Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 6th February 2012, 02:57 PM   #1611
savu is offline savu  Romania
diyAudio Member
 
savu's Avatar
 
Join Date: Feb 2007
Location: Cluj - Napoca
Send a message via MSN to savu Send a message via Yahoo to savu
IRFB4227 is best suited. You can use rails as high as 90v.
Regards,
Savu
__________________
1'st rule of chess:
The only way to get smarter is by playing a smarter opponent.
  Reply With Quote
Old 6th February 2012, 04:19 PM   #1612
CPX is offline CPX  Romania
diyAudio Member
 
Join Date: Nov 2004
Location: Cluj
For andrewlebon :
irfb4227.Also try irfb5615

For manojtm .
Please measure THD and IMD of your design and post results here if you can.
  Reply With Quote
Old 6th February 2012, 06:17 PM   #1613
Dimonis is offline Dimonis  Russian Federation
diyAudio Member
 
Dimonis's Avatar
 
Join Date: Mar 2011
Location: RF 33 Vladimir
Quote:
Originally Posted by andrewlebon View Post
Hello
greetings can any one advice me which is most suitable mosfet for this amp
i am using IRF250 on50 volt dc rails
1 IRFB4103Pbf
2 IRFB 4227BPbf
data sheet of IRFB4103 shows Rds on@10 volts 139Mohm
data sheet of IRFB4227 shows Rds on@10 volts 19.7Mohm
can anyone advice me most suitable mosfet
warm regards
andrew lebon
Catch
It's for rail up to +-65V
The "lightest" , I.e. prefered from the top.
Attached Images
File Type: jpg 150 - 1.JPG (119.4 KB, 878 views)

Last edited by Dimonis; 6th February 2012 at 06:23 PM.
  Reply With Quote
Old 6th February 2012, 06:26 PM   #1614
Dimonis is offline Dimonis  Russian Federation
diyAudio Member
 
Dimonis's Avatar
 
Join Date: Mar 2011
Location: RF 33 Vladimir
If you desire up to 90V per rail
These will suite well.
Attached Images
File Type: jpg 200.JPG (117.6 KB, 819 views)
  Reply With Quote
Old 7th February 2012, 04:01 PM   #1615
Dwenson is offline Dwenson  Philippines
diyAudio Member
 
Join Date: Mar 2009
Location: Cavite
Send a message via MSN to Dwenson Send a message via Yahoo to Dwenson
Quote:
Originally Posted by stewin View Post
no i did not use clipping indicator but i am going to do so .on the over temp issue i used a 0.1 ohm resistor when i connect it the led does not light but when i disconnect it the led lights and relay does not go off . here is my part of the schema
whats the use of J10? when R34 and c39 are in parallen to ground? have you tested it on actual run?
  Reply With Quote
Old 8th February 2012, 02:35 AM   #1616
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
Default FINALLY WORKING

Hi
greetings can anyone guide me as its only my second sucessful d class amp
at last managed to make amp work outputs are IRF250N my supply is 50 volts
dc amp is sounding clear and powerful in 4 ohms load only problem is my output inductor after testing about 20 different cores finally managed to get cores which are luke warm on high volume testing on trying different cores of same
material with more and less turns sound quality changes more treble another core more bass how do i know which is best output inductor for me i cant get
t106_2 core here so i cant really tell what core will sound best can any one suggest where i can order t106_2 prewound 33uh inductor
warm regards
andrew lebon
Attached Images
File Type: jpg DSCN2694.jpg (306.8 KB, 736 views)
File Type: jpg DSCN2696.jpg (271.3 KB, 715 views)
  Reply With Quote
Old 8th February 2012, 09:59 AM   #1617
diyAudio Member
 
Whortless's Avatar
 
Join Date: Nov 2005
Location: Kocaeli,Turkey
Quote:
Originally Posted by andrewlebon View Post
Hi
greetings can anyone guide me as its only my second sucessful d class amp
at last managed to make amp work outputs are IRF250N my supply is 50 volts
dc amp is sounding clear and powerful in 4 ohms load only problem is my output inductor after testing about 20 different cores finally managed to get cores which are luke warm on high volume testing on trying different cores of same
material with more and less turns sound quality changes more treble another core more bass how do i know which is best output inductor for me i cant get
t106_2 core here so i cant really tell what core will sound best can any one suggest where i can order t106_2 prewound 33uh inductor
warm regards
andrew lebon
Hi,
There is something wrong in your application. This is not an ordinary ClassAB amp. Therefore you must not use wires from PCB to output mosfets. First correct this and mount the mosfets directly to PCB and then try your different output inductors again. There should be some difference. It is very difficult to say which inductor is best without any measured result.

BR
  Reply With Quote
Old 8th February 2012, 11:33 AM   #1618
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
Default THANKS FOR REPLYING

Hi Whortless
greetings thanks for replying wires are for testing all suitable mosfets available with me till i get my IRFB4227 MOSFETS
warm regards
andrew lebon
  Reply With Quote
Old 8th February 2012, 12:18 PM   #1619
Dimonis is offline Dimonis  Russian Federation
diyAudio Member
 
Dimonis's Avatar
 
Join Date: Mar 2011
Location: RF 33 Vladimir
Quote:
Originally Posted by andrewlebon View Post
Hi
greetings can anyone guide me as its only my second sucessful d class amp
at last managed to make amp work outputs are IRF250N my supply is 50 volts
dc amp is sounding clear and powerful in 4 ohms load only problem is my output inductor after testing about 20 different cores finally managed to get cores which are luke warm on high volume testing on trying different cores of same
material with more and less turns sound quality changes more treble another core more bass how do i know which is best output inductor for me i cant get
t106_2 core here so i cant really tell what core will sound best can any one suggest where i can order t106_2 prewound 33uh inductor
warm regards
andrew lebon
The cores that i see at your foto seem to be ferrite?
It's not good to make inductors on ungapped ferrite.
You can make a gap in a Ring-core with a grinder , some thing about ~3mm . So it woudn't saturate.
Like this
Attached Images
File Type: jpg DSC01967.jpg (474.3 KB, 648 views)

Last edited by Dimonis; 8th February 2012 at 12:37 PM.
  Reply With Quote
Old 9th February 2012, 08:52 PM   #1620
stewin is offline stewin  Kenya
diyAudio Member
 
Join Date: Jul 2007
Quote:
Originally Posted by andrewlebon View Post
Hi
greetings can anyone guide me as its only my second sucessful d class amp
at last managed to make amp work outputs are IRF250N my supply is 50 volts
dc amp is sounding clear and powerful in 4 ohms load only problem is my output inductor after testing about 20 different cores finally managed to get cores which are luke warm on high volume testing on trying different cores of same
material with more and less turns sound quality changes more treble another core more bass how do i know which is best output inductor for me i cant get
t106_2 core here so i cant really tell what core will sound best can any one suggest where i can order t106_2 prewound 33uh inductor
warm regards
andrew lebon
congrats andrew finaly you have it working. try to get e cores from old pc power supply and boil them in hot water . after separating them coil 30 turns and make sure you add 1mm gap using a tiny piece of old cd or dvd disc. BTW cool car stereo sony gt490

sad for me after like 4 months of my amp working it failed but i think it is tip 41 which supplies 12vlts to ir2110 which failed and caused the whole thing to collapse i was using 24ohms 3speakers each 8ohm speakers in series .

Last edited by stewin; 9th February 2012 at 09:08 PM.
  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
Philips 40/25/15 watts amplifier with Universal preamplifier circuit. renjiish Solid State 55 4th April 2014 07:08 AM
Decibel Watts VS Watts ? fivestring Solid State 11 1st April 2009 01:08 PM
AMP1-B: why only 25 watts @8ohms? theAnonymous1 Class D 10 15th August 2005 06:55 PM
Sound quality of amps at 0.3 watts vs @ typical 5 watts rick57 Solid State 2 26th March 2005 06:25 AM
Need 2 watts Vivek Everything Else 4 17th July 2003 08:29 AM


New To Site? Need Help?

All times are GMT. The time now is 02:44 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