protection for tweeters - diyAudio
Go Back   Home > Forums > Live Sound > PA Systems

PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

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 3rd August 2014, 01:16 PM   #1
diyAudio Member
Join Date: Dec 2013
Location: Prilep
Send a message via Skype™ to pecedelfin
Default protection for tweeters

This is my protection for tweeters,tested and work well,adjusts the trimmer potentiometer before the amplifier to clip, LED lights,and relays are switched tweeter gets reduced signal through the resistor 100 oma.If someone wants to improve results can simulate anything to add any comment is welcome.
signal taken from the output of the tweeter crossover.
Attached Files
File Type: pdf skret.LAY].pdf (9.6 KB, 78 views)
  Reply With Quote
Old 3rd August 2014, 08:07 PM   #2
diyAudio Member
Join Date: Apr 2010
If the rectified voltage is too high e g. 25vdc you could overload the relay coil. Also, the capacitor, I think its microfarad not millifarad right? still, it can cut into the signal peaks. what do you expect from this circuit over the standard light bulb?
  Reply With Quote
Old 3rd August 2014, 08:49 PM   #3
Sonce is offline Sonce  Macedonia
diyAudio Member
Join Date: Jan 2014
Location: Macedonia
I prefer light bulb, or PTC parallel to R=22 ohm / 20W (or 40 W). Simple, tried and tested.
Your solution has an abrubt action and that is not good, also R=100 ohm is too big, use 22 ohm/20W (or 40W - depends on driver) instead. ViennaTom also has a valid point regarding the overloading.
Look at Dynacord datasheets - they have more elaborate protections with reley and light bulbs.
  Reply With Quote
Old 4th August 2014, 06:05 AM   #4
RJF is offline RJF  Australia
diyAudio Member
Join Date: Dec 2013
Location: Sydney,
Regular 1N4007es may be a bit slow (a similar circuit I designed and use, uses the UF series Diodes).
the Polarity of your LED is reversed (simple typo I am sure).
and there is nothing to limit the current through the Relay and LED so in extreme cases they may fail.
also disconnecting tweeters from a 2nd order cross over can be problematic, with some less stable amplifiers, as it will essentially leave a tuned circuit across the amplifier which CAN (but hopefully won't) result in stability issues....
your basic thinking is reasonable however,
This is my design (similar thinking but somewhat more developed):
Australian Technical Production Services
  Reply With Quote
Old 13th August 2014, 10:06 AM   #5
diyAudio Member
Join Date: May 2002
Location: Switzerland
I can agree on the stability issue from personal experience. When you wire the relay contacts differently this problem is ameliorated though. You simply connect the resistor accross the opening contact instead of having it in series with the closing one and you will never have a no-load situation for your crossover.

I once did something similar and I used the transistor as current source which guarantees that the relkay coil can't be overloaded. You wiull have to take care of the Vce and dissipation of the transistor however.

I can maybe undig my old circuit diagram.


  Reply With Quote
Old 13th August 2014, 02:10 PM   #6
RJF is offline RJF  Australia
diyAudio Member
Join Date: Dec 2013
Location: Sydney,
something like this Charles?

Click the image to open in full size.
  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
Karlson tube tweeters - helper tweeters freddi Multi-Way 1 2nd March 2014 08:46 PM
Want to trade: Scan Speak 3/4 D2004/602000 tweeters for Scan D3004/602000 tweeters. Golden Ears Swap Meet 0 17th August 2012 12:31 AM
Combined DC protection and tweeter protection? CopperTop Solid State 10 13th January 2011 07:52 AM
FS - Focal TC90K Tweeters MATCHED PAIR Tweeters Mint Condition Unused. Julss Swap Meet 1 20th May 2010 03:45 PM
speaker protection (OR) overload protection myanmar Solid State 7 13th July 2006 08:21 AM

New To Site? Need Help?

All times are GMT. The time now is 03:13 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