Dx Blame MKIII-Hx - Builder's thread - Page 99 - 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 14th February 2012, 10:05 AM   #981
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
No.
4700uF +4700uF connected in series = 2350uF

60Vdc is very close to the 63V maximum rating for the majority of affordable smoothing caps.

You may find that in worst case conditions that your mains supply takes your smoothing caps above 63Vdc. That will require you to specify 75V or 80V capacitors.
__________________
regards Andrew T.
  Reply With Quote
Old 18th February 2012, 01:32 PM   #982
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
Can someone tell me how a speaker protection module works?
Works a speaker protection module only if the module gets voltage from the amplifier?
I hear no click after 10 seconds as it is connected, see picture 2
The small transformer is 1 x 12 volt.

Regards,
Rudy
Attached Images
File Type: jpg speaker protection module.jpg (144.8 KB, 251 views)
File Type: jpg Speaker protection 12v.jpg (506.5 KB, 237 views)
__________________
Itís not what you know, but who you know ďand where they areĒ

Last edited by BMW850; 18th February 2012 at 01:38 PM.
  Reply With Quote
Old 18th February 2012, 02:14 PM   #983
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
Another photo, this is the good way how the amplifier is connected to the module?

Regards,
Rudy
Attached Images
File Type: jpg speaker protection module 1.jpg (157.9 KB, 207 views)
__________________
Itís not what you know, but who you know ďand where they areĒ

Last edited by BMW850; 18th February 2012 at 02:17 PM.
  Reply With Quote
Old 18th February 2012, 02:22 PM   #984
diyAudio Member
 
Join Date: Apr 2008
Quote:
Originally Posted by BMW850 View Post
Can someone tell me how a speaker protection module works?
Works a speaker protection module only if the module gets voltage from the amplifier?
I hear no click after 10 seconds as it is connected, see picture 2
The small transformer is 1 x 12 volt.

Regards,
Rudy
Hi,

According to the circuit diagram found here, that module connects between the amplifier output and the loudspeaker. When powered by a 12Vac supply, if a DC offset of positive or negative polarity is detected at the amplifier output, the relay contacts open and disconnect the load. There is also a delay of a few seconds before the relays close at power-up.

Regards,
currentflow
  Reply With Quote
Old 18th February 2012, 02:25 PM   #985
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
Works a speaker protection module only if the module gets voltage from the amplifier?
I hear no click after 10 seconds as it is connected.

Regards,
Rudy
__________________
Itís not what you know, but who you know ďand where they areĒ
  Reply With Quote
Old 18th February 2012, 02:28 PM   #986
diyAudio Member
 
Join Date: Apr 2008
Quote:
Originally Posted by BMW850 View Post
Another photo, this is the good way how the amplifier is connected to the module?

Regards,
Rudy
From your post #983, the 12V transformer is incorrectly wired. If you don't have a centre-tapped transformer, the transformer leads should go between "0" and one of the "AC" terminals. In this way, you will only achieve half-wave rectification of the 12V supply and this may be insufficient to power the circuit.

There has to be no voltage from the amplifier for the relays to connect the output to the speakers.

Last edited by currentflow; 18th February 2012 at 02:31 PM.
  Reply With Quote
Old 18th February 2012, 02:36 PM   #987
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
Kevin emailed me this:
Dear Sir:
http://www.okaphone.nl/product/images/212048c.jpg
This transformer is 12-0-12 full wave output.
What you need should be simpler one. Just need to have one 12-0 output, 1A current is quite enough.

Sincerely, Kevin
- vintage_audio_lab

Oke currentflow, I wire one to the 0 and the other to the AC.

Thanks
__________________
Itís not what you know, but who you know ďand where they areĒ

Last edited by BMW850; 18th February 2012 at 02:40 PM.
  Reply With Quote
Old 18th February 2012, 02:53 PM   #988
diyAudio Member
 
Join Date: Apr 2008
Quote:
Originally Posted by BMW850 View Post
Kevin emailed me this:
Dear Sir:
http://www.okaphone.nl/product/images/212048c.jpg
This transformer is 12-0-12 full wave output.
What you need should be simpler one. Just need to have one 12-0 output, 1A current is quite enough.

Sincerely, Kevin
- vintage_audio_lab

Oke currentflow, I wire one to the 0 and the other to the AC.

Thanks
If you are using an external single-ended transformer in this circuit and not a 12V-0-12V type, you should verify that the on-board 12V regulator has sufficient input voltage to regulate correctly. Unless a low-dropout 12V regulator has been fitted, you will require at least 14.5V DC at the input to the regulator under load (i.e. relays activated) and measured between the junction of D1-D2 and GND. I don't envisage this will be a problem as you should be able to achieve approximately 16 VDC.

Last edited by currentflow; 18th February 2012 at 03:03 PM.
  Reply With Quote
Old 18th February 2012, 03:28 PM   #989
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
I measuring 13,2v between 0 and the entrance of the 7812 the current is to low.
I have the speaker protection tested with the light bulb tester and speaker protection works well.
The speaker protection click after 6 seconds

Rudy
__________________
Itís not what you know, but who you know ďand where they areĒ

Last edited by BMW850; 18th February 2012 at 03:36 PM.
  Reply With Quote
Old 18th February 2012, 03:36 PM   #990
diyAudio Member
 
Join Date: Apr 2008
Quote:
Originally Posted by BMW850 View Post
I measuring 13,2v between 0 and the entrance of the 7812 the current is to low.
I have the speaker protection tested with the light bulb tester and speaker protection works well.

Rudy

I don't think your transformer is adequate. What is its specification?

Can you measure the output from the regulator: a) with the relays on, and b) with the relays off please.
  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
Dx Blame ST - Builder's thread - post pictures, reviews and comments here please. destroyer X Solid State 1711 17th August 2014 01:37 AM
Dx Blame MKIII Supercharged will soon be released destroyer X Solid State 346 22nd April 2014 03:01 PM
group buy for DX Blame MKIII Hx PCBs ByronInPortland Group Buys 247 5th December 2012 12:05 AM
Group By: DX Blame MKIII Hx boards ByronInPortland Group Buys 9 19th July 2011 07:21 AM
Dx Blame MKII, an obvious evolution from the Dx Blame ES/ST destroyer X Solid State 4 25th September 2010 06:41 PM


New To Site? Need Help?

All times are GMT. The time now is 05:17 PM.


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