Need Help ... Briangt Kit LM3386 doesn't work - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 3rd December 2005, 05:25 PM   #1
skappy is offline skappy  France
diyAudio Member
 
Join Date: Jan 2004
Location: France
Default Need Help ... Briangt Kit LM3386 doesn't work

Hi Everybody,
This day should have been the great day as i have just complete the construction of my first BrianGT Kit (LM3886).
I've plug a jack in a PC sound card as Input.
I've connected V+,V-, PG+ et PG- from power supply (300VA, 30 Volts & 5 Amps) to Main card ...
i've connected the mlain card to loudspeaker but nothing happens ...

Where should i search ?
Power supply works as i have 41 Volts on the main card


Thank you very much for your ideas
  Reply With Quote
Old 3rd December 2005, 05:37 PM   #2
diyAudio Member
 
Join Date: Feb 2005
Location: Watertown, NY
nothing happens? maybe the plug hooked to your pc soundcard is in the wrong jack. because usually when theres something wrong with an amp it will hum or "motorboat" or do something odd
  Reply With Quote
Old 3rd December 2005, 05:39 PM   #3
diyAudio Member
 
Join Date: Feb 2005
Location: Watertown, NY
did you try a diff source such as dvd player or cd player?
  Reply With Quote
Old 3rd December 2005, 05:45 PM   #4
skappy is offline skappy  France
diyAudio Member
 
Join Date: Jan 2004
Location: France
the pc sound card is OK, i've checked it with a another amp...
I have test the Amp with another source (portable cd player) but nothing happens ...

I would like to add that i have not use any potentiometer between sound source and the amp but as the volume was set by the Pc it should not be a problem ...
  Reply With Quote
Old 3rd December 2005, 11:20 PM   #5
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
Exclamation Innocent question ahead

Are you using a heatsink?
  Reply With Quote
Old 4th December 2005, 02:06 AM   #6
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
can u attach a picture of the board and connections?
  Reply With Quote
Old 4th December 2005, 11:29 AM   #7
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
Default I bet...

Are you suing BOTH Rectifier Circiuts with Dual Secondaries (ie, do you have two hots and two neutral legs coming form your transformer correctly attached to the PS Board?)

If you have two hots and a single Center Tap, you need to use only One rectifier circuit. Look into how the Transformer is wired for ONE Rectifier circuit on the LM3876.pdf instructions, as it does not go into this variance on the LM3886.pdf instructions.

I wired it up "incorrectly" on mine and still showed +40V -40V unattached to the amp board, but when amp boards connected, I kept blowing fuses neutral fuse (I had dual fuses on Nuetral and hot)... I could not get mine to work until I removed the 4 inner diodes and jumpered them per the LM3876.pdf.

Works great now.

My 2 cents
  Reply With Quote
Old 4th December 2005, 04:48 PM   #8
skappy is offline skappy  France
diyAudio Member
 
Join Date: Jan 2004
Location: France
Hi Everybody,
thank you very mucj for your attention and your help ...
yes , i have used a Heatsink for the LM3886
i think that my connections to the power supply is correct but i have to add that i've only plug only one way , the other one is not connected and i have observed tyhat in one case, i have something like 2 volts at the loudspeaker output, and when i change the power plug to the other way i have 0.4 volts ...
I can't undertstand

I've joined somes photos in the next messages if ithey could help...

Thank you very much for your help
  Reply With Quote
Old 4th December 2005, 04:51 PM   #9
skappy is offline skappy  France
diyAudio Member
 
Join Date: Jan 2004
Location: France
1.
Attached Images
File Type: jpg img_1271.jpg (84.3 KB, 321 views)
  Reply With Quote
Old 4th December 2005, 04:56 PM   #10
skappy is offline skappy  France
diyAudio Member
 
Join Date: Jan 2004
Location: France
2.
Attached Images
File Type: jpg img_1269_.jpg (29.1 KB, 308 views)
  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
My scope doesn't work - need help! Giaime Equipment & Tools 17 23rd September 2011 06:47 AM
Help-Car deck Doesn't work jatminder Car Audio 2 10th July 2006 08:13 AM
Right Channel on my amp doesn't work?? nicku1302 Solid State 2 29th November 2005 03:58 PM
my VRDS 7 doesn´t work! kwen10 Digital Source 2 13th January 2005 10:25 PM


New To Site? Need Help?

All times are GMT. The time now is 11:37 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