| 摘要 |
<p>A circuit branch (3) comprises a Wheatstone bridge (4) connected in series with the switch (S1), the bridge comprising two parallel branches (5a, 5b) each having a midpoint (6a, 6b), one of these midpoints being connected to a control pin (9). A sensor (7) is used to detect when the bridge is out of balance and actuates a control device (8) for turning the indicator (1) on and off. The circuit has a power voltage applied between two reference lines (2a, 2b), between which is a circuit branch including the switch. The control pin is used to provide a connection with a control circuit including a controllable switch component. An independent claim is also included for a system for driving six indicators, comprising six of these circuits, in which the first reference lines are common to all six circuits and can be connected with a first wire, the second reference lines are also common to all the circuits and can be connected with a second wire, and the control pins in each of these circuits can be connected with a wire.</p> |
