I have a very simple circuit with two op-amps which is latching up, as described below. I suspect that one of the IC's is simply defective.
Don't worry about the implied circuit continuation to the right; not all the parts are installed so that is not connected. Likewise, no input source is connected.
The power supply is +/- 15V. The op-amps IC's are NE5532. The expected behavior is that a maximum of 1000 nA of input bias current flows from through both + inputs across R1, resulting in a voltage of up to 50 mV across R1. That is tolerable in this application, which is why I don't have any additional resistors to try to to compensate for input bias current.
What actually happens is that somehow enough current flows out of the + inputs to drop -15V across R1, sticking both + inputs to the negative power rail. (This is beyond the common mode voltage range given on the datasheet). The output cannot swing that far; it only goes to -14, so a differential voltage of 1V develops. This is enough to forward-bias the back-to-back protective diodes which connect the inputs, a feature of the NE5532. Both IC's run fairly hot.
Have I done something that these op-amps don't like, or do I have a defective part?