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

Solid State Talk all about solid state amplification.

SSR for speaker protection?
SSR for speaker protection?
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
Reply
 
Thread Tools Search this Thread
Old 19th April 2019, 06:19 PM   #91
LKA is offline LKA  Europe
diyAudio Member
 
Join Date: Dec 2014
Quote:
Originally Posted by prasi View Post
Hello LKA,
I put RS1,RS2,OK1 on protect pcb so that this SSR protect can be used on an existing power amp which does not have these components.

Regards
Prasi
I think this is not good idea. You create wide loop across emitter resistors.
  Reply With Quote
Old 19th April 2019, 07:43 PM   #92
marcus1 is offline marcus1
diyAudio Member
 
Join Date: Jul 2004
Found this speaker protector device for sale from neurochrome:
Guardian-686: Speaker protection board for balanced, bridged, and BTL LM3886-based amplifiers (and others).

Any comments on how this design compares with whats being discussed here?
  Reply With Quote
Old 20th April 2019, 11:47 AM   #93
prasi is online now prasi  India
diyAudio Member
 
prasi's Avatar
 
Join Date: Jan 2014
Location: Pune, India
SSR for speaker protection?
Quote:
Originally Posted by LKA View Post
I think this is not good idea. You create wide loop across emitter resistors.
OK , thanks LKA, got it. then one need not populate rs1, rs2, ok1 and the sense connector, i.e, leave them out.
__________________
My revamped site https://sites.google.com/site/analogdesign1234/
  Reply With Quote
Old 20th April 2019, 01:08 PM   #94
prasi is online now prasi  India
diyAudio Member
 
prasi's Avatar
 
Join Date: Jan 2014
Location: Pune, India
SSR for speaker protection?
Quote:
Originally Posted by thimios View Post
BTW if i will have the final schematic and the black&white pcb i can test this soon.
Ready for pdfs?
__________________
My revamped site https://sites.google.com/site/analogdesign1234/
  Reply With Quote
Old 20th April 2019, 03:15 PM   #95
prasi is online now prasi  India
diyAudio Member
 
prasi's Avatar
 
Join Date: Jan 2014
Location: Pune, India
SSR for speaker protection?
here they are. rs1,rs2, ok1 on power amp pcb as recommended by LKA.
Attached Images
File Type: png LKA-SPEAKER PROTECT-rev1.png (63.6 KB, 128 views)
File Type: png LKA-SPEAKER PROTECT-SCH-rev1.png (13.0 KB, 132 views)
Attached Files
File Type: pdf SSR_LKA_REV1_bottom copper_top view.pdf (53.3 KB, 24 views)
File Type: pdf SSR_LKA_REV1_top silk_top view.pdf (61.6 KB, 21 views)
__________________
My revamped site https://sites.google.com/site/analogdesign1234/

Last edited by prasi; 20th April 2019 at 03:17 PM.
  Reply With Quote
Old Yesterday, 01:33 PM   #96
Mark Tillotson is online now Mark Tillotson
diyAudio Member
 
Join Date: May 2018
Here's my take on a speaker protect circuit that I designed a year ago or so, basically a discrete pair of SSRs. It has rail failure detection and DC detection for two channels, using mainly SMT. Optocouplers are miniature ACPL-217-500E's, MOSFETs are DMT10H010LK3, which are 100V and 6.5 milliohm. All fits on a board 2" square. Takes the main rails for power and has a test push button.


The detection circuitry is adapted from Doug Self's designs, but instead of driving a relay I drive an LED and two optocouplers.
The L and R grounds are allowed to float a bit w.r.t. each other and the supply ground.



Note the schematic needs some improvement, I've got the wrong symbol for the zeners (they are labelled with voltages though), and the wrong part number on the MOSFETs.



The key insight is how I float a zener/capacitor 12V supply between the rails with high value
resistors, which need to be sized to provide enough current for the resistor across gate & source when the opto-coupler is on.


The cross-connected 470k resistors are to give hysteresis to the switching, but I haven't yet tested or populated those, the basic protection function works without them.

Click the image to open in full size.
  Reply With Quote

Reply


SSR for speaker protection?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
On speaker protection Keith Cary Chip Amps 3 9th February 2013 01:47 AM
speaker protection audiofan Solid State 0 19th February 2009 02:35 PM
speaker protection (OR) overload protection myanmar Solid State 7 13th July 2006 08:21 AM
FS: Niles HDS-6L speaker selector w/ speaker protection. Spasticteapot Swap Meet 0 27th May 2006 11:14 PM
Speaker Protection senee Solid State 0 17th May 2005 06:53 AM


New To Site? Need Help?

All times are GMT. The time now is 02:12 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki