STEP_SERVO_CONTROL

Published:2009/7/21 1:16:00 Author:Jessie | From:SeekIC

Variable UJT oscillator generates train of pulses under control of digital input logic levels, at 1000 pulses per second for logic 1 or 4400 pulses per second for logic 0, with smooth transitions between rates when logic changes, for driving stepping servomotor. Q1 and Q2 are constant-current sources. JFET Q3 acts as voltage-controlled variable resistor in parallel with R10, controlling pulse rate of UJT oscillator Q4.-C.R.Forbes.Step-Servo Motor Slew Generator. EEE Magazine.Oct.1970,p76-77.



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