I'm tinkering with a "simple" so far it contains 4 BC547's
It is a mud of different designs.
The patterns generator has been made by
Hans Summers.
The genneral idea was taken from a pixie2, thought the signal doesn't look to good.
A good lpf takes rather good care of that though.
The output RF level is about 40mW in 50 Ohm.
Bill Meara (n2cqr) hosts a great podcast,
soldersmoke.
Vy 73 de OZ2DAK, Soeren