| 摘要 |
PURPOSE:To simplify the change-over of timer operation and a set time by a min. signal even in the case of manipulation due to remote control, by mounting a change-over circuit wherein the operation of a timer circuit is started by a first input signal and the set time of the timer circuit is changed over by the input signal on and after the second one. CONSTITUTION:During the timer operation of a set time NT2, because the output voltage (c) of a transistor 19 is a high level and the output voltage (f) of a flip-flop 20 is also a high level, the transistor 26 of a display circuit 21 comes to an ON state and a light emitting diode 28 is lighted to display such a state that the timer of NT2 is under operation. When a third pulse signal for timer-on. time change-over is again issued before NT2 is elapsed, timer operation is once also switched to NT1 and the timer operation is again started. When timer output (h) is generated after a predetermined time, a relay is changed over while a contact is switched off and the supply of a power source to a television receiver circuit is switched off while a power source to a timer apparatus is blocked to complete timer operation. |
