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I very, very rarely disagree with your postings. But I will state the physics involved do not allow devices to change the temperature coefficients.
I am willing to wager what you saw was a runaway parasitic oscillation that would have mimicked a thermal runaway. I have seen that when a compensation network went resonant and provided regenerative feedback.

[QUOTE="Tallman, post: 727011, member: 32129"] I very, very rarely disagree with your postings. But I will state the physics involved do not allow devices to change the temperature coefficients. I am willing to wager what you saw was a runaway parasitic oscillation that would have mimicked a thermal runaway. I have seen that when a compensation network went resonant and provided regenerative feedback. [/QUOTE]

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