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 2013, 12:28 AM   #1
bimo is offline bimo  Indonesia
diyAudio Member
 
bimo's Avatar
 
Join Date: Sep 2010
Location: Depok, West of Java
Default High Quality Low Wattage Amplifier

I am looking a low wattage amplifier 2 to 6 watt on 8 Ohm, with minimum quality is same as LM1875. It can an IC or discrete (transistor) but with simple design.

Last edited by bimo; 22nd April 2013 at 03:48 PM. Reason: typo
  Reply With Quote
Old 9th March 2013, 01:51 PM   #2
johnr66 is offline johnr66  United States
diyAudio Member
 
Join Date: Mar 2009
To get 2 clean watts (non clipping) from an 8 ohm load, you need no less than 14 or 15 volt supply. If you need 4 to 5 watts, look at ICs rated for around 20 volts (typical use, not max supply voltage). So why not just use an LM1875 or TDA2050? These chips will run just fine at the lowered voltage.

If lower supply voltage is needed, you need a bridge amp.
  Reply With Quote
Old 11th March 2013, 06:03 AM   #3
bimo is offline bimo  Indonesia
diyAudio Member
 
bimo's Avatar
 
Join Date: Sep 2010
Location: Depok, West of Java
Thank you John, but is driving LM1875 at lower voltage an optimal design? Is there any IC with quality of LM1875 but at lower wattage and lower price?
  Reply With Quote
Old 11th March 2013, 07:43 AM   #4
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Check out LA4270. My LA4270 is buffered with 2N2222 and it has a rare quality. At 1W or 2W it sounds better than my 1875 or others.
  Reply With Quote
Old 11th March 2013, 03:37 PM   #5
johnr66 is offline johnr66  United States
diyAudio Member
 
Join Date: Mar 2009
Quote:
Originally Posted by bimo View Post
Thank you John, but is driving LM1875 at lower voltage an optimal design? Is there any IC with quality of LM1875 but at lower wattage and lower price?
It is has global negative feed back just like virtually all other power amp ICs. It will sound fine under lower voltage. Output swing is not optimized as much as some lower voltage chips, but it gets you in the power range you wanted.

The beauty of it is, you can adjust the supply voltage to what you need. Say you want more power down the road, you can upgrade to a stronger power supply. Just use components to handle the higher voltage and larger heatsink.

For example, this small monoblock that is based on the TDA2050 will operate on 5 volts to 30 volts and from 30 to 45 volts with a fan. It can produce 27 non clipping watts with a 38 volt supply (4 ohms) or about 7 watts into 8 ohms using a 24 volt power brick from an old HP inkjet printer.
Click the image to open in full size.
  Reply With Quote
Old 11th March 2013, 07:39 PM   #6
diyAudio Member
 
Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
@JohnR66

That's very sweet. I love the idea that it's a "monoblock".
  Reply With Quote
Old 14th March 2013, 01:51 PM   #7
bimo is offline bimo  Indonesia
diyAudio Member
 
bimo's Avatar
 
Join Date: Sep 2010
Location: Depok, West of Java
Quote:
Originally Posted by Jay View Post
Check out LA4270. My LA4270 is buffered with 2N2222 and it has a rare quality. At 1W or 2W it sounds better than my 1875 or others.
Jay, can you share your schematic/circuit?
  Reply With Quote
Old 16th March 2013, 01:36 PM   #8
picbuck is offline picbuck  United States
diyAudio Member
 
Join Date: May 2008
Whoa! That is one neat li'l block o' power!

Price note: the TDA2050 is $2.25 at Jameco. You're not going to get a power chip for much less.

Last edited by picbuck; 16th March 2013 at 01:47 PM. Reason: update
  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
High wattage, low resistance potentiometers grungeman91 Parts 4 4th April 2011 06:36 AM
low power high quality chip amp needed hamedfazelm Chip Amps 24 9th May 2010 11:29 AM
high quality low profile center speaker needed johnmark Multi-Way 0 9th September 2009 07:43 PM
Low wattage, high efficiency, high quality? Nordic Multi-Way 5 4th September 2005 11:12 PM


New To Site? Need Help?

All times are GMT. The time now is 04:42 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