| 摘要 |
A circuit for supplying current to a load connected to a pair of output leaves of the circuit has at least one feed circuit, an electronic switch disposed between the feed circuit and the leaves having a transistor with a control electrode and a controlled path, and a control means for operating the electronic switch to disconnect the feed circuit from at least one of the leads when the feed circuit de-energized and to connect the feed circuit to at least one of the leads when the feed circuit is energized. The control means has a further transistor with a controlled path connected in series with the control electrode of the transistor in the electronic switch, and a control electrode connected to the controlled path of the transistor in the electronic switch. The control means further has a resistor connected between the control electrode of the further transistor and one of the load leads.
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