble goes to a ready made TEA2025 amplifier and 2 8Ohm mid range speakers.
The other two op amp change the single ended low frequency signal into a balanced and inverted signal which passes through one of those 2 in one potentiometer and goes into the TPA3122 input.

I am a newbie in electronics, especially the audio part so any help is appreciated.
  Reply With Quote
Old 1st October 2009, 09:23 PM   #5
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
Here's a friend's design based on that chip:
http://ecorenovator.org/forum/applia...ome-audio.html
Just replace the power supply with the battery. Power output will be limited at 12v, but it may still be plenty. If not, use a DC/DC converter to increase the voltage or use two 12v batteries in series.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 2nd October 2009, 02:28 PM   #6
chingyg is offline chingyg  South Africa
diyAudio Member
 
Join Date: Sep 2009
Location: South Africa
thanks alot, I would use two battery if necessary
  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
which low voltage portable IC amplifier tschrama Solid State 17 23rd February 2012 04:51 PM
Portable Amplifier, amazing..... johnchan510 Swap Meet 0 27th July 2007 05:03 AM
Portable MP3 Speaker help Xspunge Everything Else 1 31st July 2006 11:22 AM
Portable mp3 amplifier... slowfly Solid State 4 23rd September 2005 03:12 PM


New To Site? Need Help?

All times are GMT. The time now is 09:19 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