PRF_MULTIPLIER

Published:2009/7/23 22:55:00 Author:Jessie | From:SeekIC

Multiplies pulse repetition frequency of ultrasonic receiver by factor of either 4 or 8, into range between 35 and 85 cps at which synchronous motors of indicalor system work best, Multiplication is based on controlled mvbr oscillator V1, whose frequency can be varied from 40 to 180 cps by varying control voltage Vc. Multiplier feedback circuit acts to control this voltage so mvbr frequency is exact multiple, 8 or 16, of input pulse rate.-H. F. Messias, Ultrasonics Measures Flow Velocity of Rivers, Electronics, 34:41, p 56-69.



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