CLOCKWISE OR COUNT CLOCKWISE TRANSFER CONTROL CIRCUIT OF DRUM AT SEARCH

摘要

The control circuit of providing precision tracking comprises the counter (1) counting the pulses of the drum motor in a period; a modulator (3) modulating the comparative output of the reference signal and the counter output signal; a lowpass filter (4) producing DC voltage; a detector (5) detecting the synchronous loop phase; a microprocessor (6) designing the stable state and unstable state; a solenoid (12) controlling the direction of the drum motor.