There are some plans.. Search the forums here and diyaudio for "RIAA"
I know there was one called "Phonoclone" but know nothing about it. There were a few other inquiries here about what to build.
I built the one at ElliiottSound Products a while back. I actually did the 78rpm version. It's inexpensive, and quite easy to build.
It works well, very well for my use, but I don't like its sound as well as that of the phono section in my preamp (NAD c162). I was never able to get it as quiet as I wanted. It has a slight hum that disappears in mono -- which is great for 78s, but I wouldn't be satisfied for stereo recordings.
What you're after is called a phono stage usually, and there's plenty out there.
Normally I would pimp my own variant of the El-Cheapo here: http://www6.head-fi.org/forums/showthread.php?t=147056 but since my DNS will be down till saturday giving a few temporary dead links to vitals likes schematics I won't.
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