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I returned to DIY electronics in 2009 after a 20 year pause by building a few kits to get in shape. This blog is for me to keep track of my progress.
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LME49830 based amp

Posted 4th September 2010 at 06:02 PM by alexcp
Updated 8th October 2012 at 10:26 AM by alexcp

This is an implementation of National's reference design for LME49830 with two matched pairs of 2SK1530+2SJ201 per channel. The PCBs were made using National's gerbers (thus National's logos). Sounds surpisingly good, but it has just been completed; I did not have a chance to listen to it carefully yet.

Update: I rebuilt the amp as a pair of monoblocks, each delivering healthy 200W into 8 ohms. It now looks tidier.

Update: the original Gerbers from National are nowhere to be found since national.com was merged into ti.com. Attached are the original archives downloaded from the national.com.
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Attached Files
File Type: zip LME49830_EF125WT1_Gerbers_Web.zip (133.8 KB, 612 views)
File Type: zip HP_PowerSupply_4B_Gebers_Web.zip (87.4 KB, 371 views)
Views 8920 Comments 5
Total Comments 5


  1. Old Comment
    Very old post.....how does it sound, if you still have it?
    Posted 26th July 2012 at 05:56 PM by Inprogress Inprogress is offline
  2. Old Comment
    alexcp's Avatar
    It sounds ok; not that I can point at any specific problem, but it always leaves something to be desired.
    Posted 2nd August 2012 at 11:10 AM by alexcp alexcp is offline
  3. Old Comment
    Do you have AN-1850 & AN1849 gerber file ?

    I can't find them on internet because national.com become ti.com .
    Posted 26th September 2012 at 03:52 AM by cctv628 cctv628 is offline
  4. Old Comment
    alexcp's Avatar
    I have them and I attached them to the blog post.
    Posted 28th September 2012 at 09:02 PM by alexcp alexcp is offline
  5. Old Comment
    Thanks a lot
    Posted 2nd October 2012 at 12:40 PM by cctv628 cctv628 is offline

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