An engineer asked me for help when he encountered what appeared to be strange phenomenon while testing a prototype circuit in the system. He saw “mysterious” clipping distortion of the signal at the output of his emitter follower. He told me that he checked this follower with a much-heavier (smaller-value) resistive load than the actual load, but did not see any visible distortions. However, when he connected his prototyping board to the system, there was significant clipping of
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