Ribbons and active XO redux - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

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 27th July 2004, 02:29 PM   #11
diyAudio Member
kingdaddy's Avatar
Join Date: Mar 2002
Location: Fort Worth, Texas
I've been using Marchand Active crossovers for years, they do have a little thump, but nothing like what you describe. I find the best way to deal with this is to never turn off the crossover, mine's been on continuously for about 3 years, no reason to ever turn it off, in fact my amps are always on as well.
  Reply With Quote
Old 27th July 2004, 02:32 PM   #12
tiroth is offline tiroth  United States
diyAudio Member
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
He is concerned about power failure.
  Reply With Quote
Old 27th July 2004, 02:42 PM   #13
Previously: Kuei Yang Wang
Join Date: Nov 2002

Originally posted by paulb
I don't recommend the 555. Here's an appropriate circuit from the renowned Rod Elliot: http://sound.westhost.com/project104.htm
The function of this is indentical to the 555 Based circuit with more parts and a less accurately defined trigger voltage and timing. But yes, it will work fine. As remarked, you can do the same thing in many ways, including fully discrete.

The essence is the following operation:

1) The circuit has a turn on Delay (a few seconds).
2) The circuit once turned on will switch off within in a very short time span (<< 100mS), unless re-triggered by an external pulse signal (eg. AC from the secondary of the mains transformer via a diode).
3) The trigger level is clearly defined such that if the the supply (AC) voltage drops below a certain level (brown out) the relais is released instantly.

The 555 can be set up as having very few added components in this operation and as doing it reliable and without significant supply voltage and thermal drifts of parameters. In that it is superior to either Rod Elliotts design or my old discrete one, though all will work just fine in practice.

  Reply With Quote
Old 27th July 2004, 07:45 PM   #14
AJ is offline AJ  United States
diyAudio Member
Join Date: Aug 2003
Location: Oregon
Thanks everyone for the input - I'll know more about what to look for in the next one I buy.

In the meantime, the UPS looks to be a reasonable solution for me.

  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
PC Speakers Redux recca Multi-Way 0 11th March 2007 01:29 AM
Ribbons and active XO - problems? AJ Multi-Way 3 26th July 2004 04:21 PM
Critical Q redux Dave Jones Multi-Way 18 20th February 2004 10:09 PM
gainclone cases redux Andrewbee Chip Amps 3 14th July 2003 06:46 PM
tube x-over noise redux jlg4104 Tubes / Valves 3 23rd December 2002 09:07 PM

New To Site? Need Help?

All times are GMT. The time now is 09:47 PM.

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