ucd 25 watts to 1200 watts using 2 mosfets - Page 163 - diyAudio
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 9th February 2012, 08:58 PM   #1621
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by andrewlebon View Post
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
Amidon in the states have t106-2 core. I alos picked some up on ebay.
I just wind a couple of metres of 18swg enammeled copper wire around the core. Its a fiddle but isnt too bad.
__________________
PCBCAD50 software. http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 9th February 2012, 10:48 PM   #1622
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
Default THANKS FOR REPLYING

Hi Nigelwright
greetings thanks for replying i think amidon is my only hope to get best core t106_2 most suitable for this amp thanks once again
warm regards
andrew lebon
  Reply With Quote
Old 9th February 2012, 11:07 PM   #1623
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
Default thanks

Hi Stewin
greetings at last got it working dont have any issues on amp working
its playing great clear and powerful the pcb i posted looks bad its the first pcb on the thread after many failed attempts ifigured out how it should be assembled without blowing up parts trying to make a bridged version designing
the PCB will be a problem no PCB experience but ill try can you share any bridged schematics using IR2110 I will use IRFB4227 for outputs btw whats working frequency of this amp have you experimented with feedback 330pf
cap schematic says mica i have used 330pf ceramic 1kv i have 330pf silver mica
would changing the ceramic to silver mica make sound more clear not tried is as yet hope you can share your results
warm regards
andrew lebon
  Reply With Quote
Old 10th February 2012, 09:36 AM   #1624
Dimonis is offline Dimonis  Russian Federation
diyAudio Member
 
Dimonis's Avatar
 
Join Date: Mar 2011
Location: RF 33 Vladimir
Quote:
Originally Posted by stewin View Post
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. .
A good thing , but the gap must be larger - something about 2mm , or 4mm in the center leg.
Attached Images
File Type: jpg palnic400W_1Om_1.jpg (445.4 KB, 928 views)
  Reply With Quote
Old 10th February 2012, 02:57 PM   #1625
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
Default FEEDBACK CAPACTOR 330pf

In the feedfack, try to change capacitor C1 (330p, mica) to 150p or 100p (you can use ceramiic or anything). This should turn your switching freq from 120kHz to about 200-230kHz. This would improve filtering from 20dB to about 30dB.

Hi
greetings will changing C1 330pf to 150 pf on 50 volts dc supply work on my ucd outputs IRF250N OTHERWISE all components are same as schematic given
by egtagle
warm regards
andrew lebon
  Reply With Quote
Old 10th February 2012, 09:36 PM   #1626
stewin is offline stewin  Kenya
diyAudio Member
 
Join Date: Jul 2007
Quote:
Originally Posted by Dimonis View Post
A good thing , but the gap must be larger - something about 2mm , or 4mm in the center leg.
why large gap like 4mm
  Reply With Quote
Old 10th February 2012, 10:41 PM   #1627
Pafi is offline Pafi  Hungary
diyAudio Member
 
Join Date: May 2004
Location: Budapest
Quote:
Originally Posted by stewin View Post
why large gap like 4mm
If you want 1000 W, then fsw should not exceed 200 kHz. Then L>40 uH is advisable to achieve low idle loss. Since 100V/3 ohm (current headroom needed!) = 33A, E>22 mJ. Energy density in gap at saturation is about 40 mJ/cm^3, so at least a half cm^3 is needed for this much power. A=1.2...1.5 cm^2, so d=4 mm is a good estimation. But leakage is horror! I use 4 mm also, but in EE55 (A=3.5cm^2, L=80 uH), so it's safe and perfectly cool.

But for only 50 V and 4 ohm, 1 mm gap is OK!

Last edited by Pafi; 10th February 2012 at 10:46 PM.
  Reply With Quote
Old 10th February 2012, 11:51 PM   #1628
norazmi is offline norazmi  Malaysia
diyAudio Member
 
Join Date: Feb 2008
Agreed with Pafi
  Reply With Quote
Old 12th February 2012, 12:42 PM   #1629
stewin is offline stewin  Kenya
diyAudio Member
 
Join Date: Jul 2007
thanks pafi GOD bless you a lot
  Reply With Quote
Old 15th February 2012, 07:55 AM   #1630
akraj is offline akraj  Bangladesh
diyAudio Member
 
Join Date: Nov 2010
Quote:
Originally Posted by manojtm View Post
Hi All

Now I will give my working design!!!!!!!!!!!!!!!
Its simple and good.Protection and all other things can added later

Hi Manoj:

Electronics is my hobby and mostly excited for amplifiers, I am trying to make a class D amp using your schematic. Now can you please tell me what is meant with (SD) sing (Pin 11 of IRS2110)? And can I find the inductors in the market?

Here is the link of PCB: https://www.cx.com/mycx/share/kBI-n1.../UCD_India.pcb

Not finished yet, need to improve tracks.

Thanks in advance.
Raj

Last edited by akraj; 15th February 2012 at 08:09 AM.
  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 64 28th July 2014 11:33 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 10:28 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