| 摘要 |
<p>Circuitry operating from a uni-polar power supply having an error amplifier and a controller amplifier is arranged to modify a process variable signal and a set point signal and produce an output signal which is applied to a load element for controlling a process. The error amplifier applies the process variable signal and the difference between the process variable signal and the set point signal to the controller amplifier. A manually operated signal generator selectively provides a control signal for effecting a predetermined variation in the output signal.</p> |
