1. A transient resistant output stage comprising: amplifier circuitry including an input, an output, an output device, a bias input, and a control input, the output device being coupled to the output, the output device being operable to generate an electrical output signal at the output, the amplifier circuitry being intended to respond to an input electrical signal received at the input by generating the electrical output signal, the amplifier circuitry powered at least in part by a power supply received at the bias input, wherein a first control signal received at the control input enables the output device and a second control signal received at the control input disables the output device; and a bias sensor having a sensing input and a control output, the sensing input coupled to the power supply, the control output electrically coupled to the control input of the amplifier circuitry, the bias sensor operable to sense the power supply and determine whether the power supply is valid, the bias sensor further operable to generate the first signal at the control output in response to a valid power supply and the second signal at the control output in response to an invalid power supply.