Using LMH6642 as a buffer in PIMETA? - diyAudio
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Old 8th July 2008, 11:23 PM   #1
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Default Using LMH6642 as a buffer in PIMETA?

Hi all, a quick question, right as it says on the tin: I want to build the PIMETA headphone amp, but the cost of BUF634 is far too high for the build to be economical, and I'm unconvinced that the simpler alternatives like the Sijosae discrete mini-buffer deliver enough current to make them worth having at all.

My first thought was the OPA551, but I'm told that the low bandwidth will likely cause oscillation when it's inside the feedback loop of OPA2227.

So, my second thought: LMH6642. Since pin 1 on LMH6642 is unused, and pin 2 on BUF634 is unused, it seems to me that I should be able to leave the bandwidth setting circuitry in place for the BUF634, and add a short between pins 6 and 2 (that is, between OUT and -IN on the LMH6642), and still be able to use each interchangeably.

Of course, I'll need an SOIC to DIP converter board, but that's easy enough.

So, would it work? Would it work well?

Thanks for your advice!
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Old 9th July 2008, 10:16 AM   #2
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Surely somebody out there knows something about using this opamp?
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Old 10th July 2008, 01:59 PM   #3
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For anyone who happens to find this and be interested (since this thread, despite its emptiness, now tops the google results for "LH6642 buffer"), there is some discussion unfolding over at headwize: http://headwize.com/ubb/showpage.php?fnum=3&tid=7437
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