velleman k4700 speaker protection circuit - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 27th May 2005, 11:28 AM   #1
cyteen is offline cyteen  England
diyAudio Member
 
cyteen's Avatar
 
Join Date: Mar 2004
Location: S.E
Default velleman k4700 speaker protection circuit

I've just been putting this kit together and apart from getting the LEDs round the wrong way initially all went smoothly. However. when I test the unit by connecting PA on the right hand channel to V+ the relay fails to trip. When connecting PA to V- it trips fine. The left hand channel trips for both V+ and V-.

I was hoping someone would point me in the right direction.
Attached Images
File Type: jpg velleman-k4700-mog.jpg (34.9 KB, 456 views)
  Reply With Quote
Old 27th May 2005, 11:33 AM   #2
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
D4 may be installed backwards.
__________________
Frank
  Reply With Quote
Old 27th May 2005, 11:47 AM   #3
cyteen is offline cyteen  England
diyAudio Member
 
cyteen's Avatar
 
Join Date: Mar 2004
Location: S.E
Thanks for the quick reply, looking at D4 it seems to be consistant with the markings on the top of the pcb. Could I have applied too much heat at some point and killed instead?
  Reply With Quote
Old 27th May 2005, 12:03 PM   #4
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
Quote:
Originally posted by Frank Berry
D4 may be installed backwards.
Or D2 (in some cases).

Quote:
Originally posted by cyteen
Thanks for the quick reply, looking at D4 it seems to be consistant with the markings on the top of the pcb...
Repeat test procedure on right channel and measure DC voltage on both side of D4 for +V on input.

Regards,
Milan
  Reply With Quote
Old 27th May 2005, 12:23 PM   #5
cyteen is offline cyteen  England
diyAudio Member
 
cyteen's Avatar
 
Join Date: Mar 2004
Location: S.E
D2 also seems consistant with the pcb markings.

Voltage on the end away front the dark band of D4 is + and on the end with the band there is no voltage.
  Reply With Quote
Old 27th May 2005, 02:53 PM   #6
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
Replace D4. It's open.
__________________
Frank
  Reply With Quote
Old 27th May 2005, 03:16 PM   #7
cyteen is offline cyteen  England
diyAudio Member
 
cyteen's Avatar
 
Join Date: Mar 2004
Location: S.E
Many thanks.
  Reply With Quote

Reply


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
K4700 PCB (Speaker Protection) GeorgeP1111 Multi-Way 2 3rd February 2014 10:08 PM
Velleman K4700 dome406 Multi-Way 4 24th March 2008 12:14 AM
FS: heatsinks, velleman K4700, bosoz PSU, etc cowanrg Swap Meet 6 17th January 2007 02:15 PM
speaker protection velleman k4700 wuffer Multi-Way 2 1st March 2005 05:09 PM
Velleman K4700 kit problem supernet Parts 2 5th November 2004 07:13 PM


New To Site? Need Help?

All times are GMT. The time now is 07:46 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