Hey Folks! Here is a link to plans on how to build a Pocket Amplifier, commonly called a "Cmoy". They are dirt cheap, easy, and fun to build, as a matter of fact, this is what I used as my first project on soldering, that and "Electronics for Dummies". I think it can come in quite handy, and be a nice addition to your Theremin equipment. Let me know what you think.
http://tangentsoft.net/audio/cmoy-tutorial/
http://tangentsoft.net/audio/cmoy-tutorial/