| 摘要 |
1,081,735. Transistor pulse circuits. CANADIAN WESTINGHOUSE CO. Ltd. Nov. 8, 1965 [April 17, 1965], No. 47186/65. Heading H3T. [Also in Divisions G1 and H2] A photo-electric line follower comprises capacitors 39 and 40 which are periodically charged through transistors 41, 42 rendered conductive by a pulsating D.C. signal from transistor 45. In between chargings, the capacitors are discharged by the outputs of the balanced D.C. amplifier 36, 37 at rates proportional to the illumination of the phototransistors. When the voltage on the capacitors has fallen to a preset level, the unijunction transistors 56, 57 conduct and trigger the siliconcontrolled rectifiers 66, 67. D.C. is thereby fed to a steering motor during the period after the first S.C.R. has struck and before the other strikes. If the phototransistors are equally illuminated the S.C.Rs. strike together and the motor remains de-energized, but any difference in illumination results in the motor being energized to rotate the phototransistors in a sense tending to equalize the illumination. |
