Go Back   Home > Forums > > >

Elektor News and offers from Elektor Magazine

Thread Tools
Old 9th June 2008, 08:18 AM   #21
togo is offline togo  Austria
diyAudio Member
Join Date: Jun 2008
And here the security schematic.

Attached Images
File Type: jpg sec.jpg (95.4 KB, 1985 views)
  Reply With Quote
Old 9th June 2008, 08:25 AM   #22
togo is offline togo  Austria
diyAudio Member
Join Date: Jun 2008
And a photo of my amp.
Attached Images
File Type: jpg amp.jpg (97.4 KB, 2001 views)
  Reply With Quote
Old 11th June 2008, 05:55 PM   #23
togo is offline togo  Austria
diyAudio Member
Join Date: Jun 2008
Ok something new:

I have powered up the caps in the psu.
C22,C23 each 440F/100V
C19,C26 each 4700F/25V
C20,C21 each 220F/16V

4 little caps 4,7pF like in the schematic from the AF-3.

Nothing helps against my nasty noise in the power-off sequence.
So i take this caps out of my design.

It's a funny amp from elektor.
You can put in and take out elements and it wouldn't be better or worse :-)

Don't know what else i can/should do.
  Reply With Quote
Old 11th June 2008, 07:57 PM   #24
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
Netlist's Avatar
Join Date: Jan 2003
What Jan said made sense to me.
What about making a fixed connection with your bench power supply (+ and - 12VDC) that remains on after powering down the amp
What is that 12V used for?
  Reply With Quote
Old 26th August 2009, 01:08 PM   #25
runebivrin is offline runebivrin  Sweden
diyAudio Member
runebivrin's Avatar
Join Date: Jul 2003
Location: Huddinge, Sweden
Send a message via MSN to runebivrin
Am I the only one who thinks the transformers look a little small for a 1000W amp?

I wonder if it might not be a good idea to connect the caps for the 90V supply from the 90V rail to ground, rather than to the 12V rails. But since there's a definite need for a beefier transformer, why not get a 60-0-60 transformer and skip the stacked power supplies?

EDIT: I just realized that those supplies only feed the driver circuitry. I suppose there's a hefty toroid underneath?
Still, I'd change the supplies to stack the secondaries of the transformers directly, and then rectify and filter the individual voltages separately.
Do wizards use spell checkers?

Last edited by runebivrin; 26th August 2009 at 01:15 PM.
  Reply With Quote
Old 7th December 2011, 08:15 PM   #26
boris_dumery is offline boris_dumery  Belgium
diyAudio Member
Join Date: Oct 2009
Location: Lige

Is it possible to have a copy of your cd with titan 1000 / gigant 1000 please?

txs for replying.

Best regards.


  Reply With Quote
Old 18th September 2014, 07:02 AM   #27
victoryz is offline victoryz  India
diyAudio Member
Join Date: Jul 2011
can anyone pl help looking for old issues of elekto june1986 n augst1986 for portable mixer part1 n 3.
  Reply With Quote
Old 18th September 2014, 08:41 AM   #28
carolus is offline carolus  Belgium
diyAudio Member
Join Date: Jan 2005
Location: Brussel
Originally Posted by victoryz View Post
... help ...elekto june'86 & augst'86 ....portable mixer part1 n 3.
Hi Victoryz

I have () ... only in "Dutch" (Nederlandse taal)
(ref.: "Maandblad elektuur" : Draagbaar mengpaneel compact en veelzijdig, auteur A. Schmeets).

Allez, salukes.
  Reply With Quote
Old 4th December 2014, 05:46 PM   #29
okcrum is offline okcrum  United States
diyAudio Member
Join Date: Jul 2011
You're seeing the 70V power amp supply still holding up (from C15/C16?) at turn off, after the 90V discharges and the output devices shut off, I think.

The diodes are definitely necessary in this case.

Last edited by okcrum; 4th December 2014 at 05:55 PM.
  Reply With Quote
Old 4th March 2016, 07:05 AM   #30
guidobullo is offline guidobullo  Italy
diyAudio Member
Join Date: Jan 2016
Location: Chioggia
Default buzz

anch'io avevo gli stessi problemi! ronzio e ritardo sul relay.
gli ho risolti cambiando la protezione con quella fornita assieme al crescendo.
il ronzio e svanito completamente applicando alle due alimentazioni le regole dettate dalla National per l'alimentazione da applicare al finale composto con LME49830.
tutti i difetti sono spariti e come ho gia detto il suono e diventato superbo.
un'altra cosa voglio dire gli stessi difetti erano presenti nel crescendo ed allora gli avevo eliminati stabilizzando a transistor l'alimentazione.
spero di essere stato utile
too had the same problems! buzz and delay on the relay.
I solved by changing the protection that came with your growing.
the buzz and vanished completely by applying the two supplies the rules dictated by the National for the power to be applied to the final compound with LME49830.
all the faults have disappeared and as I said the sound and become proud.
another thing I want to say the same defects were present in the growing and then I had eliminated by stabilizing the power transistor.
I hope I was helpful
  Reply With Quote


Elektor-Giant 1000WHide this!Advertise here!
Thread Tools

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
Giant BIB's For Sale in MN pjanda1 Swap Meet 3 9th July 2009 01:20 AM
Giant Subwoofer? zenmasterbrian Subwoofers 395 18th February 2009 09:21 PM
1000W amp amavadia Class D 3 23rd June 2006 02:14 AM
1000w car amp Ewok_Poacher Car Audio 19 5th August 2004 08:31 AM

New To Site? Need Help?

All times are GMT. The time now is 06:12 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio