| 摘要 |
Timers for controlling load circuits, such as motors in motor-driven cameras, have ON and OFF intervals which can either be continuously repeated or automatically interrupted after various selected sequences of ON-OFF operations for thereafter holding the load circuit in an energized or de-energized state. The timers comprise a bi-stable circuit having complementary output signals and a pair of CR time-delay circuits for generating time-delayed signals in response to the output signals, the time-delayed signals being coupled to respective inputs of the bi-stable circuit for causing the bi-stable circuit to be alternately set in first and second states. A load responsive to one of the output signals is energized or de-energized in accordance with the state of the bi-stable circuit. An interrupter circuit responsive to one of the time-delayed signals causes the load to be continuously energized or de-energized after a selected ON-OFF sequence.
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