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See for yourself! I used to think an opamp configured with a positive feedback network always resulted in an unstable system, but this simple circuit proved me wrong...
There's nothing fishy in the circuit, feel free to redraw it by yourself!
In this particular configuration, given the specific resistor's values (and in particular, as long as the feedback resistor is less than 15K), you can actually amplify without distortion the input signal.
But, as soon as that resistor goes over 15K, the output saturates and can no longer recover until power is cut.
So yes, this is a circuit which can't be trusted, if you ask me, but a remarkable outcome nonetheless.
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