|
DC and switch on protection |
Post Reply 
|
| Author | |
monkeypuzzle 
Young Croc 
Joined: 25 January 2005 Status: Offline Points: 924 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: DC and switch on protectionPosted: 05 March 2019 at 10:33pm |
|
Can anyone recommend any of the hundreds of protection circuits available to me? I don't mind kit based ones but don't really want to vero board them up from scratch. I probably need 4 stereo pairs to start with. I know the Velleman ones and as they have a TX on them they seem the ideal but there are cheaper options out there (minus transformers)...
Cheers.
|
|
|
blah blah blah blah blah......
|
|
 |
|
|
Earplug
Old Croc 
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
Post Options
Thanks(0)
Quote Reply
Posted: 06 March 2019 at 9:16am |
|
Be careful with some of the (cheap) units on ebay. They don´t work!  When needed, I just build my own now. And there is a good circuit on the ESP site. Here: http://sound.whsites.net/project33.htm Edited by Earplug - 07 March 2019 at 9:21am |
|
|
Earplugs Are For Wimps!
|
|
|
|
|
DjLeco
Young Croc
Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
Post Options
Thanks(0)
Quote Reply
Posted: 07 March 2019 at 7:43am |
|
Use relais with 2 pairs of contacts seried for decoupling speakers. In DC (continuous current) the relais contacts get in flames especiallly when decoupling inductive loads as speakers (voice coils) are. Look what's happened when one 30Amps relais, try to decuople around 70Vdc in resistive liad, inductive load will be worse. That's my experiment: Edited by DjLeco - 07 March 2019 at 7:03pm |
|
|
I'm A Stupid SMART Romanian...
|
|
|
|
|
Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
Post Options
Thanks(0)
Quote Reply
Posted: 07 March 2019 at 9:28am |
Yes - you need to hope that the circuit catches the fault before you get that much voltage on the output. All covered in the article I linked to above.  |
|
|
Earplugs Are For Wimps!
|
|
|
|
|
monkeypuzzle
Young Croc
Joined: 25 January 2005 Status: Offline Points: 924 |
Post Options
Thanks(0)
Quote Reply
Posted: 07 March 2019 at 1:35pm |
|
Cheers for this. They're for my stack of old Turners so the output voltage isn't that high but they are coming up to 40 years old so I need to protect my speakers, that article on reaction times is food for thought. I'll get the pen and paper out and do some thinking and plotting.
Cheers.
|
|
|
blah blah blah blah blah......
|
|
|
|
|
Post Reply
|
|
| Tweet |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options
DjLeco wrote: