Clipping Class D ? - 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 16th January 2006, 12:12 PM   #1
Joules is offline Joules  United States
diyAudio Member
 
Joules's Avatar
 
Join Date: Nov 2004
Location: Manassas virginia usa
Default Clipping Class D ?

What happens when class D clipp's? What does it sound like? as compared to, say, a class A/B ?
  Reply With Quote
Old 16th January 2006, 12:15 PM   #2
SSassen is offline SSassen  Netherlands
diyAudio Member
 
SSassen's Avatar
 
Join Date: Mar 2005
Location: Edam, The Netherlands
Depends on the topology used, the Hypex UcD modules sound very much like a standard class A/B amplifier. But really, why would that be a concern? Will you be running a class-D amplifier near its maximum rating? If so, you need a more powerful one perhaps

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
  Reply With Quote
Old 16th January 2006, 12:35 PM   #3
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
This will mostly depend on the feedback topology used. Some additional soft-clipping measures can be taken as well.

If no soft-clipping tricks are used the following applies:
The least nasty (i.e. cleanest) clipping is from non-NFB topologies closely followed by first order loops with a high dominant pole freqency.
Higher order loops have the habit to "stick to the rails" when driven into clipping.

Regards

Charles
  Reply With Quote
Old 16th January 2006, 12:43 PM   #4
nitrate is offline nitrate  United Kingdom
diyAudio Member
 
nitrate's Avatar
 
Join Date: Jun 2005
Location: England, Lancashire
Greet's

I was running my amp into clipping for a prolonged time over the new year ( celebrations and all that ). The amp is a home built self osc classD of my own design. The first thing that goes is the bass, this is followed by audiable clipping across the rest of the spectrum that sounds quite soft in comparison to A/B clipping. I would say the amp sounds like it backs down during clipping. I would not describe it as a harsh or damaging clip sound. I was rather drunk but it can't have sounded that harsh as i let it carry on like that for a large part of the early morning celebrations, i wouldn't delibratly harm my baby LOL

I can't speak for the other amps on here but i think the clipping is certaintly no worse than A/B. I gather you are worried about the amp self destructing at clip or somthing. I know i was, but after a few partys my confidence has grown and i now know it is rarther hard to damage these amps. The only time mine is destroyed nowadays is when i'm hot pluging and removing components from the breadboard.

Regards
Mad.P

P.S The amp was running 80RMS into 8R when clipping. Lasted all night!
__________________
The perfect amplifier is a piece of wire with gain....
  Reply With Quote
Old 16th January 2006, 12:46 PM   #5
SSassen is offline SSassen  Netherlands
diyAudio Member
 
SSassen's Avatar
 
Join Date: Mar 2005
Location: Edam, The Netherlands
Nitrate,

Quote:
i now know it is rarther hard to damage these amps.
Try short circuiting the output, your output MOSFETs and fuses will blow faster than you can blink an eye. For added effect do this at a high output rating, i.e. driving the amplifier and connected loudspeaker at considerable volume, now you will see sparks fly

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
  Reply With Quote
Old 16th January 2006, 12:51 PM   #6
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
You can even run them into clipping at quite high-frequencies for prolonged periods. Now try this with the average AB amp out there !

Regards

Charles
  Reply With Quote
Old 16th January 2006, 12:53 PM   #7
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Hi Sander,

Please have a mercy on Mad.P's amp..donot direct him to short circuit his amp...donot rule his mind

K a n w a r
  Reply With Quote
Old 16th January 2006, 12:55 PM   #8
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Quote:
Originally posted by phase_accurate
You can even run them into clipping at quite high-frequencies for prolonged periods. Now try this with the average AB amp out there !

Regards

Charles

Dear Charles Leymann,

Nothing happened only harshness in Treble was encountered....

K a n w a r
  Reply With Quote
Old 16th January 2006, 12:55 PM   #9
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Hi Kanwar

How is your amp BTW ? Anything fried so far ?

Regards

Charles
  Reply With Quote
Old 16th January 2006, 12:59 PM   #10
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Nothing Fried in the amp...but it fried a 20MFD cap connected as a shunt to check out capacitive load drivabilty...that all....

One question...In my POST filter feedback amp when no load connected..i.e. open circuit ..does the feedback automatically take cares of Q of Filter.... when no load is connected...I have cliiped the amp with open circuit and nothing happened...
amazed...

K a n w a r
  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
Clipping richie00boy Class D 2 16th January 2008 05:36 AM
class-d behavior at clipping raintalk Class D 7 13th September 2007 12:34 PM
Clipping GC? drfrink24 Chip Amps 29 1st April 2005 10:14 PM
What is clipping? guitargully Solid State 5 25th February 2004 08:24 PM


New To Site? Need Help?

All times are GMT. The time now is 11:29 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