Opto in amplifier screws up output

Also, operation would be more obvious if you used a *much* smaller transistor, or a much lower value resistor that's actually loading the transistor to a modest fraction of its rating. Like, a few ohms I would guess?

And FWIW, R2 is superfluous because SPICE voltage sources are ideal*.

*LTSpice hides ESR and ESL parameters inside components, so beware if they've been set nonzero by default.

Tim

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