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The radio constructor "Start-7217" (Generator of erasing and magnetising a tape recorder) since 1988 was produced by the Kamenets-Podolsk plant "Elektropribor". The radio constructor '' Start-7217 '' is intended for children of senior school age and radio amateurs of any qualification. The proposed radio designer allows you to assemble a generator that produces a current of erasing and magnetic bias for a magnetic tape during recording. The generator can be used in the manufacture and modernization of tape recorders of various classes. At the same time, if the tape drive mechanism allows for the tape recorder, parameters not worse than 1st class are achieved. The frequency of the current erase and bias 100 kHz. Erase current 100 mA. Harmonic factor 0.5%. Supply voltage (bipolar source) 12 V. Current consumption 35 mA. The dimensions of the board are 130x80x40 mm. Weight 120 g