It was a valued export in Silk Road trading, but the manufacturing process was kept secret. During the Tang Dynasty (618-907) and the Song Dynasty (960-1279), varieties of paper were developed for different purposes.
April 7, 2015 Written by controlguru. Like the P-Only controller, the Proportional-Integral (PI) algorithm computes and transmits a controller output (CO) signal every sample time, T, to the final control element (e.g., valve, variable speed pump).
The DAC output is one input to a comparator, with the other being the analog signal to be digitized. This input signal is usually pre-conditioned by a sample-and-hold (also called a track/store) amplifier. The S/H amp contains a switch and a capacitor that continuously charges/discharges to the input voltage.