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July 31, 2019 / consort3

Emitter follower oscillator

It is often held that a passive circuit cannot have gain. This emitter follower circuit with a gain of 1 oscillates. It is my version of “a cathode follower oscillator” by James G. Holbrook (1955) where he demonstrates that a passive circuit can indeed have gain! Frequency is 842 Hz.



To show the passive circuit has gain, I simulated it



Oscillation happens where the phase is zero.


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