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LME 49600 as output buffer help

post #1 of 6
10/9/09 at 4:22pm
Thread Starter 
I have built a dozen or so CMOY's and modified CMOY's, and I am now building a desktop HP amp that I would like to use LME 49600's as output buffers like MINT and other amps use the TI BUF 634's.

I have 5 samples in the TO263 package, and I have soldered longer leads on the 5 legs so I could use it in my perfboard, but I am having some trouble making the jump from Nationals headphone amp schematic in the LME's data sheet to a design that will work on half of a a RS perfboard (276-150).

Anyone have a straight forward layout that that I can use???

Any and all help appreciated, and assume I know nothing beyond what I learned building my CMOY's.

Thanks,
Drew
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post #2 of 6
10/9/09 at 4:54pm
I know this is only sort-of help, but put your schematic into Eagle and then start trying to layout a PCB in it. Use the rats-nest button to help figure out what really needs to be connected to what. This will help you understand what needs to be on what strips.
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post #3 of 6
10/9/09 at 6:40pm
Thread Starter 
I guess I need to download a copy of Eagle now, huh...
I will try it when I get a chance over the weekend.

Thanks, any help is good help right now I am just scratching my head looking at it
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post #4 of 6
10/10/09 at 12:52pm
I did some testing with the LME49600 and it doesn't really like long leads, I soldered leads for breadboard use as well and the performance & sound quality was very poor. Things changed alot when the chip was soldered directly to a properly designed board, keeping the feedback loop small and following the data sheet directions for the thermal pad. I never followed through with the amp though as it didn't seem to offer because it didn't offer the performance I was looking for. It's atleast as good as the buf634 though, it might work well in a pimeta style amp.
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post #5 of 6
10/10/09 at 2:52pm
Thread Starter 
RW

thanks for the input, I still want to try it in a breadboard before I scrap the whole idea. My add on leads will probably only be 1/4 in, just enough to spread the legs into breadboard spacing and I did shrink tubing right up to the base so hopefully it wont ruin the sound too badly.

any other input from the rest of the DIY cognoscenti?
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post #6 of 6
10/10/09 at 4:30pm
You must follow the schematic and also cut the strips in the right places and this could be tricky part. My BUF634 design look like this.
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