The series resistor R1 sets the operating current (and hence the brightness level) of IRED1. The infrared receiver IR1 is only sensitive to light modulated with a specific (38kHz) ... 0 comments on “ ...

For dc and ac measurement, DT series current transducers use closed-loop compensated sensing with fixed excitation frequency and second harmonic zero flux detection for “better than 2 ppm” linearity, ...