| 摘要 |
A step zooming circuit for a video camera comprises a key recognition section (10) to detect the state of switches (S1,S2) and a push button switch (P1), a pulse generation/control section (20) to provide the control signal to a motor driver (30), a motor driver to drive a motor, and a motor rotation speed control section (40) having FETs (Q1,Q2) connected with Zenner diodes (ZD1,ZD2) and for controlling the motor rotation speed.
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