Published:2011/6/19 19:34:00 Author:TaoXi | Keyword: Stepping type, servo, control circuit | From:SeekIC
The stepping type servo control circuit is as shown in the figure, this circuit uses the changeable unijunction transistor (UJT) oscillator, in the control of the digital level, this oscillator produces the pulse sequence. When the logic level is 1, the oscillator produces 1000 pulses per second; when the logic level is 0, the oscillator produces 4400 pulses per second. When the logic level changes, the transition between the two pulse rate is smooth. The pulse sequence is used to start the stepping type servo motor. Q1 and Q2 are two constant current source, Q3 can be used as the voltage control resistance, it is in the parallel connection with R10 to control the pulse speed of the unijunction transistor (UJT) oscillator.
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