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朴珍敎 군산대학교 1977 群山水産專門大學 硏究報告 Vol.11 No.2
Recently we have introduced automatic control into the operating system in order to raise the productive efficiency by producing uniformed goods and to reduce the cost of manpower. Thereby reliability is deemed to be very important. Lots of research has been given to the timer employing various elements of semiconductor, and the timer is now being employed widely in many spheres. This paper deal with the timer for photo-magnifying machine necessary to the process of photographicprint; especially the circuit appling the operating principle of UJT and SCR. And the timer has the following merits : 1) Extensive control over the operating time is possible and a comparative accurate time can be obtained, and so by controlling the value of resistance and condenser for time control, adequate photo-sensitive effect appears on the print-paper. 2) This timer plays a role of two timers because it can control the delayed time automatically. 3) Anyone can operate this timer with ease. 4) the circuit is relatively simple and the production cost is low-priced.