| 摘要 |
A bi-directional motor drive circuit has a single input terminal and first and second terminals having a reversible DC electric motor connected therebetween. Also, the circuit is provided with third and fourth terminals for connection to voltage sources of unequal positive potential such that the voltage supplied to the third terminal is at higher potential than that supplied to the fourth terminal. Further, the fourth terminal is connected to the second terminal. The circuit splits into first and second branches. The first branch includes a first NPN transistor and a second PNP transistor. The second branch includes third and fourth NPN transistors. The respective transistors of each of the branches are so arranged with one another and with respect to the input, voltage supply and motor-connected terminals such that upon application of a "high" level signal to the input terminal of the circuit the motor is driven in a first direction, while upon application of a "low" level signal to the input terminal of the circuit the motor is driven in a second, opposite direction.
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