Resettable fuses in power rails thoughts - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 September 2013, 06:05 PM   #11
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
Mooly's Avatar
Join Date: Sep 2007
Originally Posted by Aucosticraft View Post
can we think of some relay circuit that will disconnect power rails when high current flows. and switch on back after certain time?
What if the high current were a short. The relay would then try and re-connect the rails into that short. Also the relay control circuit would need to be fed from a reliable independent supply.
  Reply With Quote
Old 15th September 2013, 06:14 PM   #12
diyAudio Member
Join Date: Nov 2009
Location: Pune
I agree....... but then we have slow blow fuse too. and if the slow blow fuse too blows off then, we can feel sure that it is dead short. ( the slow blow fuse will blow off after couple of relay resets.)

Add: OR we can say, depending on the current flow , relay should determine, if it should reset.
There is always a first time....
  Reply With Quote
Old 15th September 2013, 06:18 PM   #13
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
Mooly's Avatar
Join Date: Sep 2007
Complicated... you would have to sample the current and have some means of determining if the relay should operate again based on the current that actually blew the fuse.
  Reply With Quote
Old 15th September 2013, 09:47 PM   #14
DUG is offline DUG  Canada
diyAudio Member
Join Date: Jan 2003
Location: mississauga ontario canada
If you have a fast acting circuit disconnect then how are you going to set off a slow blow fuse?

Have you ever had a computer power supply that just kept chirping every second or two?

That is an automatic retry on an over current or short circuit situation.

With analog circuitry you can do as I suggested in post #5 and with added digital decision making (4 tries and stop) you can stop it from starting again until an operator reset occurs.

Nothing new here.

But do you need it in your amp?

If you really do then go for it...I will help where I can.

Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  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
Benefits/Drawbacks of Dual rails vs Single Rails buzzforb Pass Labs 2 25th May 2011 01:06 PM
Power Acoustik TS980 sparks, blows fuses even without power on. BoeroBoy Car Audio 7 30th September 2010 02:17 PM
build power supply for35vdc rails doggy Power Supplies 17 10th January 2006 04:56 AM
Fuses, primary, rails, current limiters and channels? rgrayton Chip Amps 4 5th August 2005 04:15 PM
Raychem resettable fuses jackinnj Everything Else 5 17th January 2003 08:47 PM

New To Site? Need Help?

All times are GMT. The time now is 03:25 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