FIELD: reading magnetic and mechanical records. SUBSTANCE: method involves sending signal of combined motor-generating unit into negative-feedback amplifier and sending some of output amplifier signal into receiver. Goal of invention is achieved by application of output signal of amplifier to signal of combined motor-generating unit by means of dynamic positive feedback circuit, which is also added to amplifier. EFFECT: increased dynamic range, decreased wear of combined motor-generating unit. 3 dwg
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