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The bottom line is; is his function generator powered from an external source?
If it is, then the circuit is receiving power from the function generator (assuming it is connected), via the b-e junction of Q1, and the b-c junction of Q2.
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"Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe." Frank Zappa
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