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 11th January 2010, 10:39 AM   #1
Arend is offline Arend  Netherlands
diyAudio Member
 
Join Date: Feb 2008
Default lm1875 pcb layout for gainclone.

Hallo,

I am a newbie in diy elektronics, but I want to make a lm1875 amplifier. I've found several pcb layouts for the gainclone circuit, but they aren't in black and white, so I can't use them with out modification.

Does anyone has a pcb layout? It would make it a lot easier for me.



ps. I've found this one: http://i239.photobucket.com/albums/f...Layout1875.jpg but it's not as minimalistic as the gainclone circuit. I don't like the elco in the signal pad. (I don't know what the effect will be on the audio quality)


Regards,


Stefan
  Reply With Quote
Old 11th January 2010, 11:31 AM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
make sure you adopt an AC coupled schematic that has RF filter on the input and Zobel load at the output.
__________________
regards Andrew T.
  Reply With Quote
Old 11th January 2010, 12:45 PM   #3
ratza is offline ratza  Romania
diyAudio Member
 
ratza's Avatar
 
Join Date: Dec 2007
Location: Sibiu, Romania
See if these suit your needs.
Attached Files
File Type: zip LM1875_amplifier.zip (22.3 KB, 818 views)
__________________
Any solution is a compromise.
  Reply With Quote
Old 11th January 2010, 02:06 PM   #4
91art is offline 91art  Aruba
diyAudio Member
 
Join Date: Jul 2009
[QUOTE=Arend;2043180]Hallo,

I am a newbie in diy elektronics, but I want to make a lm1875 amplifier. I've found several pcb layouts for the gainclone circuit, but they aren't in black and white, so I can't use them with out modification.

Does anyone has a pcb layout? It would make it a lot easier for me.



ps. I've found this one: http://i239.photobucket.com/albums/f...Layout1875.jpg but it's not as minimalistic as the gainclone circuit. I don't like the elco in the signal pad. (I don't know what the effect will be on the audio quality)


Regards,

It look like this circuit'PCB, Lots of guys do it . It was said very good.
You can also try 2, 3circuit,It was said the third is the best.The second is better than the firist circuit. I use the samplest.
  Reply With Quote
Old 11th January 2010, 02:12 PM   #5
91art is offline 91art  Aruba
diyAudio Member
 
Join Date: Jul 2009
look at this Beginner's Gainclone, HiFi LM1875, The Amplifier Board think it's the same,he explain it very claer,Sorry for my poor English,maybe you don't unerstand what i said.
and the otrer two circuit without pcb.
Attached Images
File Type: jpg 20080623_a84a71ef18a68e2a54084zka0VKfgb34.jpg (12.3 KB, 1035 views)
File Type: jpg 1875扩流.jpg (130.2 KB, 1020 views)

Last edited by 91art; 11th January 2010 at 02:17 PM.
  Reply With Quote
Old 11th January 2010, 05:50 PM   #6
Arend is offline Arend  Netherlands
diyAudio Member
 
Join Date: Feb 2008
Thank you very much!

No problem with your english 91art, (I'm also not a native speaker myself)

I'm gonna use the pcb from ratza.
  Reply With Quote
Old 11th January 2010, 07:28 PM   #7
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Ratza's PCB needs the power ground to pass up between the decoupling capacitors. The long Power ground traces that tie in the caps adds too much inductance to let the little 100nF caps do any good.
The signal ground should be separate from the power ground.
Leave a pair of pads to connect the signal ground to the ground terminal by a copper link wire or a 10r resistor and a pair of inverse parallel diodes.

Look at the Power ground and the Signal ground in post4 middle pic for ideas.
__________________
regards Andrew T.

Last edited by AndrewT; 11th January 2010 at 07:31 PM.
  Reply With Quote
Old 12th January 2010, 07:39 AM   #8
ratza is offline ratza  Romania
diyAudio Member
 
ratza's Avatar
 
Join Date: Dec 2007
Location: Sibiu, Romania
AndrewT, you're right regarding traces' inductances. Yet the amp is mute. I just wanted a very compact board in THD technology.
__________________
Any solution is a compromise.
  Reply With Quote
Old 12th January 2010, 02:16 PM   #9
mravlca is offline mravlca  Slovenia
diyAudio Member
 
mravlca's Avatar
 
Join Date: Jul 2009
Location: Ljubljana
Quote:
Originally Posted by ratza View Post
See if these suit your needs.
Ratza could you post schematic for this project?

Regards Aleš
  Reply With Quote
Old 12th January 2010, 06:35 PM   #10
Arend is offline Arend  Netherlands
diyAudio Member
 
Join Date: Feb 2008
mravlca,

The schematic is from the lm1875 datasheet, the one with the symmetric power supply.
  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
Please check my LM1875 PCB layout Dominique Chip Amps 27 15th January 2009 04:36 PM
Feedback on Gainclone PCB layout Wanted maria_andersson Chip Amps 29 28th September 2005 11:03 PM
LM1875 PCB Layout mangrovejack Chip Amps 23 25th July 2005 10:03 PM
Need LM1875 PCB layout !! thomgun_lc Chip Amps 9 10th May 2005 11:35 AM


New To Site? Need Help?

All times are GMT. The time now is 04:10 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