Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz> I am not impressed by the design of the circuit appearing in that LFG website. The designer obviously considers that transistors that are not fed base current don't have C-E leakage. This is not a refutation of the ideas expressed (which I have yet to study). Malcolm