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Trainer board is a modelling device approach which has related function or same with real pheneonom, it was designed for upgrading the cognitive and the psychomotoric ability of students in a practical courses understanding and applicating concepts. This research goals is to make a trainer board of Astable Multivibrator oscillator, we hope that this learning tools can help them in facilitate to learn Astable Multivibrator characteristics as well as laboratories insfrastructure need. The method in design and implement this trainer board is prototyping and assembling with several approach steps, i.e. identification; simulation; experiment, design process; fabrication; and finally is testing. The results show that the trainer board which designed is appropriate with the theorem.