| 摘要 |
PURPOSE: To reduce power consumption while decreasing the number of external components by providing a switching transistor having collector or emitter connected with the terminal of a resistance bridge circuit connected with a DC motor thereby shortening the switching interval of the switching transistor. CONSTITUTION: A switching circuit is provided on the power supply side while being integrated in an IC 100 and a motor 1 is connected between a motor connection terminal 14 and a resistor R4 constituting a bridge. A switching transistor Q2 is integrated in the IC 100 with the emitter and collector being connected, respectively, with a power supply input terminal 15 and the terminal 14. In the control circuit, the motor 1 is connected in series with the collector of the PNP switching transistor Q2 and power is fed to the motor 1. A coil built in the motor 1 serves as a smoothing coil thus eliminating the need of smoothing coil or external smoothing capacitor. |
