| 摘要 |
PURPOSE:To reduce the number of selected leads to simplify a circuit by arranging circuits, which are obtained by connecting non-polarized constant-voltage elements in series to magnetism holding-type relays, in a matrix. CONSTITUTION:In a 3X3 matrix constitution of magnetism holding relays SO to S8 and Zener diodes ZDOO to O8 and ZD10 to 18 which are connected in series to these relays respectively, when relay SO is operated, contacts xO and yO are closed to operate the relay by the current from a negative power source; and when the relay is released, contact trf is switched to release the relay by the current which is caused to pass through R from a positive power source. At this time, -EV(+EV R) xO S1 ZDO1 ZD11 ZD14 ZDO4 S4 S3 ZDO3 ZD13 yO earth is possible as circulation, and the current passes always through Zener diodes ZD in this route. However, three of them have a forward direction, so that the current may be prevented from flowing to this route to prevent malfunction by setting the sum of breakdown voltages over EV in respect to three residual ZD. |
