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In order to maximize the efficiency of teaching methods, a simple instructional machine was developed in the Department of Electrical Engineering at the Chiba University. This machine has a feedback system, is easy to program and operate, and is capable of testing students. As a test case, this method was applied to an experiment in multivibrators for third year undergraduate students. An increase in student results was obtained, in addition to a saving of the instructor's time once the initial program had been developed. This paper will also describe several other advantages of the machine, including its relatively low cost.