Hey there Tubejunke ,
Yes Sir ! , I'll bet you could whip one of these up in an afternoon's tinkerings . I know it wouldn't be all slick and prepackaged like a commercially made product but the fun factor of breadboarding something like this would be great . The really neat thing here is that it is at it's essence a Bridge circuit and thus really isn't too component extensive . I will attempt to post the schematic of my C2 for you , so that if you do whip one up ya got a solid design to build from .
Have a Great Day and Happy Restoring
