Tread into electrical engineering feedback control system 1)Basic request and hint(difficulty coefficient 1.0) The exploitation makes use of 8255 output a pulse sequence, the control BA, BB, BC, BD pulse, after enlarging, drive a small scaled step to enter electrical engineering, attain to make The electrical engineering settles to soon revolve of purpose..Control process to adopt to open wreath with shut the wreath two kinds of method realizations: (1)Press appointed speed control output the realization open wreath to turn soon variety (2)Press appointed speed control output the realization shut wreath to turn soon variety, shut a wreath control to increase or decrease exportation according to the deviation(fix value or with deviation become comparison, type Regulate at the integral calculus) 《The tiny machine tests and the course design 》test instruction book 62 (3)The speed parameter can choose modify(adjust) while passing the variable electric potential machine on the ex

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