Switching drive circuit

Details Switching drive circuit Switching drive circuit

1980-08-15

1983-03-22

Weldon, Ulysses

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Running-speed control

318 51, 318 7, H02P 546

Patent

active

043777775

ABSTRACT:
Two DC motors are driven by switching pulse drive circuits, and the switching on times of drive pulses are made to be out of phase with each other at the two switching pulse drive circuits. One of the two DC motors rotates rotary video heads, and the other drives a capstan of a video tape recording and/or reproducing apparatus. The drive pulses are preferably synchronized with horizontal synchronizing pulses of a video signal to be handled by the video tape recording and/or reproducing apparatus in order to avoid pulse noises.

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patent: 4146827 (1979-03-01), Krohn
patent: 4150324 (1979-04-01), Naito
patent: 4160195 (1979-07-01), Sakamoto
patent: 4278925 (1981-07-01), Minakuchi

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