omitting lowpass using tripath TA 2024 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 22nd October 2009, 02:05 PM   #1
diyAudio Member
Join Date: Mar 2008
Default omitting lowpass using tripath TA 2024


i am new to this and would be interested under which
conditions the output reconstruction lowpass filter can
be omitted in an class d amp.

When connecting a full bridge class d amp directly to a fullrange
speaker using short cables ( say < 30 cm ) , and the fullrangers
Lvc is compensated by an RC in parallel , there would in fact be
a lowpass filter.

Could the reconstruction filter now be omitted ?

Is it nessesary to shield the speaker wires to supress RF radiation ?

What do you think ?
Oliver, RFZ believer (?)
  Reply With Quote
Old 22nd October 2009, 04:56 PM   #2
diyAudio Member
Lostcause's Avatar
Join Date: Aug 2005
Location: NW UK
Default Crikey

Well that's a coincidence, I was thinking exactly the same thing but with even shorter output cables..... amps inside the speaker cabs.
I'd love to hear some opinions on that one as the output inductors are just another 'thing' in-the-way...

Damn... why didn't I think of that!
  Reply With Quote
Old 22nd October 2009, 06:42 PM   #3
diyAudio Member
Join Date: Mar 2008

yes i think i can get shorter with speaker cables maybe,
but besides unwanted RF radiation, what problems could occur ?

I thought if the HF power dissipated in the speaker is not a problem and
RF radiation could at least be shielded, this would be a way to go.

But my knowledge in HF and Radio issues is little, so i'd like to hear
some advice from the specialists ...
Oliver, RFZ believer (?)
  Reply With Quote
Old 22nd October 2009, 06:57 PM   #4
diyAudio Member
Saturnus's Avatar
Join Date: Jun 2005
Location: Copenhagen, Denmark
The main problem is that the voice is the main contributor to RF beaming ... I wouldn't do it because I don't like getting arrested for being a hazard to public safely, and get thrown in jail or at least heavily fined.

The frequency that Tripath amps work at is around the frequency used as emergency channel for marine and airspace authorities in Europe. Even a few mWs of RF noise in that frequency range is going to be taking quite seriously these days.
  Reply With Quote
Old 22nd October 2009, 07:12 PM   #5
diyAudio Member
Join Date: Mar 2008

thanks, yes i prefer listening outside of prison cells whenever possible ...
Oliver, RFZ believer (?)
  Reply With Quote


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
Yuanjing? Tripath 2024 board mod potential? Smoken Joe Class D 2 19th November 2009 11:09 PM
Chipamp's LM3886: omitting R2 mudihan Chip Amps 9 12th July 2008 03:27 AM
Aluminum 2024 jaudio Parts 0 22nd November 2005 11:53 AM
New 2024 amp and mod site Andrewbee Class D 4 2nd October 2005 01:50 PM

New To Site? Need Help?

All times are GMT. The time now is 01:22 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2