| 摘要 |
<p>An apparatus comprising an electrical device (1) having a first connection terminal (1a), a second connection terminal (1b) and a holder (3) for holding a voltage source (4) having two voltage-source terminals (4a, 4b). The holder has a first contact (3a), a second contact (3b) and a third contact (3c) for cooperation with the voltage-source terminals. Via these contacts, the first connection terminal is connectable to one voltage-source terminal (4a) and the second connection terminal is connectable to the other voltage-source terminal (4b). The holder is adapted to allow the first contact, the second contact and the third contact to engage simultaneously with the voltage-source terminals. When the voltage source is present, the first contact and one of the two other contacts are in engagement with one of the voltage-source terminals, and the other contact, which is not in engagement with the first voltage-source terminal, is in engagement with the second voltage-source terminal. The first contact is connected to the first connection terminal of the electrical device and the second contact and the third contact are connected to, respectively, a first input (5a) and a second input (5b) of a FET circuit (5). The FET circuit has an output (5c) connected to the second connection terminal of the electrical device.</p> |
