LM4781-3 Way Active Speaker

[RaviRao]

Hi everyone. Seems like a lot of people have tried the LM4781 PCB design and have various degrees of success I have not found any design on this forum that came reasonably close to the reference design. Although the Ref Design is double sided, I have done a single sided design which I have presented here for your comments.

[IMGDEAD]http://file:///home/ravi/gaf/Projects/AMPLIFIERS/POWERAMP/LM4781/LM4781-STD/V5/LM4781-V5.png[/IMGDEAD].

 

[RaviRao]

I also have done a 3 way Filter with single sided design.
[IMGDEAD]http://file:///home/ravi/gaf/Projects/ACTIVE-SYSTEMS/3Way/FILTER/V2-WPSU/3WayActiveSpeaker-FILTER.png[/IMGDEAD]

 

[RaviRao]

Sorry seems like I need to learn how to post images.....
Will revert in a while...

 

[FauxFrench]

Could it be that your image is not JPEG?

 

[RaviRao]

Thanks will try converting png to jpeg image .....

 

[RaviRao]

Heres the Filter in jpeg

file:///home/ravi/gaf/Projects/ACTIVE-SYSTEMS/3Way/FILTER/V2-WPSU/3WayActiveSpeaker-FILTER.jpeg

 

[RaviRao]

Dont think that worked as well..... any size limitations?

 

[Douglas Blake]

You can't link to a file on your home computer.

Instead you need to upload them as thumbnails. Click the paper clip icon on the top of the advanced editor or simply scroll down to the atachments and click "manage attachments". Either way the file is uploaded to the BBS so it can be accessed and displayed.

 

[RaviRao]

LM4871 PCB Single Sided

OK I finally got the method to attach files. You can see the ps file with the design.
Would like comments and suggestions from experienced people on this forum.Thanks in advance.

 

[RaviRao]

At LAST Here they are....Thanks for the patience and sorry for the bother...

Thanks very much Douglas...

View attachment LM4781-V5-PCB.pdf

View attachment 3WayActiveSpeaker-FILTER.pdf

 

[RaviRao]

Some more images that complete the set. I have made the PCBs in an effort to poulate a 3 way system I currently have with a corner Klipsch 12" version that i made way back in circa 1989...that still amazes me with the low frequency response. I have repurposed a Sony 2 way speaker to reproduce the mids and highs. If anyone is interested I shall post the progress of the project as it happens....it is however likey to be a bit slow...grandparental duties and all that