Abstract: Circuitry that is used to determine the strain of a component and includes a waveform random access memory that stores excitation digital data that represent values of an excitation waveform, a digital-to-analog converter to convert the digital data to an analog excitation signal, a strain sensing transducer that receives the excitation signal and generates an analog response signal, an analog-to-digital converter that digitizes the transducer response signal, a demodulator that multiplies the digital response signal times phase adjusted values of the excitation digital data stored in the waveform memory and low-pass filters the digital response signal, and a resistance-to-voltage converter connected to present a voltage indicating the resistance of an identifying resistor to the analog-to-digital converter.