FIELD: sound recording and reproducing devices. SUBSTANCE: D.C. drive has tachometer bridge whose arms are built up of resistive voltage divider and series-connected electric motor and resistor. Amplifier is connected across two opposite terminals of bridge and to regulating transistor base. Amplifier has reference voltage source, triggering diode, and two inversely connected transistor to ensure appropriate order of their turning-on. EFFECT: improved reliability of motor starting at any combination of bridge circuit parameters. 1 dwg
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