| 摘要 |
PURPOSE:To obtain a switch circuit with simple structure and ease of operation by providing plural switches between conductors connected both poles of a power supply and providing a means identifying the closing of said switch. CONSTITUTION:Plural switches S1-S3 are provided between a couple of conductors 2 and 3 connected to both poles of the power supply 1 and prolonged in parallel at an equal interval. Since the conductors 2, 3 themselves have the specific resistance value, a potential difference produced in a circuit closed by closing the switch S1 and a circuit closed by closing the switch S2 is different. In inserting a voltmeter in the conductor 2, the reading of the meter 4 corresponding to the closed switches S1-S4 is different. Since a closed switch is identified by a position of a pointer of the meter 4 in this way, an output signal in response to the activated switch is obtained by using, e.g., an A/D converter in place of the meter 4. Thus, the switch circuit with simple structure and ease of operation is attained. |
