| 摘要 |
The circuitry is used in indication devices and devices for visual information. It is compatible with well known circuits for lever indication and it improves the visual clarity of the indication. The circuit contains N single-type units with N+1 inputs, and each unit is connected to the input of the following one and contains two-colour LED (1). The green LED is connected to the emitter of transistor (2), and the red - to the emitter of a second transistor (3). The common cathode is connected to frame. The collector of another transistor (4) is connected across resistor (5) to the plus sign of the supply and across a resistor (6) - to the base of transistor (2). The collectors of transistors (2 & 3) are connected across resistors (7 & 8), respectively, to the plus sign of the supply. The input of a given unit is connected across resistor (9) to the base of transistor (4) and to one of the inputs of the SWITCH OFF OR gate (10). The other input of the gate (10) is connected to the input of the succeeding unit and across resistor (11) - to the base of transistor (3). The output of the logical element (10) is connected across resistors (12) 13) and diodes (14 & 15), respectively, to the bases of bases of transistors (2 & 3). (11) 110
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