Here's a direct conversion transceiver that might give you some ideas

http://www.intio.or.jp/jf10zl/3trcw.htm

I don't think you will find that this is a particularly good receiver,
but it is the only IC-free DC receiver I know of on the web (and its
VERY clever!).

Or, if you have a circuit that uses a CA3028 mixer, you can easily make
up the equivalent from 3 NPN transistors and some resistors.

73,
Steve VE3SMA