Clipping indicator in a class D amp? - 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 17th July 2012, 01:48 AM   #1
diyAudio Member
 
Join Date: Feb 2008
Default Clipping indicator in a class D amp?

Looking to build one of these for a car amplifier.

Power Amp Clipping Indicator

its a single channel, 1500watt amp, class D.

is there anything I need to be aware of? as its a single channel, I assume I only need one pair of diodes from the amplifier output into the circuit?

thanks!
  Reply With Quote
Old 17th July 2012, 12:32 PM   #2
ssanmor is offline ssanmor  Spain
diyAudio Member
 
Join Date: Jan 2002
Location: Madrid
In order to keep it simpler, you can only measure the difference between speaker output and one of the rails (as audio signals are symmetric in mean by nature it will provide a good indication).
In order to do so, you only need a couple of transistors and some resistors, plus a LED.
  Reply With Quote
Old 17th July 2012, 03:29 PM   #3
AP2 is offline AP2  Italy
Banned
 
Join Date: Dec 2009
Location: Italy
Quote:
Originally Posted by ssanmor View Post
In order to keep it simpler, you can only measure the difference between speaker output and one of the rails (as audio signals are symmetric in mean by nature it will provide a good indication).
In order to do so, you only need a couple of transistors and some resistors, plus a LED.
the circuit complexity has a right, just because the signals are asymmetric in nature (not symmetrical)
  Reply With Quote
Old 17th July 2012, 04:21 PM   #4
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
I saw much time ago, a clip detector very easy to use, and understand. Place a transformer across the speaker, with a primary voltage about the maximum expected speaker voltage, and a variable resistor in series. In the secondary, place a neon lamp in series with a resistor of about 100K 1/2W. The lamp will glow when near saturation of amp. Example, if the maximum expected voltage is 24V peak, use a 220 or 110V /24V reversed wired (Low voltage secondary as the primary), and a variable resistor of, say, 1K. In the secondary, the lamp. Then place the amp near the maximum power, and adjust the pot to just bright in audio peaks. It has been used in some older non-expensive tape recorders as a level indicator prior to recording head saturation.
__________________
LW1DSE
  Reply With Quote
Old 17th July 2012, 04:33 PM   #5
stoc005 is offline stoc005  United States
diyAudio Member
 
stoc005's Avatar
 
Join Date: Feb 2007
Location: Midwest in the USA
Neon light?? Transformer?? Very old skool from the 60s approach.
  Reply With Quote
Old 17th July 2012, 04:40 PM   #6
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Yes, agree. But, does it do its job? I know that this scheme is easy, non expensive and works fine.
__________________
LW1DSE
  Reply With Quote
Old 17th July 2012, 04:46 PM   #7
ssanmor is offline ssanmor  Spain
diyAudio Member
 
Join Date: Jan 2002
Location: Madrid
Quote:
the circuit complexity has a right, just because the signals are asymmetric in nature (not symmetrical)
I said symmetrical in mean (will you see asymmetries in a blinking LED?) Otherwise the audio would have a DC component most likely.
  Reply With Quote
Old 17th July 2012, 05:26 PM   #8
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by ssanmor View Post
I said symmetrical in mean (will you see asymmetries in a blinking LED?) Otherwise the audio would have a DC component most likely.
AP2, in case you have not heard this usage of mean, it means average
  Reply With Quote
Old 17th July 2012, 05:54 PM   #9
ssanmor is offline ssanmor  Spain
diyAudio Member
 
Join Date: Jan 2002
Location: Madrid
Thanks!, yes, perhaps "mean" can mean tough or other things in a different context: with "mean" I "mean" "average"
  Reply With Quote
Old 18th July 2012, 12:03 AM   #10
diyAudio Member
 
Join Date: Feb 2008
so, ah, I should build the clipping indicator from that link?
  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 indicator andrewlebon Solid State 2 23rd May 2012 05:55 PM
Should I fear the clipping indicator? ViolenceOnTheRadio Solid State 11 19th September 2010 07:50 PM
Clipping Indicator scott_jcp Chip Amps 2 5th April 2005 01:27 PM
Zen clipping indicator Vix Pass Labs 11 18th November 2004 08:08 AM
Good clipping indicator? hugobross Solid State 7 19th January 2002 06:59 PM


New To Site? Need Help?

All times are GMT. The time now is 01:23 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