Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

dB Technologies Opera 405D
dB Technologies Opera 405D
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 15th March 2014, 12:36 PM   #1
Carlosraj is offline Carlosraj  United Kingdom
diyAudio Member
Join Date: Jan 2010
Default dB Technologies Opera 405D


I am very new to this Class D amp, and have a basic understanding of the theory of operation. A friend of mine asked me to have a look at this amp. It is a 2 way powered speaker. When I switch on, there is a very loud hum from the woofer. I then disconnected the woofer and the tweeter is working fine. I measured the voltage across the woofer output terminals and it was reading 28v DC. I also measured the voltage across the tweeter, when I switch "ON" , firstly it shows a reading of also 28v DC across the tweeter and then within a second or two, when the sound comes out, the voltage disappears across the tweeter. I guess it is a half bridge. Can anyone with a knowledge of class D help me with this.


  Reply With Quote
Old 15th March 2014, 02:01 PM   #2
PetruV is offline PetruV  Romania
diyAudio Member
Join Date: Dec 2012
Location: Bucuresti
your amp has blown outputs,show a picture or you wont get much more info,
Just a kid who likes building and modding things.No inspirational quote here for you
  Reply With Quote


dB Technologies Opera 405DHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
db technologies Opera 405D Carlosraj Solid State 0 11th February 2014 11:02 AM
Audax PR170M0 100 dB or just *94 dB?? rick57 Multi-Way 44 22nd December 2013 12:50 AM
help please scheme db technologies sub 05 needed or similar usblab Chip Amps 0 15th November 2012 11:14 AM
Db technologies HPA2800-repair emilm Solid State 0 1st November 2011 09:30 PM
116 db peak db how loud is that 8cube Multi-Way 21 8th November 2007 06:45 AM

New To Site? Need Help?

All times are GMT. The time now is 04:19 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio