There are plenty on the net, some good, some not so good.
Passive or active EQ is an issue, one or two stage for active, passive
pretty much has to be two stage, I never seen a single stage version.
A lot are op-amp based. Some of the transistor versions are poor,
too simple, finding an elegant design is difficult, and then there are
the FET versions some swear by, they need some serious supplies
to avoid the inherent limitations of the circuitry.
I think a collection will only confuse, as there are so many approaches.
but for example :
Checkout the Pearl : http://www.passdiy.com/pdf/pearlphono.pdf
For op-amps see http://www.diyaudio.com
- lots of choices and opinions.
For transistors I'd say older classics schematics are your best bet.