TAPE_LOOP_SPEED_CONTROL

Published:2009/7/7 0:01:00 Author:May | From:SeekIC

Shunt rectifier-capacitor circuit was developed for speed control of permanent split-capacitor fractional-horsepower induction motor used in some motion-picture projectors. Light-dependent resistor UDR makes Q2 conduct when light from lamp is not blocked by tape loop. Split capacitor C1 for motor provides both run and speed-control functions without switching. Values are: C2 0.01μF; D 1N4004; Q1 2N4987; Q2 C106B; R1 330K; R2 100; R3 10.-T. A. Gross, Control the Speed of Small Induction Motors, EDN Magazine, Aug. 20, 1977, p 141-142.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/TAPE_LOOP_SPEED_CONTROL.html

Print this Page | Comments | Reading(3)