| 摘要 |
PURPOSE:To put out unnecesary lamps while the value of a counter is changed, by detecting the closing of a switch determining the value of the counter and interrupting a current flowing to a lamp corresponding to the switch. CONSTITUTION:When a switch 4-i (i=1-n) is closed, a counter 2 selects a D1 terminal of a decoder 3 and ''0'' is inputted to an inverter 7 from a decoder 3. Thus, an outout goes to ''1'', an LED5 is cutoff and distinguished. On the other hand, ''1'' is inputted to one input of an AMD circuit 8 from the inverter 7, a clock from a terminal 9 is outputted to the counter 2, the output of the counter 2 is changed and delivered to the decoder 3, the output goes to ''1'' and is given to the inverter 7 via the switch 4-i. Thus, the output of the inverter 7 goes to ''0'', the counter 2 does not input clocks, and a current flows from the decoder 3 via a resistor 6-i and an LED 5-i for relighting. |
